<SEC-DOCUMENT>0001193125-23-000866.txt : 20230103
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<ACCEPTANCE-DATETIME>20230103171520
ACCESSION NUMBER:		0001193125-23-000866
CONFORMED SUBMISSION TYPE:	424B3
PUBLIC DOCUMENT COUNT:		12
FILED AS OF DATE:		20230103
DATE AS OF CHANGE:		20230103

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BLACKROCK CORPORATE HIGH YIELD FUND, INC.
		CENTRAL INDEX KEY:			0001222401
		IRS NUMBER:				000000000

	FILING VALUES:
		FORM TYPE:		424B3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-262469
		FILM NUMBER:		23503206

	BUSINESS ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809
		BUSINESS PHONE:		800-441-7762

	MAIL ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BLACKROCK CORPORATE HIGH YIELD FUND VI, INC.
		DATE OF NAME CHANGE:	20120920

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BLACKROCK CORPORATE HIGH YIELD FUND VI INC
		DATE OF NAME CHANGE:	20061018

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CORPORATE HIGH YIELD FUND VI INC
		DATE OF NAME CHANGE:	20030917

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BLACKROCK DEBT STRATEGIES FUND, INC.
		CENTRAL INDEX KEY:			0001051003
		IRS NUMBER:				223564108
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		424B3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-267429
		FILM NUMBER:		23503207

	BUSINESS ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809
		BUSINESS PHONE:		800-441-7762

	MAIL ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BLACKROCK DEBT STRATEGIES FUND
		DATE OF NAME CHANGE:	20070611

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	DEBT STRATEGIES FUND
		DATE OF NAME CHANGE:	20030428

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	DEBT STRATEGIES FUND II INC
		DATE OF NAME CHANGE:	19971208

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BLACKROCK MUNICIPAL INCOME TRUST II
		CENTRAL INDEX KEY:			0001176194
		IRS NUMBER:				010722216
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0831

	FILING VALUES:
		FORM TYPE:		424B3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-261023
		FILM NUMBER:		23503210

	BUSINESS ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809
		BUSINESS PHONE:		888-441-7762

	MAIL ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BlackRock Science & Technology Trust
		CENTRAL INDEX KEY:			0001616678
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		424B3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-264682
		FILM NUMBER:		23503209

	BUSINESS ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809
		BUSINESS PHONE:		302-797-2000

	MAIL ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BlackRock Health Sciences Trust
		CENTRAL INDEX KEY:			0001314966
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE

	FILING VALUES:
		FORM TYPE:		424B3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-263527
		FILM NUMBER:		23503214

	BUSINESS ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809
		BUSINESS PHONE:		(888) 825-2257

	MAIL ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BlackRock Utilities, Infrastructure & Power Opportunities Trust
		CENTRAL INDEX KEY:			0001528988
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1031

	FILING VALUES:
		FORM TYPE:		424B3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-262272
		FILM NUMBER:		23503208

	BUSINESS ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809-3700
		BUSINESS PHONE:		(800) 882-0052

	MAIL ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809-3700

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BlackRock Utility & Infrastructure Trust
		DATE OF NAME CHANGE:	20110830

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BlackRock Multi-Sector Income Trust
		CENTRAL INDEX KEY:			0001562818
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		424B3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-262119
		FILM NUMBER:		23503211

	BUSINESS ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809-3700
		BUSINESS PHONE:		800-882-0052

	MAIL ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809-3700

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BlackRock Fixed Income Strategic Opportunities
		DATE OF NAME CHANGE:	20121126

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BLACKROCK INCOME TRUST, INC.
		CENTRAL INDEX KEY:			0000832327
		IRS NUMBER:				133463349
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1031

	FILING VALUES:
		FORM TYPE:		424B3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-262743
		FILM NUMBER:		23503213

	BUSINESS ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		STREET 2:		MUTUAL FUND DEPARTMENT
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809
		BUSINESS PHONE:		888-825-2257

	MAIL ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		STREET 2:		MUTUAL FUND DEPARTMENT
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BLACKROCK INCOME TRUST INC.
		DATE OF NAME CHANGE:	20121009

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BLACKROCK INCOME TRUST INC
		DATE OF NAME CHANGE:	19930309

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BLACKSTONE INCOME TRUST INC
		DATE OF NAME CHANGE:	19920703

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BLACKROCK Ltd DURATION INCOME TRUST
		CENTRAL INDEX KEY:			0001233681
		IRS NUMBER:				200096695
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1031

	FILING VALUES:
		FORM TYPE:		424B3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-262366
		FILM NUMBER:		23503212

	BUSINESS ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		STREET 2:		MUTUAL FUND DEPARTMENT
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809
		BUSINESS PHONE:		888-825-227

	MAIL ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		STREET 2:		MUTUAL FUND DEPARTMENT
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BLACKROCK LTD DURATION INCOME TRUST
		DATE OF NAME CHANGE:	20041103

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BLACKROCK LIMITED DURATION INCOME TRUST
		DATE OF NAME CHANGE:	20030611

