Organization	9 Months Ended
Organization	Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization Blackstone Secured Lending Fund (together with its consolidated subsidiaries, the “Company”), is a Delaware statutory trust formed on March 26, 2018, and structured as an externally managed, non-diversified, closed-end management investment company. On October 26, 2018, the Company elected to be regulated as a business development company (a “BDC”) under the Investment Company Act of 1940, as amended (together with the rules and regulations promulgated thereunder, the “1940 Act”). In addition, the Company has elected to be treated for U.S. federal income tax purposes, and intends to qualify annually, as a regulated investment company (a “RIC”), under Subchapter M of the Internal Revenue Code of 1986, as amended (together with the rules and regulations promulgated thereunder, the “Code”). The Company is externally managed by Blackstone Private Credit Strategies LLC (the “Adviser”), and Blackstone Credit BDC Advisors LLC (the “Sub-Adviser” and, together with the Adviser, the “Advisers”). The Advisers are affiliates of Blackstone Alternative Credit Advisors LP (the “Sub-Administrator” and, collectively with its affiliates in the credit, asset-based finance and insurance asset management business unit of Blackstone Inc. (“Blackstone”), “Blackstone Credit & Insurance,” or “BXCI”). Additionally, Blackstone Private Credit Strategies LLC, in its capacity as the administrator to the Company (in such capacity, the “Administrator” and, together with the Sub-Administrator, the “Administrators”), and the Sub-Administrator provide certain administrative and other services necessary for the Company to operate pursuant to an administration agreement between the Administrator and the Company (the “Administration Agreement”) and a sub-administration agreement between the Administrator and the Sub-Administrator (the “Sub-Administration Agreement,” and together with the Administration Agreement, the “Administration Agreements”), respectively. From commencement through December 31, 2024, Blackstone Credit BDC Advisors LLC served as the Company’s investment adviser (in such capacity, the “Prior Adviser”) and Blackstone Alternative Credit Advisors LP served as the Company’s administrator (in such capacity, the “Prior Administrator”). The Company’s investment objectives are to generate current income and, to a lesser extent, long-term capital appreciation. The Company seeks to achieve its investment objectives primarily through originated loans and other securities, including syndicated loans, of private U.S. companies, typically in the form of first lien senior secured and unitranche loans (including first out/last out loans), and to a lesser extent, second lien, third lien, unsecured and subordinated loans and other debt and equity securities. The Company commenced its loan origination and investment activities on November 20, 2018. On October 28, 2021, the Company priced its initial public offering (“IPO”), and the Company’s common shares of beneficial interest (“Common Shares”) began trading on the New York Stock Exchange (“NYSE”). See “Note 9. Net Assets” for further details.

Blackstone Secured Lending Fund 10-Q