    <SEC-DOCUMENT>0001736035-19-000014-index.html : 20191114
    <SEC-HEADER>0001736035-19-000014.hdr.sgml : 20191114
    <ACCEPTANCE-DATETIME>20191113194820
    ACCESSION NUMBER:		0001736035-19-000014
    CONFORMED SUBMISSION TYPE:	10-Q
    PUBLIC DOCUMENT COUNT:		9
    CONFORMED PERIOD OF REPORT:	20190930
    FILED AS OF DATE:		20191114
    DATE AS OF CHANGE:		20191113

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Blackstone / GSO Secured Lending Fund
    		CENTRAL INDEX KEY:			0001736035
    		IRS NUMBER:				000000000
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		10-Q
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	814-01299
    		FILM NUMBER:		191215870

    	BUSINESS ADDRESS:
    		STREET 1:		345 PARK AVENUE
    		STREET 2:		31ST FLOOR
    		CITY:			NEW YORK
    		STATE:			NY
    		ZIP:			10154
    		BUSINESS PHONE:		212-503-2100

    	MAIL ADDRESS:
    		STREET 1:		345 PARK AVENUE
    		STREET 2:		31ST FLOOR
    		CITY:			NEW YORK
    		STATE:			NY
    		ZIP:			10154
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>10-Q
    <SEQUENCE>1
    <FILENAME>bgsl-20190930x10q.htm
    <DESCRIPTION>10-Q
    <TEXT>
    Document 1 - file: bgsl-20190930x10q.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-10.1
    <SEQUENCE>2
    <FILENAME>bgsl-20190930xex101.htm
    <DESCRIPTION>EXHIBIT 10.1
    <TEXT>
    Document 2 - file: bgsl-20190930xex101.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-10.2
    <SEQUENCE>3
    <FILENAME>bgsl-20190930xex102.htm
    <DESCRIPTION>EXHIBIT 10.2
    <TEXT>
    Document 3 - file: bgsl-20190930xex102.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-10.3
    <SEQUENCE>4
    <FILENAME>bgsl-20190930xex103.htm
    <DESCRIPTION>EXHIBIT 10.3
    <TEXT>
    Document 4 - file: bgsl-20190930xex103.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-31.1
    <SEQUENCE>5
    <FILENAME>bgsl-20190930xex311.htm
    <DESCRIPTION>EXHIBIT 31.1
    <TEXT>
    Document 5 - file: bgsl-20190930xex311.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-31.2
    <SEQUENCE>6
    <FILENAME>bgsl-20190930xex312.htm
    <DESCRIPTION>EXHIBIT 31.2
    <TEXT>
    Document 6 - file: bgsl-20190930xex312.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-32.1
    <SEQUENCE>7
    <FILENAME>bgsl-20190930xex321.htm
    <DESCRIPTION>EXHIBIT 32.1
    <TEXT>
    Document 7 - file: bgsl-20190930xex321.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-32.2
    <SEQUENCE>8
    <FILENAME>bgsl-20190930xex322.htm
    <DESCRIPTION>EXHIBIT 32.2
    <TEXT>
    Document 8 - file: bgsl-20190930xex322.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>bnpamendmentimage11.gif
    <TEXT>
    Document 9 - file: bnpamendmentimage11.gif

    </DOCUMENT>
    </SEC-DOCUMENT>