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BLACKROCK MANAGED DURATION INCOME TRUST
		DATE OF NAME CHANGE:	20030529
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Roman;font-weight:bold;text-align:center"><ix:nonNumeric name="dei:EntityRegistrantName" contextRef="P01_03_2023To01_03_2023">BLACKROCK CORPORATE HIGH YIELD FUND, INC.</ix:nonNumeric> (HYT) </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold;text-align:center">BLACKROCK CREDIT STRATEGIES FUND (CREDX) </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold;text-align:center"><ix:nonNumeric name="dei:EntityRegistrantName" contextRef="P01_03_2023To01_03_2023_BlackrockDebtStrategiesFundIncMembercefSecurityAxis">BLACKROCK DEBT STRATEGIES FUND, INC.</ix:nonNumeric> (DSU) </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold;text-align:center"><ix:nonNumeric name="dei:EntityRegistrantName" contextRef="P01_03_2023To01_03_2023_BlackrockHealthSciencesTrustMembercefSecurityAxis">BLACKROCK HEALTH SCIENCES TRUST</ix:nonNumeric> (BME) </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold;text-align:center"><div style="display:inline;">BLACKROCK HEDGE FUND GUIDED PORTFOLIO SOLUTION</div> (GPS) </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold;text-align:center"><ix:nonNumeric name="dei:EntityRegistrantName" contextRef="P01_03_2023To01_03_2023_BlackrockIncomeTrustIncMembercefSecurityAxis">BLACKROCK INCOME TRUST, INC.</ix:nonNumeric> (BKT) </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold;text-align:center"><ix:nonNumeric name="dei:EntityRegistrantName" contextRef="P01_03_2023To01_03_2023_BlackrockLimitedDurationIncomeTrustMembercefSecurityAxis">BLACKROCK LIMITED DURATION INCOME TRUST</ix:nonNumeric> (BLW) </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold;text-align:center"><ix:nonNumeric name="dei:EntityRegistrantName" contextRef="P01_03_2023To01_03_2023_BlackrockMultisectorIncomeTrustMembercefSecurityAxis">BLACKROCK MULTI-SECTOR INCOME TRUST</ix:nonNumeric> (BIT) </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold;text-align:center"><ix:nonNumeric name="dei:EntityRegistrantName" contextRef="P01_03_2023To01_03_2023_BlackrockMunicipalIncomeTrustIiMembercefSecurityAxis">BLACKROCK MUNICIPAL INCOME TRUST II</ix:nonNumeric> (BLE) </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold;text-align:center"><ix:nonNumeric name="dei:EntityRegistrantName" contextRef="P01_03_2023To01_03_2023_BlackrockScienceAndTechnologyTrustMembercefSecurityAxis">BLACKROCK SCIENCE AND TECHNOLOGY TRUST</ix:nonNumeric> (BST) </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold;text-align:center"><ix:nonNumeric name="dei:EntityRegistrantName" contextRef="P01_03_2023To01_03_2023_BlackrockUtilitiesInfrastructurePowerOpportunitiesTrustMembercefSecurityAxis">BLACKROCK UTILITIES, INFRASTRUCTURE &amp; POWER OPPORTUNITIES TRUST</ix:nonNumeric> (BUI) </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold;text-align:center">(each, a &#8220;Fund&#8221; and collectively, the &#8220;Funds&#8221;) </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold;text-align:center">Supplement dated January&#160;3, 2022 to the Prospectus of each Fund set out in Appendix A </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">This supplement amends certain information in the Prospectus of each Fund set out in Appendix A. Unless otherwise indicated, all information included in the Prospectus that is not inconsistent with the information set forth in this supplement remains unchanged. Capitalized terms not otherwise defined in this supplement have the same meanings as in the Prospectus. </div><ix:nonNumeric name="cef:InvestmentObjectivesAndPracticesTextBlock" contextRef="P01_03_2023To01_03_2023" escape="true" continuedAt="TextSelection_62624647"><ix:nonNumeric name="cef:InvestmentObjectivesAndPracticesTextBlock" contextRef="P01_03_2023To01_03_2023_BlackrockDebtStrategiesFundIncMembercefSecurityAxis" escape="true" continuedAt="TextSelection_62629427"><ix:nonNumeric name="cef:InvestmentObjectivesAndPracticesTextBlock" contextRef="P01_03_2023To01_03_2023_BlackrockIncomeTrustIncMembercefSecurityAxis" escape="true" continuedAt="TextSelection_62629428"><ix:nonNumeric name="cef:InvestmentObjectivesAndPracticesTextBlock" contextRef="P01_03_2023To01_03_2023_BlackrockLimitedDurationIncomeTrustMembercefSecurityAxis" escape="true" continuedAt="TextSelection_62630529"><ix:nonNumeric name="cef:InvestmentObjectivesAndPracticesTextBlock" contextRef="P01_03_2023To01_03_2023_BlackrockMultisectorIncomeTrustMembercefSecurityAxis" escape="true" continuedAt="TextSelection_62630531"><ix:nonNumeric name="cef:InvestmentObjectivesAndPracticesTextBlock" contextRef="P01_03_2023To01_03_2023_BlackrockMunicipalIncomeTrustIiMembercefSecurityAxis" escape="true" continuedAt="TextSelection_62630536"><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">The following changes are made to each Fund&#8217;s Prospectus, as applicable: </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">With respect to HYT, CREDX, DSU, BKT, BLW, BIT and BLE, the section entitled &#8220;The Fund&#8217;s Investments &#8211; Portfolio Contents and Techniques &#8211; Securities Lending,&#8221; &#8220;The Trust&#8217;s Investments &#8211; Portfolio Contents and Techniques &#8211; Securities Lending&#8221; or &#8220;The Trust&#8217;s Investments &#8211; Lending of Securities,&#8221; as applicable, is hereby deleted in its entirety and replaced with the following, and with respect to GPS, the following is added to the section entitled &#8220;Investment Strategies&#8221;: </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"><div style="font-weight:bold;display:inline;"><div style="font-style:italic;display:inline;">Securities Lending</div></div>. The Fund may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities loan will be made on behalf of the Fund if, as a result, the aggregate value of all securities loans of the Fund <div style="white-space:nowrap;display:inline;">exceeds&#160;one-third&#160;of</div> the value of the Fund&#8217;s total assets (including the value of the collateral received). The Fund may terminate a loan at any time and obtain the return of the securities loaned. The Fund receives the value of any interest or cash <div style="white-space:nowrap;display:inline;">or&#160;non-cash&#160;distributions</div> paid on the loaned securities. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Fund is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Fund is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Fund for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Fund conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Fund and to retain an affiliate of the Fund as lending agent. To the extent that the Fund engages in securities lending, BlackRock Investment Management, LLC (&#8220;BIM&#8221;), an affiliate of the Advisor, acts as securities lending agent for the Fund, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">To the extent the Fund engages in securities lending, the Fund retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Fund is responsible for expenses in connection with the investment of cash collateral received for securities on </div></ix:nonNumeric> </ix:nonNumeric> </ix:nonNumeric> </ix:nonNumeric> </ix:nonNumeric> </ix:nonNumeric> <div style="margin-top:1em; margin-bottom:0em; page-break-before:always"></div><hr style="color:#999999;height:3px;width:100%"/><ix:continuation id="TextSelection_62624647"><ix:continuation id="TextSelection_62629427"><ix:continuation id="TextSelection_62630529"><ix:continuation id="TextSelection_62629428"><ix:continuation id="TextSelection_62630531"><ix:continuation id="TextSelection_62630536"><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">loan (the &#8220;collateral investment expenses&#8221;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Fund. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#8217;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#8217;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Fund would be subject to any such liquidity fee or redemption gate imposed. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Under the securities lending program, the Fund is categorized into a specific asset class. The determination of the Fund&#8217;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Fund and BIM. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Pursuant to the current securities lending agreement: (i)&#160;if the Fund were to engage in securities lending, the Fund retains 82% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Fund, pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i)&#160;if the Fund were to engage in securities lending, 85% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div></ix:continuation></ix:continuation></ix:continuation></ix:continuation></ix:continuation></ix:continuation><ix:nonNumeric name="cef:InvestmentObjectivesAndPracticesTextBlock" contextRef="P01_03_2023To01_03_2023_BlackrockHealthSciencesTrustMembercefSecurityAxis" escape="true" continuedAt="TextSelection_62630542"><ix:nonNumeric name="cef:InvestmentObjectivesAndPracticesTextBlock" contextRef="P01_03_2023To01_03_2023_BlackrockScienceAndTechnologyTrustMembercefSecurityAxis" escape="true" continuedAt="TextSelection_62631898"><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">With respect to BME and BST, the section entitled &#8220;The Trust&#8217;s Investments &#8211; Portfolio Contents and Techniques &#8211; Securities Lending&#8221; is hereby deleted in its entirety and replaced with the following: </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"><div style="font-weight:bold;display:inline;"><div style="font-style:italic;display:inline;">Securities Lending</div></div>. The Trust may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities loan will be made on behalf of the Trust if, as a result, the aggregate value of all securities loans of the Trust <div style="white-space:nowrap;display:inline;">exceeds&#160;one-third&#160;of</div> the value of the Trust&#8217;s total assets (including the value of the collateral received). The Trust may terminate a loan at any time and obtain the return of the securities loaned. The Trust receives the value of any interest or cash <div style="white-space:nowrap;display:inline;">or&#160;non-cash&#160;distributions</div> paid on the loaned securities. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Trust is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Trust is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Trust for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. </div><div style="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&#160;</div></ix:nonNumeric></ix:nonNumeric><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;text-align:center">-&#160;2&#160;- </div><div style="margin-top:1em; margin-bottom:0em; page-break-before:always"></div><hr style="color:#999999;height:3px;width:100%"/><ix:continuation id="TextSelection_62631898" continuedAt="TextSelectionAppend_62631898_1"><ix:continuation id="TextSelection_62630542" continuedAt="TextSelectionAppend_62630542_1"><div style="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Trust conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Trust and to retain an affiliate of the Trust as lending agent. To the extent that the Trust engages in securities lending, BlackRock Investment Management, LLC (&#8220;BIM&#8221;), an affiliate of the Advisor, acts as securities lending agent for the Trust, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. </div></ix:continuation></ix:continuation></div></div> <div><div style="background-color:white;display: inline;"><ix:continuation id="TextSelectionAppend_62630542_1"><ix:continuation id="TextSelectionAppend_62631898_1"><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Trust retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Trust is responsible for expenses in connection with the investment of cash collateral received for securities on loan (the &#8220;collateral investment expenses&#8221;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Trust. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#8217;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#8217;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Trust would be subject to any such liquidity fee or redemption gate imposed. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Under the securities lending program, the Trust is categorized into a specific asset class. The determination of the Trust&#8217;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Trust and BIM. