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Financing Arrangements - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Jun. 15, 2019
Jun. 14, 2019
Debt Instrument [Line Items]          
Asset coverage per ratio 185.00%   183.00%    
Amount Outstanding $ 7,968   $ 8,223    
Average outstanding amount $ 8,214 $ 8,842      
Weighted average interest rate 5.43% 5.00%      
Effective interest rate percentage 5.35% 5.08%      
Investment Advisory Agreement | FS/KKR Advisor, LLC          
Debt Instrument [Line Items]          
Asset coverage per ratio       150.00% 200.00%