Principal Business and Organization	3 Months Ended
Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Principal Business and Organization	Principal Business and Organization FS KKR Capital Corp. (NYSE: FSK), or the Company, was incorporated under the general corporation laws of the State of Maryland on December 21, 2007 and formally commenced investment operations on January 2, 2009. The Company is an externally managed, non-diversified, closed-end management investment company that has elected to be regulated as a business development company, or BDC, under the Investment Company Act of 1940, as amended, or 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, or RIC, as defined under Subchapter M of the Internal Revenue Code of 1986, as amended, or the Code. The Company has various wholly-owned subsidiaries, including special-purpose financing subsidiaries and subsidiaries through which it holds interests in portfolio companies. The unaudited consolidated financial statements include both the Company’s accounts and the accounts of its wholly-owned subsidiaries as of March 31, 2025. All intercompany transactions have been eliminated in consolidation. Certain of the Company’s consolidated subsidiaries are subject to U.S. federal and state income taxes. The Company’s investment objectives are to generate current income and, to a lesser extent, long-term capital appreciation. The Company’s portfolio is comprised primarily of investments in senior secured loans and second lien secured loans of private middle-market U.S. companies and, to a lesser extent, subordinated loans and certain asset-based financing loans of private U.S. companies. In addition, a portion of the Company’s portfolio may be comprised of equity and equity-related securities, corporate bonds, structured products, other debt securities and derivatives, including total return swaps and credit default swaps. The Company is externally managed by FS/KKR Advisor, LLC, or the Adviser, pursuant to an investment advisory agreement, dated as of June 16, 2021, or the investment advisory agreement.

FS KKR Capital Corp. (NYSE: FSK), or the Company, was incorporated under the general corporation laws of the State of Maryland on December 21, 2007 and formally commenced investment operations on January 2, 2009. The Company is an externally managed, non-diversified, closed-end management investment company that has elected to be regulated as a business development company, or BDC, under the Investment Company Act of 1940, as amended, or 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, or RIC, as defined under Subchapter M of the Internal Revenue Code of 1986, as amended, or the Code. The Company has various wholly-owned subsidiaries, including special-purpose financing subsidiaries and subsidiaries through which it holds interests in portfolio companies. The unaudited consolidated financial statements include both the Company’s accounts and the accounts of its wholly-owned subsidiaries as of March 31, 2025. All intercompany transactions have been eliminated in consolidation. Certain of the Company’s consolidated subsidiaries are subject to U.S. federal and state income taxes.

The Company’s investment objectives are to generate current income and, to a lesser extent, long-term capital appreciation. The Company’s portfolio is comprised primarily of investments in senior secured loans and second lien secured loans of private middle-market U.S. companies and, to a lesser extent, subordinated loans and certain asset-based financing loans of private U.S. companies. In addition, a portion of the Company’s portfolio may be comprised of equity and equity-related securities, corporate bonds, structured products, other debt securities and derivatives, including total return swaps and credit default swaps.