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Pursuant to the current securities lending agreement: (i)&#160;the Trust retains 81% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Trust, pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i) 81% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Prior to January&#160;1, 2023, the Trust was subject to a different securities lending fee arrangement. </div></ix:continuation></ix:continuation><ix:nonNumeric name="cef:InvestmentObjectivesAndPracticesTextBlock" contextRef="P01_03_2023To01_03_2023_BlackrockUtilitiesInfrastructurePowerOpportunitiesTrustMembercefSecurityAxis" escape="true" continuedAt="TextSelection_62631899"><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">With respect to BUI, the section entitled &#8220;The Trust&#8217;s Investments &#8211; Portfolio Contents and Techniques &#8211; Securities Lending&#8221; is hereby deleted in its entirety and replaced with the following: </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"><div style="font-weight:bold;display:inline;"><div style="font-style:italic;display:inline;">Securities Lending</div></div>. The Trust may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities </div></ix:nonNumeric> <div style="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&#160;</div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;text-align:center">-&#160;3&#160;- </div><div style="margin-top:1em; margin-bottom:0em; page-break-before:always"></div><hr style="color:#999999;height:3px;width:100%"/><ix:continuation id="TextSelection_62631899" continuedAt="TextSelectionAppend_62631899_1"><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">loan will be made on behalf of the Trust if, as a result, the aggregate value of all securities loans of the Trust <div style="white-space:nowrap;display:inline;">exceeds&#160;one-third&#160;of</div> the value of the Trust&#8217;s total assets (including the value of the collateral received). The Trust may terminate a loan at any time and obtain the return of the securities loaned. The Trust receives the value of any interest or cash <div style="white-space:nowrap;display:inline;">or&#160;non-cash&#160;distributions</div> paid on the loaned securities. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Trust is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Trust is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Trust for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Trust conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Trust and to retain an affiliate of the Trust as lending agent. To the extent that the Trust engages in securities lending, BlackRock Investment Management, LLC (&#8220;BIM&#8221;), an affiliate of the Advisor, acts as securities lending agent for the Trust, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Trust retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Trust is responsible for expenses in connection with the investment of cash collateral received for securities on loan (the &#8220;collateral investment expenses&#8221;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Trust. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#8217;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#8217;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Trust would be subject to any such liquidity fee or redemption gate imposed. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Under the securities lending program, the Trust is categorized into a specific asset class. 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Securities lending involves exposure to certain risks, including operational risk (i.e., the risk of losses resulting from problems in the settlement and accounting process), &#8220;gap&#8221; risk (i.e., the risk of a mismatch between the return on cash collateral reinvestments and the fees the Fund has agreed to pay a borrower), foreign exchange risk (i.e., the risk of a shortfall at default when a cash collateral investment is denominated in a currency other than the currency of the assets being loaned due to movements in foreign exchange rates), and credit, legal, counterparty and market risks. If a securities lending counterparty were to default, the Fund would be subject to the risk of a possible delay in receiving collateral or in recovering the loaned securities, or to a possible loss of rights in the collateral. In the event a borrower does not return the Fund&#8217;s securities as agreed, the Fund may experience losses if the proceeds received from liquidating the collateral do not at least equal the value of the loaned security at the time the collateral is liquidated, plus the transaction costs incurred in purchasing replacement securities. This event could trigger adverse tax consequences for the Fund. The Fund could lose money if its short-term investment of the collateral declines in value over the period of the loan. Substitute payments for dividends received by the Fund for securities loaned out by the Fund will generally not be considered qualified dividend income. The securities lending agent will take the tax effects on shareholders of this difference into account in connection with the Fund&#8217;s securities lending program. Substitute payments received on tax-exempt securities loaned out will generally not be tax-exempt income. </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold;text-align:center">Investors should retain this supplement for future reference. &#160;&#160;&#160;&#160; </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">PRO-GLOBAL11-0123SUP </div><div style="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&#160;</div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;text-align:center">-&#160;5&#160;- </div><div style="margin-top:1em; margin-bottom:0em; page-break-before:always"></div><hr style="color:#999999;height:3px;width:100%"/><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold;text-align:center">Appendix A </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">BlackRock Corporate High Yield Fund, Inc. </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Prospectus dated February&#160;2, 2022, as supplemented on July&#160;18, 2022 </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">BlackRock Credit Strategies Fund </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Prospectus dated April&#160;29, 2022, as supplemented on July&#160;18, 2022 </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">BlackRock Debt Strategies Fund, Inc. </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Prospectus dated December 28, 2022 </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">BlackRock Health Sciences Trust </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Prospectus dated April&#160;25, 2022, as supplemented on July&#160;18, 2022 </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">BlackRock Hedge Fund Guided Portfolio Solution </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Prospectus dated July 29, 2022 </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">BlackRock Income Trust, Inc. </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Prospectus dated October&#160;18, 2022 </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">BlackRock Limited Duration Income Trust </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Prospectus dated March&#160;22, 2022, as supplemented on July&#160;18, 2022 </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">BlackRock Multi-Sector Income Trust </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Prospectus dated March&#160;3, 2022, as supplemented on July&#160;18, 2022 </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">BlackRock Municipal Income Trust II </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Prospectus dated November&#160;12, 2021, as supplemented on July&#160;18, 2022 and September&#160;29, 2022 </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">BlackRock Science and Technology Trust </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Prospectus dated May&#160;4, 2022, as supplemented on July&#160;18, 2022 and September&#160;22, 2022 </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">BlackRock Utilities, Infrastructure&#160;&amp; Power Opportunities Trust </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Prospectus dated March&#160;4, 2022, as supplemented on July&#160;18, 2022 </div><div style="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&#160;</div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;text-align:center">-&#160;6&#160;- </div></div><div></div></div>
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<span style="display: none;">v3.22.4</span><table class="report" border="0" cellspacing="2" id="idm140000906515104">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>N-2<br></strong></div></th>
<th class="th"><div>Jan. 03, 2023</div></th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_CoverAbstract', window );"><strong>Cover [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0001222401<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_AmendmentFlag', window );">Amendment Flag</a></td>
<td class="text">false<span></span>
</td>
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<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_DocumentType', window );">Document Type</a></td>
<td class="text">424B3<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Entity Registrant Name</a></td>
<td class="text">BLACKROCK CORPORATE HIGH YIELD FUND, INC.<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_GeneralDescriptionOfRegistrantAbstract', window );"><strong>General Description of Registrant [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_InvestmentObjectivesAndPracticesTextBlock', window );">Investment Objectives and Practices [Text Block]</a></td>
<td class="text"><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">The following changes are made to each Fund&#8217;s Prospectus, as applicable: </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">With respect to HYT, CREDX, DSU, BKT, BLW, BIT and BLE, the section entitled &#8220;The Fund&#8217;s Investments &#8211; Portfolio Contents and Techniques &#8211; Securities Lending,&#8221; &#8220;The Trust&#8217;s Investments &#8211; Portfolio Contents and Techniques &#8211; Securities Lending&#8221; or &#8220;The Trust&#8217;s Investments &#8211; Lending of Securities,&#8221; as applicable, is hereby deleted in its entirety and replaced with the following, and with respect to GPS, the following is added to the section entitled &#8220;Investment Strategies&#8221;: </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"><div style="font-weight:bold;display:inline;"><div style="font-style:italic;display:inline;">Securities Lending</div></div>. The Fund may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities loan will be made on behalf of the Fund if, as a result, the aggregate value of all securities loans of the Fund <div style="white-space:nowrap;display:inline;">exceeds&#160;one-third&#160;of</div> the value of the Fund&#8217;s total assets (including the value of the collateral received). The Fund may terminate a loan at any time and obtain the return of the securities loaned. The Fund receives the value of any interest or cash <div style="white-space:nowrap;display:inline;">or&#160;non-cash&#160;distributions</div> paid on the loaned securities. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Fund is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Fund is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Fund for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Fund conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Fund and to retain an affiliate of the Fund as lending agent. To the extent that the Fund engages in securities lending, BlackRock Investment Management, LLC (&#8220;BIM&#8221;), an affiliate of the Advisor, acts as securities lending agent for the Fund, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">To the extent the Fund engages in securities lending, the Fund retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Fund is responsible for expenses in connection with the investment of cash collateral received for securities on </div>     <div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">loan (the &#8220;collateral investment expenses&#8221;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Fund. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#8217;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#8217;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Fund would be subject to any such liquidity fee or redemption gate imposed. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Under the securities lending program, the Fund is categorized into a specific asset class. The determination of the Fund&#8217;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Fund and BIM. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Pursuant to the current securities lending agreement: (i)&#160;if the Fund were to engage in securities lending, the Fund retains 82% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Fund, pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i)&#160;if the Fund were to engage in securities lending, 85% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><span></span>
