    <SEC-DOCUMENT>0001193125-24-060517-index.html : 20240306
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    ACCESSION NUMBER:		0001193125-24-060517
    CONFORMED SUBMISSION TYPE:	N-CSR
    PUBLIC DOCUMENT COUNT:		19
    CONFORMED PERIOD OF REPORT:	20231231
    FILED AS OF DATE:		20240306
    DATE AS OF CHANGE:		20240306
    EFFECTIVENESS DATE:		20240306

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			BLACKROCK CREDIT ALLOCATION INCOME TRUST
    		CENTRAL INDEX KEY:			0001379384
    		ORGANIZATION NAME:
    		IRS NUMBER:				000000000
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1031

    	FILING VALUES:
    		FORM TYPE:		N-CSR
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-21972
    		FILM NUMBER:		24725271

    	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 CREDIT ALLOCATION INCOME TRUST IV
    		DATE OF NAME CHANGE:	20091113

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	BLACKROCK PREFERRED & EQUITY ADVANTAGE TRUST
    		DATE OF NAME CHANGE:	20070629

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	BlackRock Preferred & Equity Advantage Trust
    		DATE OF NAME CHANGE:	20061115
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>N-CSR
    <SEQUENCE>1
    <FILENAME>d182871dncsr.htm
    <DESCRIPTION>BLACKROCK CREDIT ALLOCATION INCOME TRUST
    <TEXT>
    Document 1 - file: d182871dncsr.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>2
    <FILENAME>d182871dex99cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 302
    <TEXT>
    Document 2 - file: d182871dex99cert.htm

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    <DOCUMENT>
    <TYPE>EX-99.906CERT
    <SEQUENCE>3
    <FILENAME>d182871dex99906cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 906
    <TEXT>
    Document 3 - file: d182871dex99906cert.htm

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    <SEQUENCE>4
    <FILENAME>d182871dex99proxypol.htm
    <DESCRIPTION>PROXY VOTING POLICY AND PROCEDURES
    <TEXT>
    Document 4 - file: d182871dex99proxypol.htm

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    <DOCUMENT>
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    <SEQUENCE>5
    <FILENAME>d182871dex99globalcorpgov.htm
    <DESCRIPTION>GLOBAL CORPORATE GOVERNANCE & ENGAGEMENT PRINCIPLES
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    Document 5 - file: d182871dex99globalcorpgov.htm

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    <SEQUENCE>6
    <FILENAME>d182871dex99uscorpgov.htm
    <DESCRIPTION>CORPORATE GOVERNANCE AND PROXY VOTING GUIDELINES FOR U.S. SECURITIES
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    Document 6 - file: d182871dex99uscorpgov.htm

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    <SEQUENCE>7
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    <DESCRIPTION>SECTION 19 NOTICES
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    Document 7 - file: d182871dex99section19.htm

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    Document 8 - file: g179418g16g16.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 9 - file: g179418g37g37.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 10 - file: g179418sp15a.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 11 - file: g179418sp15aa.jpg

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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: g632386g42l24.jpg

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    <SEQUENCE>13
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: g632386g43e33.gif

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    <SEQUENCE>14
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: g632386g81k01.jpg

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    <SEQUENCE>15
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: g632386g81k02.jpg

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    <SEQUENCE>16
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: g632386g81k03.jpg

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    <SEQUENCE>17
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: g632386g81k04.jpg

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    <SEQUENCE>18
    <FILENAME>g632386photo_01mips.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: g632386photo_01mips.jpg

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    <SEQUENCE>19
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: g632386sig_01mips.jpg

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