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Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2025
Feb. 20, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Securities Act File Number 814-00757    
Entity Registrant Name FS KKR Capital Corp.    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 26-1630040    
Entity Address, Address Line One 3025 JFK Boulevard    
Entity Address, Address Line Two OFC 500    
Entity Address, City or Town Philadelphia    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 19104    
City Area Code 215    
Local Phone Number 495-1150    
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol FSK    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 5.8
Entity Common Stock, Shares Outstanding   280,066,433  
Documents Incorporated by Reference
Portions of the registrant’s definitive Proxy Statement relating to the registrant’s 2026 Annual Meeting of Stockholders, to be filed with the U.S. Securities and Exchange Commission within 120 days following the end of the registrant’s fiscal year ended December 31, 2025, are incorporated by reference in Part III of this annual report on Form 10-K as indicated herein.
    
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Fiscal Year Focus 2025    
Entity Central Index Key 0001422183