</td>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_SecurityAxis=cik0001222401_BlackrockDebtStrategiesFundIncMember', window );">BLACKROCK DEBT STRATEGIES FUND, INC. [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_CoverAbstract', window );"><strong>Cover [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0001051003<span></span>
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<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Entity Registrant Name</a></td>
<td class="text">BLACKROCK DEBT STRATEGIES FUND, INC.<span></span>
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<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_GeneralDescriptionOfRegistrantAbstract', window );"><strong>General Description of Registrant [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_InvestmentObjectivesAndPracticesTextBlock', window );">Investment Objectives and Practices [Text Block]</a></td>
<td class="text"><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">The following changes are made to each Fund&#8217;s Prospectus, as applicable: </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">With respect to HYT, CREDX, DSU, BKT, BLW, BIT and BLE, the section entitled &#8220;The Fund&#8217;s Investments &#8211; Portfolio Contents and Techniques &#8211; Securities Lending,&#8221; &#8220;The Trust&#8217;s Investments &#8211; Portfolio Contents and Techniques &#8211; Securities Lending&#8221; or &#8220;The Trust&#8217;s Investments &#8211; Lending of Securities,&#8221; as applicable, is hereby deleted in its entirety and replaced with the following, and with respect to GPS, the following is added to the section entitled &#8220;Investment Strategies&#8221;: </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"><div style="font-weight:bold;display:inline;"><div style="font-style:italic;display:inline;">Securities Lending</div></div>. The Fund may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities loan will be made on behalf of the Fund if, as a result, the aggregate value of all securities loans of the Fund <div style="white-space:nowrap;display:inline;">exceeds&#160;one-third&#160;of</div> the value of the Fund&#8217;s total assets (including the value of the collateral received). The Fund may terminate a loan at any time and obtain the return of the securities loaned. The Fund receives the value of any interest or cash <div style="white-space:nowrap;display:inline;">or&#160;non-cash&#160;distributions</div> paid on the loaned securities. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Fund is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Fund is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Fund for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Fund conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Fund and to retain an affiliate of the Fund as lending agent. To the extent that the Fund engages in securities lending, BlackRock Investment Management, LLC (&#8220;BIM&#8221;), an affiliate of the Advisor, acts as securities lending agent for the Fund, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">To the extent the Fund engages in securities lending, the Fund retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Fund is responsible for expenses in connection with the investment of cash collateral received for securities on </div>    <div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">loan (the &#8220;collateral investment expenses&#8221;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Fund. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#8217;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#8217;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Fund would be subject to any such liquidity fee or redemption gate imposed. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Under the securities lending program, the Fund is categorized into a specific asset class. The determination of the Fund&#8217;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Fund and BIM. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Pursuant to the current securities lending agreement: (i)&#160;if the Fund were to engage in securities lending, the Fund retains 82% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Fund, pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i)&#160;if the Fund were to engage in securities lending, 85% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><span></span>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_SecurityAxis=cik0001222401_BlackrockIncomeTrustIncMember', window );">BLACKROCK INCOME TRUST, INC. [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_CoverAbstract', window );"><strong>Cover [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0000832327<span></span>
</td>
</tr>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Entity Registrant Name</a></td>
<td class="text">BLACKROCK INCOME TRUST, INC.<span></span>
</td>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_GeneralDescriptionOfRegistrantAbstract', window );"><strong>General Description of Registrant [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_InvestmentObjectivesAndPracticesTextBlock', window );">Investment Objectives and Practices [Text Block]</a></td>
<td class="text"><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">The following changes are made to each Fund&#8217;s Prospectus, as applicable: </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">With respect to HYT, CREDX, DSU, BKT, BLW, BIT and BLE, the section entitled &#8220;The Fund&#8217;s Investments &#8211; Portfolio Contents and Techniques &#8211; Securities Lending,&#8221; &#8220;The Trust&#8217;s Investments &#8211; Portfolio Contents and Techniques &#8211; Securities Lending&#8221; or &#8220;The Trust&#8217;s Investments &#8211; Lending of Securities,&#8221; as applicable, is hereby deleted in its entirety and replaced with the following, and with respect to GPS, the following is added to the section entitled &#8220;Investment Strategies&#8221;: </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"><div style="font-weight:bold;display:inline;"><div style="font-style:italic;display:inline;">Securities Lending</div></div>. The Fund may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities loan will be made on behalf of the Fund if, as a result, the aggregate value of all securities loans of the Fund <div style="white-space:nowrap;display:inline;">exceeds&#160;one-third&#160;of</div> the value of the Fund&#8217;s total assets (including the value of the collateral received). The Fund may terminate a loan at any time and obtain the return of the securities loaned. The Fund receives the value of any interest or cash <div style="white-space:nowrap;display:inline;">or&#160;non-cash&#160;distributions</div> paid on the loaned securities. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Fund is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Fund is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Fund for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Fund conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Fund and to retain an affiliate of the Fund as lending agent. To the extent that the Fund engages in securities lending, BlackRock Investment Management, LLC (&#8220;BIM&#8221;), an affiliate of the Advisor, acts as securities lending agent for the Fund, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">To the extent the Fund engages in securities lending, the Fund retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Fund is responsible for expenses in connection with the investment of cash collateral received for securities on </div>   <div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">loan (the &#8220;collateral investment expenses&#8221;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Fund. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#8217;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#8217;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Fund would be subject to any such liquidity fee or redemption gate imposed. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Under the securities lending program, the Fund is categorized into a specific asset class. The determination of the Fund&#8217;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Fund and BIM. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Pursuant to the current securities lending agreement: (i)&#160;if the Fund were to engage in securities lending, the Fund retains 82% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Fund, pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i)&#160;if the Fund were to engage in securities lending, 85% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><span></span>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_SecurityAxis=cik0001222401_BlackrockLimitedDurationIncomeTrustMember', window );">BLACKROCK LIMITED DURATION INCOME TRUST [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_CoverAbstract', window );"><strong>Cover [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0001233681<span></span>
</td>
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<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Entity Registrant Name</a></td>
<td class="text">BLACKROCK LIMITED DURATION INCOME TRUST<span></span>
</td>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_GeneralDescriptionOfRegistrantAbstract', window );"><strong>General Description of Registrant [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_InvestmentObjectivesAndPracticesTextBlock', window );">Investment Objectives and Practices [Text Block]</a></td>
<td class="text"><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">The following changes are made to each Fund&#8217;s Prospectus, as applicable: </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">With respect to HYT, CREDX, DSU, BKT, BLW, BIT and BLE, the section entitled &#8220;The Fund&#8217;s Investments &#8211; Portfolio Contents and Techniques &#8211; Securities Lending,&#8221; &#8220;The Trust&#8217;s Investments &#8211; Portfolio Contents and Techniques &#8211; Securities Lending&#8221; or &#8220;The Trust&#8217;s Investments &#8211; Lending of Securities,&#8221; as applicable, is hereby deleted in its entirety and replaced with the following, and with respect to GPS, the following is added to the section entitled &#8220;Investment Strategies&#8221;: </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"><div style="font-weight:bold;display:inline;"><div style="font-style:italic;display:inline;">Securities Lending</div></div>. The Fund may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities loan will be made on behalf of the Fund if, as a result, the aggregate value of all securities loans of the Fund <div style="white-space:nowrap;display:inline;">exceeds&#160;one-third&#160;of</div> the value of the Fund&#8217;s total assets (including the value of the collateral received). The Fund may terminate a loan at any time and obtain the return of the securities loaned. The Fund receives the value of any interest or cash <div style="white-space:nowrap;display:inline;">or&#160;non-cash&#160;distributions</div> paid on the loaned securities. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Fund is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Fund is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Fund for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Fund conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Fund and to retain an affiliate of the Fund as lending agent. To the extent that the Fund engages in securities lending, BlackRock Investment Management, LLC (&#8220;BIM&#8221;), an affiliate of the Advisor, acts as securities lending agent for the Fund, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">To the extent the Fund engages in securities lending, the Fund retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Fund is responsible for expenses in connection with the investment of cash collateral received for securities on </div>  <div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">loan (the &#8220;collateral investment expenses&#8221;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Fund. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#8217;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#8217;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Fund would be subject to any such liquidity fee or redemption gate imposed. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Under the securities lending program, the Fund is categorized into a specific asset class. The determination of the Fund&#8217;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Fund and BIM. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Pursuant to the current securities lending agreement: (i)&#160;if the Fund were to engage in securities lending, the Fund retains 82% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Fund, pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i)&#160;if the Fund were to engage in securities lending, 85% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><span></span>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_SecurityAxis=cik0001222401_BlackrockMultisectorIncomeTrustMember', window );">BLACKROCK MULTI-SECTOR INCOME TRUST [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_CoverAbstract', window );"><strong>Cover [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0001562818<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Entity Registrant Name</a></td>
