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Document And Entity Information
Oct. 14, 2025
Document Information [Line Items]  
Entity Central Index Key 0001736035
Document Type 8-K
Document Period End Date Oct. 14, 2025
Entity Registrant Name Blackstone Secured Lending Fund
Entity Incorporation, State or Country Code DE
Securities Act File Number 814-01299
Entity Tax Identification Number 82-7020632
Entity Address, Address Line One 345 Park Avenue
Entity Address, State or Province NY
Entity Address, City or Town New York
Entity Address, Postal Zip Code 10154
City Area Code (212)
Local Phone Number 503-2100
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Shares of Beneficial Interest, $0.001 par value per share
Trading Symbol BXSL
Security Exchange Name NYSE
Entity Emerging Growth Company false
Amendment Flag false