v3.25.1
Cover
Jun. 02, 2025
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jun. 02, 2025
Entity File Number 814-00757
Entity Registrant Name FS KKR CAPITAL CORP
Entity Central Index Key 0001422183
Entity Tax Identification Number 26-1630040
Entity Incorporation, State or Country Code MD
Entity Address, Address Line One 201 Rouse Boulevard
Entity Address, City or Town Philadelphia
Entity Address, State or Province PA
Entity Address, Postal Zip Code 19112
City Area Code 215
Local Phone Number 495-1150
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common stock
Trading Symbol FSK
Security Exchange Name NYSE
Entity Emerging Growth Company false