<td class="text">BLACKROCK MULTI-SECTOR INCOME TRUST<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_GeneralDescriptionOfRegistrantAbstract', window );"><strong>General Description of Registrant [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_InvestmentObjectivesAndPracticesTextBlock', window );">Investment Objectives and Practices [Text Block]</a></td>
<td class="text"><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">The following changes are made to each Fund&#8217;s Prospectus, as applicable: </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">With respect to HYT, CREDX, DSU, BKT, BLW, BIT and BLE, the section entitled &#8220;The Fund&#8217;s Investments &#8211; Portfolio Contents and Techniques &#8211; Securities Lending,&#8221; &#8220;The Trust&#8217;s Investments &#8211; Portfolio Contents and Techniques &#8211; Securities Lending&#8221; or &#8220;The Trust&#8217;s Investments &#8211; Lending of Securities,&#8221; as applicable, is hereby deleted in its entirety and replaced with the following, and with respect to GPS, the following is added to the section entitled &#8220;Investment Strategies&#8221;: </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"><div style="font-weight:bold;display:inline;"><div style="font-style:italic;display:inline;">Securities Lending</div></div>. The Fund may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities loan will be made on behalf of the Fund if, as a result, the aggregate value of all securities loans of the Fund <div style="white-space:nowrap;display:inline;">exceeds&#160;one-third&#160;of</div> the value of the Fund&#8217;s total assets (including the value of the collateral received). The Fund may terminate a loan at any time and obtain the return of the securities loaned. The Fund receives the value of any interest or cash <div style="white-space:nowrap;display:inline;">or&#160;non-cash&#160;distributions</div> paid on the loaned securities. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Fund is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Fund is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Fund for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Fund conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Fund and to retain an affiliate of the Fund as lending agent. To the extent that the Fund engages in securities lending, BlackRock Investment Management, LLC (&#8220;BIM&#8221;), an affiliate of the Advisor, acts as securities lending agent for the Fund, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">To the extent the Fund engages in securities lending, the Fund retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Fund is responsible for expenses in connection with the investment of cash collateral received for securities on </div> <div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">loan (the &#8220;collateral investment expenses&#8221;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Fund. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#8217;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#8217;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Fund would be subject to any such liquidity fee or redemption gate imposed. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Under the securities lending program, the Fund is categorized into a specific asset class. The determination of the Fund&#8217;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Fund and BIM. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Pursuant to the current securities lending agreement: (i)&#160;if the Fund were to engage in securities lending, the Fund retains 82% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Fund, pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i)&#160;if the Fund were to engage in securities lending, 85% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><span></span>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_SecurityAxis=cik0001222401_BlackrockMunicipalIncomeTrustIiMember', window );">BLACKROCK MUNICIPAL INCOME TRUST II [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_CoverAbstract', window );"><strong>Cover [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0001176194<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Entity Registrant Name</a></td>
<td class="text">BLACKROCK MUNICIPAL INCOME TRUST II<span></span>
</td>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_GeneralDescriptionOfRegistrantAbstract', window );"><strong>General Description of Registrant [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_InvestmentObjectivesAndPracticesTextBlock', window );">Investment Objectives and Practices [Text Block]</a></td>
<td class="text"><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">The following changes are made to each Fund&#8217;s Prospectus, as applicable: </div><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">With respect to HYT, CREDX, DSU, BKT, BLW, BIT and BLE, the section entitled &#8220;The Fund&#8217;s Investments &#8211; Portfolio Contents and Techniques &#8211; Securities Lending,&#8221; &#8220;The Trust&#8217;s Investments &#8211; Portfolio Contents and Techniques &#8211; Securities Lending&#8221; or &#8220;The Trust&#8217;s Investments &#8211; Lending of Securities,&#8221; as applicable, is hereby deleted in its entirety and replaced with the following, and with respect to GPS, the following is added to the section entitled &#8220;Investment Strategies&#8221;: </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"><div style="font-weight:bold;display:inline;"><div style="font-style:italic;display:inline;">Securities Lending</div></div>. The Fund may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities loan will be made on behalf of the Fund if, as a result, the aggregate value of all securities loans of the Fund <div style="white-space:nowrap;display:inline;">exceeds&#160;one-third&#160;of</div> the value of the Fund&#8217;s total assets (including the value of the collateral received). The Fund may terminate a loan at any time and obtain the return of the securities loaned. The Fund receives the value of any interest or cash <div style="white-space:nowrap;display:inline;">or&#160;non-cash&#160;distributions</div> paid on the loaned securities. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Fund is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Fund is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Fund for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Fund conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Fund and to retain an affiliate of the Fund as lending agent. To the extent that the Fund engages in securities lending, BlackRock Investment Management, LLC (&#8220;BIM&#8221;), an affiliate of the Advisor, acts as securities lending agent for the Fund, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">To the extent the Fund engages in securities lending, the Fund retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Fund is responsible for expenses in connection with the investment of cash collateral received for securities on </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">loan (the &#8220;collateral investment expenses&#8221;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Fund. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#8217;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#8217;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Fund would be subject to any such liquidity fee or redemption gate imposed. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Under the securities lending program, the Fund is categorized into a specific asset class. The determination of the Fund&#8217;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Fund and BIM. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Pursuant to the current securities lending agreement: (i)&#160;if the Fund were to engage in securities lending, the Fund retains 82% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Fund, pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i)&#160;if the Fund were to engage in securities lending, 85% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><span></span>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_SecurityAxis=cik0001222401_BlackrockHealthSciencesTrustMember', window );">BLACKROCK HEALTH SCIENCES TRUST [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_CoverAbstract', window );"><strong>Cover [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0001314966<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Entity Registrant Name</a></td>
<td class="text">BLACKROCK HEALTH SCIENCES TRUST<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_GeneralDescriptionOfRegistrantAbstract', window );"><strong>General Description of Registrant [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_InvestmentObjectivesAndPracticesTextBlock', window );">Investment Objectives and Practices [Text Block]</a></td>
<td class="text"><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">With respect to BME and BST, the section entitled &#8220;The Trust&#8217;s Investments &#8211; Portfolio Contents and Techniques &#8211; Securities Lending&#8221; is hereby deleted in its entirety and replaced with the following: </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"><div style="font-weight:bold;display:inline;"><div style="font-style:italic;display:inline;">Securities Lending</div></div>. The Trust may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities loan will be made on behalf of the Trust if, as a result, the aggregate value of all securities loans of the Trust <div style="white-space:nowrap;display:inline;">exceeds&#160;one-third&#160;of</div> the value of the Trust&#8217;s total assets (including the value of the collateral received). The Trust may terminate a loan at any time and obtain the return of the securities loaned. The Trust receives the value of any interest or cash <div style="white-space:nowrap;display:inline;">or&#160;non-cash&#160;distributions</div> paid on the loaned securities. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Trust is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Trust is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Trust for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. </div><div style="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&#160;</div><div style="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Trust conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Trust and to retain an affiliate of the Trust as lending agent. To the extent that the Trust engages in securities lending, BlackRock Investment Management, LLC (&#8220;BIM&#8221;), an affiliate of the Advisor, acts as securities lending agent for the Trust, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Trust retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Trust is responsible for expenses in connection with the investment of cash collateral received for securities on loan (the &#8220;collateral investment expenses&#8221;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Trust. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#8217;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#8217;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Trust would be subject to any such liquidity fee or redemption gate imposed. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Under the securities lending program, the Trust is categorized into a specific asset class. The determination of the Trust&#8217;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Trust and BIM. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Pursuant to the current securities lending agreement: (i)&#160;the Trust retains 81% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Trust, pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i) 81% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Prior to January&#160;1, 2023, the Trust was subject to a different securities lending fee arrangement. </div><span></span>
</td>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_SecurityAxis=cik0001222401_BlackrockScienceAndTechnologyTrustMember', window );">BLACKROCK SCIENCE AND TECHNOLOGY TRUST [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_CoverAbstract', window );"><strong>Cover [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0001616678<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Entity Registrant Name</a></td>
