    <SEC-DOCUMENT>0001193125-21-071105-index.html : 20210305
    <SEC-HEADER>0001193125-21-071105.hdr.sgml : 20210305
    <ACCEPTANCE-DATETIME>20210305132112
    ACCESSION NUMBER:		0001193125-21-071105
    CONFORMED SUBMISSION TYPE:	N-CSR
    PUBLIC DOCUMENT COUNT:		20
    CONFORMED PERIOD OF REPORT:	20201231
    FILED AS OF DATE:		20210305
    DATE AS OF CHANGE:		20210305
    EFFECTIVENESS DATE:		20210305

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			BLACKROCK CREDIT ALLOCATION INCOME TRUST
    		CENTRAL INDEX KEY:			0001379384
    		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:		21717652

    	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>d47808dncsr.htm
    <DESCRIPTION>BLACKROCK CREDIT ALLOCATION INCOME TRUST
    <TEXT>
    Document 1 - file: d47808dncsr.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>2
    <FILENAME>d47808dex99cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 302
    <TEXT>
    Document 2 - file: d47808dex99cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.906CERT
    <SEQUENCE>3
    <FILENAME>d47808dex99906cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 906
    <TEXT>
    Document 3 - file: d47808dex99906cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.SECTION19
    <SEQUENCE>4
    <FILENAME>d47808dex99section19.htm
    <DESCRIPTION>SECTION 19 NOTICES
    <TEXT>
    Document 4 - file: d47808dex99section19.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.PROXYPOL
    <SEQUENCE>5
    <FILENAME>d47808dex99proxypol.htm
    <DESCRIPTION>PROXY VOTING POLICY AND PROCEDURES
    <TEXT>
    Document 5 - file: d47808dex99proxypol.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.GLOBAL.CORP.GO
    <SEQUENCE>6
    <FILENAME>d47808dex99globalcorpgo.htm
    <DESCRIPTION>GLOBAL CORPORATE GOVERNANCE & ENGAGEMENT PRINCIPLES
    <TEXT>
    Document 6 - file: d47808dex99globalcorpgo.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.US.CORP.GOV
    <SEQUENCE>7
    <FILENAME>d47808dex99uscorpgov.htm
    <DESCRIPTION>CORPORATE GOVERNANCE AND PROXY VOTING GUIDELINES FOR U.S. SECURITIES
    <TEXT>
    Document 7 - file: d47808dex99uscorpgov.htm

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>g72151dsp03a.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: g72151dsp03a.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>g72151dsp03b.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: g72151dsp03b.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>g72151dsp06.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: g72151dsp06.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>g72151dsp09.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: g72151dsp09.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>g72151dsp15.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: g72151dsp15.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>g72151dsp172.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: g72151dsp172.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>g72151g42l24.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: g72151g42l24.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>g79332dsp0016.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: g79332dsp0016.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>g79332dsp0016b.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: g79332dsp0016b.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>g79332dsp017.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: g79332dsp017.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>g79332dsp031.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: g79332dsp031.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>g79332dsp32.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: g79332dsp32.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>g79332g12o04.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 20 - file: g79332g12o04.jpg

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