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Financing Arrangements - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 17, 2025
Jun. 02, 2025
Nov. 22, 2019
Dec. 02, 2015
Feb. 20, 2014
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Nov. 14, 2022
Dec. 31, 2021
Jun. 15, 2019
Jun. 14, 2019
Debt Instrument [Line Items]                          
Asset coverage per ratio (as percent)           177.00% 190.00% 183.00% 180.00%   184.00%    
Amount outstanding           $ 7,620,000,000 $ 7,385,000,000 $ 8,223,000,000 $ 8,731,000,000   $ 9,179,000,000    
Amount outstanding           $ 8,069,000,000 $ 8,088,000,000            
Average outstanding           5.45% 5.51%            
Debt instrument, interest rate, effective percentage           5.08% 5.45%            
Realized loss on extinguishment of debt           $ 7,000,000 $ 0 $ 0          
CCT Tokyo Funding Credit Facility                          
Debt Instrument [Line Items]                          
Non usage fee (as percent)                   0.50%      
CCT Tokyo Funding Credit Facility | Secured Overnight Financing Rate (SOFR)                          
Debt Instrument [Line Items]                          
Basis spread on variable rate (as percent)       1.00%                  
CCT Tokyo Funding Credit Facility | Base Rate                          
Debt Instrument [Line Items]                          
Basis spread on variable rate (as percent)       0.00%                  
CCT Tokyo Funding Credit Facility | Base Rate | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Basis spread on variable rate (as percent)       1.05%                  
Line of Credit | Ambler Credit Facility | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Amount outstanding             $ 133,000,000            
Realized loss on extinguishment of debt $ 2,000,000                        
Basis spread on variable rate (as percent)             2.25%            
Line of Credit | Callowhill Street Funding LLC | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Line of credit facility, maximum borrowing capacity   $ 400,000,000                      
Basis spread on variable rate (as percent)   1.75%                      
Line of credit facility, commitment fee   0.50%                      
Line of Credit | CCT Tokyo Funding Credit Facility                          
Debt Instrument [Line Items]                          
Line of credit facility, maximum borrowing capacity       $ 300,000,000                  
Stated interest rate (as percent)       0.50%                  
Line of Credit | CCT Tokyo Funding Credit Facility | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Amount outstanding           $ 45,000,000 $ 147,000,000            
Line of credit facility, maximum borrowing capacity       $ 100,000,000                  
Line of Credit | CCT Tokyo Funding Credit Facility | Term Loan Advances                          
Debt Instrument [Line Items]                          
Line of credit facility, maximum borrowing capacity       $ 200,000,000                  
Line of Credit | CCT Tokyo Funding Credit Facility | Minimum | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Basis spread on variable rate (as percent)           1.90% 1.90%            
Line of Credit | CCT Tokyo Funding Credit Facility | Maximum | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Basis spread on variable rate (as percent)           2.05% 2.05%            
Line of Credit | CCT Tokyo Funding Credit Facility | Secured Overnight Financing Rate (SOFR) | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Debt instrument, interest rate, effective percentage       1.90%                  
Basis spread on variable rate (as percent)       2.05%                  
Line of Credit | CCT Tokyo Funding Credit Facility | Base Rate | Term Loan Advances                          
Debt Instrument [Line Items]                          
Debt instrument, interest rate, effective percentage       0.90%                  
Line of Credit | Darby Creek Credit Facility | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Amount outstanding             $ 500,000,000            
Realized loss on extinguishment of debt $ 3,000,000                        
Basis spread on variable rate (as percent)             2.65%            
Debt instrument, face amount         $ 750,000,000                
Line of Credit | Darby Creek Credit Facility | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Basis spread on variable rate (as percent)         2.65%                
Stated interest rate (as percent)         2.90%                
Line of Credit | Meadowbrook Run Credit Facility | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Amount outstanding           $ 265,000,000 $ 200,000,000            
Line of credit facility, maximum borrowing capacity     $ 400,000,000                    
Basis spread on variable rate (as percent)           1.95% 2.70%            
Debt instrument, face amount     $ 300,000,000                    
Line of Credit | Meadowbrook Run Credit Facility | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Basis spread on variable rate (as percent)     1.95%                    
Line of credit facility, commitment fee     70.00%                    
Stated interest rate (as percent)     2.45%                    
Line of Credit | Meadowbrook Run Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Non usage fee (as percent)     0.25%                    
Line of Credit | Meadowbrook Run Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Non usage fee (as percent)     0.65%                    
Investment Advisory Agreement | FS/KKR Advisor, LLC                          
Debt Instrument [Line Items]                          
Asset coverage per ratio (as percent)                       150.00% 200.00%