<td class="text">BLACKROCK SCIENCE AND TECHNOLOGY TRUST<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_GeneralDescriptionOfRegistrantAbstract', window );"><strong>General Description of Registrant [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_InvestmentObjectivesAndPracticesTextBlock', window );">Investment Objectives and Practices [Text Block]</a></td>
<td class="text"><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">With respect to BME and BST, the section entitled &#8220;The Trust&#8217;s Investments &#8211; Portfolio Contents and Techniques &#8211; Securities Lending&#8221; is hereby deleted in its entirety and replaced with the following: </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"><div style="font-weight:bold;display:inline;"><div style="font-style:italic;display:inline;">Securities Lending</div></div>. The Trust may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities loan will be made on behalf of the Trust if, as a result, the aggregate value of all securities loans of the Trust <div style="white-space:nowrap;display:inline;">exceeds&#160;one-third&#160;of</div> the value of the Trust&#8217;s total assets (including the value of the collateral received). The Trust may terminate a loan at any time and obtain the return of the securities loaned. The Trust receives the value of any interest or cash <div style="white-space:nowrap;display:inline;">or&#160;non-cash&#160;distributions</div> paid on the loaned securities. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Trust is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Trust is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Trust for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. </div><div style="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&#160;</div><div style="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Trust conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Trust and to retain an affiliate of the Trust as lending agent. To the extent that the Trust engages in securities lending, BlackRock Investment Management, LLC (&#8220;BIM&#8221;), an affiliate of the Advisor, acts as securities lending agent for the Trust, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Trust retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Trust is responsible for expenses in connection with the investment of cash collateral received for securities on loan (the &#8220;collateral investment expenses&#8221;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Trust. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#8217;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#8217;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Trust would be subject to any such liquidity fee or redemption gate imposed. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Under the securities lending program, the Trust is categorized into a specific asset class. The determination of the Trust&#8217;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Trust and BIM. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Pursuant to the current securities lending agreement: (i)&#160;the Trust retains 81% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Trust, pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i) 81% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Prior to January&#160;1, 2023, the Trust was subject to a different securities lending fee arrangement. </div><span></span>
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<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_SecurityAxis=cik0001222401_BlackrockUtilitiesInfrastructurePowerOpportunitiesTrustMember', window );">BLACKROCK UTILITIES, INFRASTRUCTURE &amp; POWER OPPORTUNITIES TRUST [Member]</a></td>
<td class="text">&#160;<span></span>
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<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_CoverAbstract', window );"><strong>Cover [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
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<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0001528988<span></span>
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<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Entity Registrant Name</a></td>
<td class="text">BLACKROCK UTILITIES, INFRASTRUCTURE & POWER OPPORTUNITIES TRUST<span></span>
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<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_GeneralDescriptionOfRegistrantAbstract', window );"><strong>General Description of Registrant [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
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<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_cef_InvestmentObjectivesAndPracticesTextBlock', window );">Investment Objectives and Practices [Text Block]</a></td>
<td class="text"><div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold">With respect to BUI, the section entitled &#8220;The Trust&#8217;s Investments &#8211; Portfolio Contents and Techniques &#8211; Securities Lending&#8221; is hereby deleted in its entirety and replaced with the following: </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"><div style="font-weight:bold;display:inline;"><div style="font-style:italic;display:inline;">Securities Lending</div></div>. The Trust may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">loan will be made on behalf of the Trust if, as a result, the aggregate value of all securities loans of the Trust <div style="white-space:nowrap;display:inline;">exceeds&#160;one-third&#160;of</div> the value of the Trust&#8217;s total assets (including the value of the collateral received). The Trust may terminate a loan at any time and obtain the return of the securities loaned. The Trust receives the value of any interest or cash <div style="white-space:nowrap;display:inline;">or&#160;non-cash&#160;distributions</div> paid on the loaned securities. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Trust is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Trust is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Trust for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Trust conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Trust and to retain an affiliate of the Trust as lending agent. To the extent that the Trust engages in securities lending, BlackRock Investment Management, LLC (&#8220;BIM&#8221;), an affiliate of the Advisor, acts as securities lending agent for the Trust, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Trust retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Trust is responsible for expenses in connection with the investment of cash collateral received for securities on loan (the &#8220;collateral investment expenses&#8221;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Trust. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#8217;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#8217;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Trust would be subject to any such liquidity fee or redemption gate imposed. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Under the securities lending program, the Trust is categorized into a specific asset class. The determination of the Trust&#8217;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Trust and BIM. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Pursuant to the current securities lending agreement: (i)&#160;the Trust retains 82% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Trust, </div><div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i) 85% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. </div><span></span>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Form N-2<br> -Section Item 8<br></p></div>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Form N-2<br> -Section Item 8<br> -Subsection 2<br> -Paragraph b, d<br></p></div>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Cover page.</p></div>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
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The Fund may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities loan will be made on behalf of the Fund if, as a result, the aggregate value of all securities loans of the Fund &lt;div style="white-space:nowrap;display:inline;"&gt;exceeds&#160;one-third&#160;of&lt;/div&gt; the value of the Fund&#x2019;s total assets (including the value of the collateral received). The Fund may terminate a loan at any time and obtain the return of the securities loaned. The Fund receives the value of any interest or cash &lt;div style="white-space:nowrap;display:inline;"&gt;or&#160;non-cash&#160;distributions&lt;/div&gt; paid on the loaned securities. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Fund is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Fund is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Fund for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;The Fund conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Fund and to retain an affiliate of the Fund as lending agent. To the extent that the Fund engages in securities lending, BlackRock Investment Management, LLC (&#x201c;BIM&#x201d;), an affiliate of the Advisor, acts as securities lending agent for the Fund, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;To the extent the Fund engages in securities lending, the Fund retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Fund is responsible for expenses in connection with the investment of cash collateral received for securities on &lt;/div&gt;     &lt;div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"&gt;loan (the &#x201c;collateral investment expenses&#x201d;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Fund. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#x2019;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#x2019;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Fund would be subject to any such liquidity fee or redemption gate imposed. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Under the securities lending program, the Fund is categorized into a specific asset class. The determination of the Fund&#x2019;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Fund and BIM. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Pursuant to the current securities lending agreement: (i)&#160;if the Fund were to engage in securities lending, the Fund retains 82% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Fund, pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i)&#160;if the Fund were to engage in securities lending, 85% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. &lt;/div&gt;</cef:InvestmentObjectivesAndPracticesTextBlock>
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The Fund may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities loan will be made on behalf of the Fund if, as a result, the aggregate value of all securities loans of the Fund &lt;div style="white-space:nowrap;display:inline;"&gt;exceeds&#160;one-third&#160;of&lt;/div&gt; the value of the Fund&#x2019;s total assets (including the value of the collateral received). The Fund may terminate a loan at any time and obtain the return of the securities loaned. The Fund receives the value of any interest or cash &lt;div style="white-space:nowrap;display:inline;"&gt;or&#160;non-cash&#160;distributions&lt;/div&gt; paid on the loaned securities. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Fund is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Fund is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Fund for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;The Fund conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Fund and to retain an affiliate of the Fund as lending agent. To the extent that the Fund engages in securities lending, BlackRock Investment Management, LLC (&#x201c;BIM&#x201d;), an affiliate of the Advisor, acts as securities lending agent for the Fund, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;To the extent the Fund engages in securities lending, the Fund retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Fund is responsible for expenses in connection with the investment of cash collateral received for securities on &lt;/div&gt;    &lt;div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"&gt;loan (the &#x201c;collateral investment expenses&#x201d;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Fund. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#x2019;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#x2019;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Fund would be subject to any such liquidity fee or redemption gate imposed. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Under the securities lending program, the Fund is categorized into a specific asset class. The determination of the Fund&#x2019;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Fund and BIM. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Pursuant to the current securities lending agreement: (i)&#160;if the Fund were to engage in securities lending, the Fund retains 82% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Fund, pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i)&#160;if the Fund were to engage in securities lending, 85% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. &lt;/div&gt;</cef:InvestmentObjectivesAndPracticesTextBlock>
