Cover Notes to Financial Statements

Cover Page	Dec. 16, 2024
Document Information [Line Items]
Amendment Flag	false
Entity Central Index Key	0001736035
Document Type	8-K
Document Period End Date	Dec. 16, 2024
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, Address Line Two	31st Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
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

N-2	Dec. 16, 2024 USD ($)
Cover [Abstract]
Entity Central Index Key	0001736035
Amendment Flag	false
Securities Act File Number	814-01299
Document Type	8-K
Entity Registrant Name	Blackstone Secured Lending Fund
Entity Address, Address Line One	345 Park Avenue
Entity Address, Address Line Two	31st Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10154
City Area Code	(212)
Local Phone Number	503-2100
Entity Emerging Growth Company	false
Capital Stock, Long-Term Debt, and Other Securities [Abstract]
Long Term Debt [Table Text Block]	On December 16, 2024, Blackstone Secured Lending Fund (the “ Fund ”) issued $300,000,000 aggregate principal amount of 5.350% notes due 2028 (the “ New Notes ”) pursuant to that certain Indenture, dated as of July 15, 2020 (as may be further amended, supplemented or otherwise modified from time to time, the “ Base Indenture ”), as supplemented by the Seventh Supplemental Indenture (the “ Seventh Supplemental Indenture ” and, together with the Base Indenture, the “ Indenture ”), between the Fund and U.S. Bank Trust Company, National Association (the “ Trustee ”). The New Notes are a further issuance of the 5.350% Notes due 2028 that the Fund issued on October 15, 2024 in the aggregate principal amount of $400,000,000 (the “ Existing Notes ” and, together with the New Notes, the “ Notes ”). The New Notes will be treated as a single series with the Existing Notes under the Indenture governing the Notes and will have the same terms as the Existing Notes (except the issue date and offering price). The New Notes will have the same CUSIP number and will be fungible and rank equally with the Existing Notes. Upon the issuance of the New Notes, the outstanding aggregate principal amount of the 5.350% Notes due 2028 will be $700,000,000.
Long Term Debt, Principal	$ 300,000,000
Long Term Debt, Structuring [Text Block]	The Notes will mature on April 13, 2028 and may be redeemed in whole or in part at the Fund’s option at any time and from time to time at the redemption prices set forth in the Indenture. The Notes bear interest at a rate of 5.350% per year payable semi-annually on April 13 and October 13 of each year, commencing on April 13, 2025. The Notes are general unsecured obligations of the Fund that rank senior in right of payment to all of the Fund’s existing and future indebtedness that is expressly subordinated in right of payment to the Notes, rank pari passu with all existing and future unsecured indebtedness issued by the Fund that are not so subordinated, rank effectively junior to any of the Fund’s secured indebtedness (including unsecured indebtedness that the Fund later secures) to the extent of the value of the assets securing such indebtedness, and rank structurally junior to all existing and future indebtedness (including trade payables) incurred by the Fund’s subsidiaries, financing vehicles or similar facilities.
Long Term Debt, Dividends and Covenants [Text Block]	The Indenture contains certain covenants, including covenants requiring the Fund to comply with the asset coverage requirements of Section 18(a)(1)(A) as modified by Section 61(a) of the Investment Company Act of 1940, as amended, whether or not it is subject to those requirements, and to provide financial information to the holders of the Notes and the Trustee if the Fund is no longer subject to the reporting requirements under the Securities Exchange Act of 1934, as amended. These covenants are subject to important limitations and exceptions that are described in the Indenture.