    <SEC-DOCUMENT>0001193125-17-332118-index.html : 20171103
    <SEC-HEADER>0001193125-17-332118.hdr.sgml : 20171103
    <ACCEPTANCE-DATETIME>20171103104207
    ACCESSION NUMBER:		0001193125-17-332118
    CONFORMED SUBMISSION TYPE:	N-CSR
    PUBLIC DOCUMENT COUNT:		20
    CONFORMED PERIOD OF REPORT:	20170831
    FILED AS OF DATE:		20171103
    DATE AS OF CHANGE:		20171103
    EFFECTIVENESS DATE:		20171103

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			BLACKROCK CORE BOND TRUST
    		CENTRAL INDEX KEY:			0001160864
    		IRS NUMBER:				522346891
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1031

    	FILING VALUES:
    		FORM TYPE:		N-CSR
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-10543
    		FILM NUMBER:		171175045

    	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
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>N-CSR
    <SEQUENCE>1
    <FILENAME>d442727dncsr.htm
    <DESCRIPTION>BLACKROCK CORE BOND TRUST
    <TEXT>
    Document 1 - file: d442727dncsr.htm

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    <TYPE>EX-99.CERT
    <SEQUENCE>2
    <FILENAME>d442727dex99cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 302
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    Document 2 - file: d442727dex99cert.htm

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    <TYPE>EX-99.906CERT
    <SEQUENCE>3
    <FILENAME>d442727dex99906cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 906
    <TEXT>
    Document 3 - file: d442727dex99906cert.htm

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    <TYPE>EX-99.PROXY.POL
    <SEQUENCE>4
    <FILENAME>d442727dex99proxypol.htm
    <DESCRIPTION>PROXY VOTING POLICY
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