    <cef:InvestmentObjectivesAndPracticesTextBlock contextRef="P01_03_2023To01_03_2023_BlackrockIncomeTrustIncMembercefSecurityAxis">&lt;div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold"&gt;The following changes are made to each Fund&#x2019;s Prospectus, as applicable: &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold"&gt;With respect to HYT, CREDX, DSU, BKT, BLW, BIT and BLE, the section entitled &#x201c;The Fund&#x2019;s Investments &#x2013; Portfolio Contents and Techniques &#x2013; Securities Lending,&#x201d; &#x201c;The Trust&#x2019;s Investments &#x2013; Portfolio Contents and Techniques &#x2013; Securities Lending&#x201d; or &#x201c;The Trust&#x2019;s Investments &#x2013; Lending of Securities,&#x201d; as applicable, is hereby deleted in its entirety and replaced with the following, and with respect to GPS, the following is added to the section entitled &#x201c;Investment Strategies&#x201d;: &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;&lt;div style="font-weight:bold;display:inline;"&gt;&lt;div style="font-style:italic;display:inline;"&gt;Securities Lending&lt;/div&gt;&lt;/div&gt;. The Fund may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities loan will be made on behalf of the Fund if, as a result, the aggregate value of all securities loans of the Fund &lt;div style="white-space:nowrap;display:inline;"&gt;exceeds&#160;one-third&#160;of&lt;/div&gt; the value of the Fund&#x2019;s total assets (including the value of the collateral received). The Fund may terminate a loan at any time and obtain the return of the securities loaned. The Fund receives the value of any interest or cash &lt;div style="white-space:nowrap;display:inline;"&gt;or&#160;non-cash&#160;distributions&lt;/div&gt; paid on the loaned securities. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Fund is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Fund is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Fund for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;The Fund conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Fund and to retain an affiliate of the Fund as lending agent. To the extent that the Fund engages in securities lending, BlackRock Investment Management, LLC (&#x201c;BIM&#x201d;), an affiliate of the Advisor, acts as securities lending agent for the Fund, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;To the extent the Fund engages in securities lending, the Fund retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Fund is responsible for expenses in connection with the investment of cash collateral received for securities on &lt;/div&gt;   &lt;div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"&gt;loan (the &#x201c;collateral investment expenses&#x201d;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Fund. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#x2019;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#x2019;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Fund would be subject to any such liquidity fee or redemption gate imposed. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Under the securities lending program, the Fund is categorized into a specific asset class. The determination of the Fund&#x2019;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Fund and BIM. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Pursuant to the current securities lending agreement: (i)&#160;if the Fund were to engage in securities lending, the Fund retains 82% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Fund, pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i)&#160;if the Fund were to engage in securities lending, 85% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. &lt;/div&gt;</cef:InvestmentObjectivesAndPracticesTextBlock>
    <cef:InvestmentObjectivesAndPracticesTextBlock contextRef="P01_03_2023To01_03_2023_BlackrockLimitedDurationIncomeTrustMembercefSecurityAxis">&lt;div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold"&gt;The following changes are made to each Fund&#x2019;s Prospectus, as applicable: &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold"&gt;With respect to HYT, CREDX, DSU, BKT, BLW, BIT and BLE, the section entitled &#x201c;The Fund&#x2019;s Investments &#x2013; Portfolio Contents and Techniques &#x2013; Securities Lending,&#x201d; &#x201c;The Trust&#x2019;s Investments &#x2013; Portfolio Contents and Techniques &#x2013; Securities Lending&#x201d; or &#x201c;The Trust&#x2019;s Investments &#x2013; Lending of Securities,&#x201d; as applicable, is hereby deleted in its entirety and replaced with the following, and with respect to GPS, the following is added to the section entitled &#x201c;Investment Strategies&#x201d;: &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;&lt;div style="font-weight:bold;display:inline;"&gt;&lt;div style="font-style:italic;display:inline;"&gt;Securities Lending&lt;/div&gt;&lt;/div&gt;. The Fund may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities loan will be made on behalf of the Fund if, as a result, the aggregate value of all securities loans of the Fund &lt;div style="white-space:nowrap;display:inline;"&gt;exceeds&#160;one-third&#160;of&lt;/div&gt; the value of the Fund&#x2019;s total assets (including the value of the collateral received). The Fund may terminate a loan at any time and obtain the return of the securities loaned. The Fund receives the value of any interest or cash &lt;div style="white-space:nowrap;display:inline;"&gt;or&#160;non-cash&#160;distributions&lt;/div&gt; paid on the loaned securities. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Fund is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Fund is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Fund for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;The Fund conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Fund and to retain an affiliate of the Fund as lending agent. To the extent that the Fund engages in securities lending, BlackRock Investment Management, LLC (&#x201c;BIM&#x201d;), an affiliate of the Advisor, acts as securities lending agent for the Fund, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;To the extent the Fund engages in securities lending, the Fund retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Fund is responsible for expenses in connection with the investment of cash collateral received for securities on &lt;/div&gt;  &lt;div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"&gt;loan (the &#x201c;collateral investment expenses&#x201d;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Fund. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#x2019;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#x2019;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Fund would be subject to any such liquidity fee or redemption gate imposed. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Under the securities lending program, the Fund is categorized into a specific asset class. The determination of the Fund&#x2019;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Fund and BIM. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Pursuant to the current securities lending agreement: (i)&#160;if the Fund were to engage in securities lending, the Fund retains 82% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Fund, pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i)&#160;if the Fund were to engage in securities lending, 85% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. &lt;/div&gt;</cef:InvestmentObjectivesAndPracticesTextBlock>
    <cef:InvestmentObjectivesAndPracticesTextBlock contextRef="P01_03_2023To01_03_2023_BlackrockMultisectorIncomeTrustMembercefSecurityAxis">&lt;div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold"&gt;The following changes are made to each Fund&#x2019;s Prospectus, as applicable: &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold"&gt;With respect to HYT, CREDX, DSU, BKT, BLW, BIT and BLE, the section entitled &#x201c;The Fund&#x2019;s Investments &#x2013; Portfolio Contents and Techniques &#x2013; Securities Lending,&#x201d; &#x201c;The Trust&#x2019;s Investments &#x2013; Portfolio Contents and Techniques &#x2013; Securities Lending&#x201d; or &#x201c;The Trust&#x2019;s Investments &#x2013; Lending of Securities,&#x201d; as applicable, is hereby deleted in its entirety and replaced with the following, and with respect to GPS, the following is added to the section entitled &#x201c;Investment Strategies&#x201d;: &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;&lt;div style="font-weight:bold;display:inline;"&gt;&lt;div style="font-style:italic;display:inline;"&gt;Securities Lending&lt;/div&gt;&lt;/div&gt;. The Fund may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities loan will be made on behalf of the Fund if, as a result, the aggregate value of all securities loans of the Fund &lt;div style="white-space:nowrap;display:inline;"&gt;exceeds&#160;one-third&#160;of&lt;/div&gt; the value of the Fund&#x2019;s total assets (including the value of the collateral received). The Fund may terminate a loan at any time and obtain the return of the securities loaned. The Fund receives the value of any interest or cash &lt;div style="white-space:nowrap;display:inline;"&gt;or&#160;non-cash&#160;distributions&lt;/div&gt; paid on the loaned securities. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Fund is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Fund is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Fund for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;The Fund conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Fund and to retain an affiliate of the Fund as lending agent. To the extent that the Fund engages in securities lending, BlackRock Investment Management, LLC (&#x201c;BIM&#x201d;), an affiliate of the Advisor, acts as securities lending agent for the Fund, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;To the extent the Fund engages in securities lending, the Fund retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Fund is responsible for expenses in connection with the investment of cash collateral received for securities on &lt;/div&gt; &lt;div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"&gt;loan (the &#x201c;collateral investment expenses&#x201d;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Fund. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#x2019;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#x2019;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Fund would be subject to any such liquidity fee or redemption gate imposed. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Under the securities lending program, the Fund is categorized into a specific asset class. The determination of the Fund&#x2019;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Fund and BIM. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Pursuant to the current securities lending agreement: (i)&#160;if the Fund were to engage in securities lending, the Fund retains 82% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Fund, pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i)&#160;if the Fund were to engage in securities lending, 85% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. &lt;/div&gt;</cef:InvestmentObjectivesAndPracticesTextBlock>
    <cef:InvestmentObjectivesAndPracticesTextBlock contextRef="P01_03_2023To01_03_2023_BlackrockMunicipalIncomeTrustIiMembercefSecurityAxis">&lt;div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold"&gt;The following changes are made to each Fund&#x2019;s Prospectus, as applicable: &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold"&gt;With respect to HYT, CREDX, DSU, BKT, BLW, BIT and BLE, the section entitled &#x201c;The Fund&#x2019;s Investments &#x2013; Portfolio Contents and Techniques &#x2013; Securities Lending,&#x201d; &#x201c;The Trust&#x2019;s Investments &#x2013; Portfolio Contents and Techniques &#x2013; Securities Lending&#x201d; or &#x201c;The Trust&#x2019;s Investments &#x2013; Lending of Securities,&#x201d; as applicable, is hereby deleted in its entirety and replaced with the following, and with respect to GPS, the following is added to the section entitled &#x201c;Investment Strategies&#x201d;: &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;&lt;div style="font-weight:bold;display:inline;"&gt;&lt;div style="font-style:italic;display:inline;"&gt;Securities Lending&lt;/div&gt;&lt;/div&gt;. The Fund may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities loan will be made on behalf of the Fund if, as a result, the aggregate value of all securities loans of the Fund &lt;div style="white-space:nowrap;display:inline;"&gt;exceeds&#160;one-third&#160;of&lt;/div&gt; the value of the Fund&#x2019;s total assets (including the value of the collateral received). The Fund may terminate a loan at any time and obtain the return of the securities loaned. The Fund receives the value of any interest or cash &lt;div style="white-space:nowrap;display:inline;"&gt;or&#160;non-cash&#160;distributions&lt;/div&gt; paid on the loaned securities. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Fund is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Fund is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Fund for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;The Fund conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Fund and to retain an affiliate of the Fund as lending agent. To the extent that the Fund engages in securities lending, BlackRock Investment Management, LLC (&#x201c;BIM&#x201d;), an affiliate of the Advisor, acts as securities lending agent for the Fund, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;To the extent the Fund engages in securities lending, the Fund retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Fund is responsible for expenses in connection with the investment of cash collateral received for securities on &lt;/div&gt;&lt;div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"&gt;loan (the &#x201c;collateral investment expenses&#x201d;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Fund. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#x2019;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#x2019;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Fund would be subject to any such liquidity fee or redemption gate imposed. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Under the securities lending program, the Fund is categorized into a specific asset class. The determination of the Fund&#x2019;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Fund and BIM. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Pursuant to the current securities lending agreement: (i)&#160;if the Fund were to engage in securities lending, the Fund retains 82% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Fund, pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i)&#160;if the Fund were to engage in securities lending, 85% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. &lt;/div&gt;</cef:InvestmentObjectivesAndPracticesTextBlock>
    <cef:InvestmentObjectivesAndPracticesTextBlock contextRef="P01_03_2023To01_03_2023_BlackrockHealthSciencesTrustMembercefSecurityAxis">&lt;div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold"&gt;With respect to BME and BST, the section entitled &#x201c;The Trust&#x2019;s Investments &#x2013; Portfolio Contents and Techniques &#x2013; Securities Lending&#x201d; is hereby deleted in its entirety and replaced with the following: &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;&lt;div style="font-weight:bold;display:inline;"&gt;&lt;div style="font-style:italic;display:inline;"&gt;Securities Lending&lt;/div&gt;&lt;/div&gt;. The Trust may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities loan will be made on behalf of the Trust if, as a result, the aggregate value of all securities loans of the Trust &lt;div style="white-space:nowrap;display:inline;"&gt;exceeds&#160;one-third&#160;of&lt;/div&gt; the value of the Trust&#x2019;s total assets (including the value of the collateral received). The Trust may terminate a loan at any time and obtain the return of the securities loaned. The Trust receives the value of any interest or cash &lt;div style="white-space:nowrap;display:inline;"&gt;or&#160;non-cash&#160;distributions&lt;/div&gt; paid on the loaned securities. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Trust is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Trust is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Trust for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. &lt;/div&gt;&lt;div style="margin-top:0pt;margin-bottom:0pt ; font-size:8pt"&gt;&#160;&lt;/div&gt;&lt;div style="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;The Trust conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Trust and to retain an affiliate of the Trust as lending agent. To the extent that the Trust engages in securities lending, BlackRock Investment Management, LLC (&#x201c;BIM&#x201d;), an affiliate of the Advisor, acts as securities lending agent for the Trust, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;The Trust retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Trust is responsible for expenses in connection with the investment of cash collateral received for securities on loan (the &#x201c;collateral investment expenses&#x201d;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Trust. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#x2019;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#x2019;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Trust would be subject to any such liquidity fee or redemption gate imposed. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Under the securities lending program, the Trust is categorized into a specific asset class. The determination of the Trust&#x2019;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Trust and BIM. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Pursuant to the current securities lending agreement: (i)&#160;the Trust retains 81% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Trust, pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i) 81% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Prior to January&#160;1, 2023, the Trust was subject to a different securities lending fee arrangement. &lt;/div&gt;</cef:InvestmentObjectivesAndPracticesTextBlock>
    <cef:InvestmentObjectivesAndPracticesTextBlock contextRef="P01_03_2023To01_03_2023_BlackrockScienceAndTechnologyTrustMembercefSecurityAxis">&lt;div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold"&gt;With respect to BME and BST, the section entitled &#x201c;The Trust&#x2019;s Investments &#x2013; Portfolio Contents and Techniques &#x2013; Securities Lending&#x201d; is hereby deleted in its entirety and replaced with the following: &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;&lt;div style="font-weight:bold;display:inline;"&gt;&lt;div style="font-style:italic;display:inline;"&gt;Securities Lending&lt;/div&gt;&lt;/div&gt;. The Trust may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities loan will be made on behalf of the Trust if, as a result, the aggregate value of all securities loans of the Trust &lt;div style="white-space:nowrap;display:inline;"&gt;exceeds&#160;one-third&#160;of&lt;/div&gt; the value of the Trust&#x2019;s total assets (including the value of the collateral received). The Trust may terminate a loan at any time and obtain the return of the securities loaned. The Trust receives the value of any interest or cash &lt;div style="white-space:nowrap;display:inline;"&gt;or&#160;non-cash&#160;distributions&lt;/div&gt; paid on the loaned securities. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Trust is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Trust is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Trust for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. &lt;/div&gt;&lt;div style="margin-top:0pt;margin-bottom:0pt ; font-size:8pt"&gt;&#160;&lt;/div&gt;&lt;div style="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;The Trust conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Trust and to retain an affiliate of the Trust as lending agent. To the extent that the Trust engages in securities lending, BlackRock Investment Management, LLC (&#x201c;BIM&#x201d;), an affiliate of the Advisor, acts as securities lending agent for the Trust, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;The Trust retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Trust is responsible for expenses in connection with the investment of cash collateral received for securities on loan (the &#x201c;collateral investment expenses&#x201d;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Trust. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#x2019;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#x2019;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Trust would be subject to any such liquidity fee or redemption gate imposed. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Under the securities lending program, the Trust is categorized into a specific asset class. The determination of the Trust&#x2019;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Trust and BIM. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Pursuant to the current securities lending agreement: (i)&#160;the Trust retains 81% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Trust, pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i) 81% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Prior to January&#160;1, 2023, the Trust was subject to a different securities lending fee arrangement. &lt;/div&gt;</cef:InvestmentObjectivesAndPracticesTextBlock>
    <cef:InvestmentObjectivesAndPracticesTextBlock contextRef="P01_03_2023To01_03_2023_BlackrockUtilitiesInfrastructurePowerOpportunitiesTrustMembercefSecurityAxis">&lt;div style="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman;font-weight:bold"&gt;With respect to BUI, the section entitled &#x201c;The Trust&#x2019;s Investments &#x2013; Portfolio Contents and Techniques &#x2013; Securities Lending&#x201d; is hereby deleted in its entirety and replaced with the following: &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;&lt;div style="font-weight:bold;display:inline;"&gt;&lt;div style="font-style:italic;display:inline;"&gt;Securities Lending&lt;/div&gt;&lt;/div&gt;. The Trust may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities &lt;/div&gt;&lt;div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"&gt;loan will be made on behalf of the Trust if, as a result, the aggregate value of all securities loans of the Trust &lt;div style="white-space:nowrap;display:inline;"&gt;exceeds&#160;one-third&#160;of&lt;/div&gt; the value of the Trust&#x2019;s total assets (including the value of the collateral received). The Trust may terminate a loan at any time and obtain the return of the securities loaned. The Trust receives the value of any interest or cash &lt;div style="white-space:nowrap;display:inline;"&gt;or&#160;non-cash&#160;distributions&lt;/div&gt; paid on the loaned securities. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Trust is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Trust is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Trust for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or their affiliates; such investments are subject to investment risk. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;The Trust conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Trust and to retain an affiliate of the Trust as lending agent. To the extent that the Trust engages in securities lending, BlackRock Investment Management, LLC (&#x201c;BIM&#x201d;), an affiliate of the Advisor, acts as securities lending agent for the Trust, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;The Trust retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Trust is responsible for expenses in connection with the investment of cash collateral received for securities on loan (the &#x201c;collateral investment expenses&#x201d;). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Trust. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company&#x2019;s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company&#x2019;s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Trust would be subject to any such liquidity fee or redemption gate imposed. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Under the securities lending program, the Trust is categorized into a specific asset class. The determination of the Trust&#x2019;s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Trust and BIM. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;Pursuant to the current securities lending agreement: (i)&#160;the Trust retains 82% of securities lending income (which excludes collateral investment expenses), and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. &lt;/div&gt;&lt;div style="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"&gt;In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Trust, &lt;/div&gt;&lt;div style="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"&gt;pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i) 85% of securities lending income (which excludes collateral investment expenses); and (ii)&#160;this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. &lt;/div&gt;</cef:InvestmentObjectivesAndPracticesTextBlock>
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end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
