v3.26.1
Financing Arrangements - Narrative (Details)
€ in Millions, £ in Millions, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 29, 2026
USD ($)
Jun. 08, 2026
USD ($)
May 08, 2026
USD ($)
May 07, 2026
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Jun. 30, 2026
EUR (€)
Jun. 30, 2026
GBP (£)
Jun. 30, 2026
AUD ($)
Dec. 31, 2025
EUR (€)
Dec. 31, 2025
GBP (£)
Dec. 31, 2025
AUD ($)
Jun. 15, 2019
Jun. 14, 2019
Debt Instrument [Line Items]                                  
Asset coverage per ratio (as percent)         179.00%   179.00%     179.00% 179.00% 179.00%          
Long term outstanding         $ 6,641,000,000 $ 8,022,000,000 $ 6,641,000,000 $ 8,022,000,000 $ 7,620,000,000                
Senior securities, asset coverage ratio (as percent)         177.00% 177.00% 177.00% 177.00%   177.00% 177.00% 177.00%          
Average outstanding amount             $ 7,358,000,000 $ 8,212,000,000                  
Weighted average interest rate (as percent)         5.31% 5.51% 5.31% 5.51%   5.31% 5.31% 5.31%          
Effective interest rate percentage (as percent)         5.49% 5.34% 5.49% 5.34%   5.49% 5.49% 5.49%          
Realized loss on extinguishment of debt         $ 2,000,000 $ 3,000,000 $ 2,000,000 $ 3,000,000                  
Unsecured Notes                                  
Debt Instrument [Line Items]                                  
Redemption price percentage of principal (as percent)   100.00%                              
7.500% Notes due 2031 | Unsecured Notes                                  
Debt Instrument [Line Items]                                  
Long term outstanding         $ 900,000,000   $ 900,000,000                    
Stated interest rate (as percent)   7.50%     7.50% 7.50% 7.50% 7.50%   7.50% 7.50% 7.50%          
Principal amount   $ 900,000,000                              
Senior Secured Revolving Credit Facility | Revolving Credit Facility                                  
Debt Instrument [Line Items]                                  
Long term outstanding                       $ 6 € 361 £ 180 $ 3    
Senior Secured Revolving Credit Facility | Line of Credit | Revolving Credit Facility                                  
Debt Instrument [Line Items]                                  
Long term outstanding         $ 733,000,000   $ 733,000,000   1,533,000,000 € 348 £ 73            
Maximum borrowing capacity     $ 4,700,000,000 $ 4,051,700,000                          
Minimum shareholders' equity amount of net asset value     $ 3,750,000,000 $ 5,048,600,000                          
Senior Secured Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Lender Other Than Non-Extending Lenders, Alternate Base Rate, Greater Than Or Equal To | Greater Than Gross Borrowing Base                                  
Debt Instrument [Line Items]                                  
Borrowing rate test threshold     1.60                            
Basis spread on variable rate (as percent)     0.775% 0.65%                          
Senior Secured Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Lender Other Than Non-Extending Lenders, Term Benchmark, Less Than | Greater Than Gross Borrowing Base                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate (as percent)     1.775%                            
Senior Secured Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Lender Other Than Non-Extending Lenders, Term Benchmark, Less Than | Less Than Gross Borrowing Base                                  
Debt Instrument [Line Items]                                  
Borrowing rate test threshold     1.60                            
Basis spread on variable rate (as percent)     1.90%                            
Senior Secured Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Lender Other Than Non-Extending Lenders, Term Benchmark, Greater Than Or Equal To | Greater Than Gross Borrowing Base                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate (as percent)       1.65%                          
Senior Secured Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Lender Other Than Non-Extending Lenders, Term Benchmark, Greater Than Or Equal To | Less Than Gross Borrowing Base                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate (as percent)       1.775%                          
Senior Secured Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Lender Other Than Non-Extending Lenders, Alternate Base Rate, Less Than | Less Than Gross Borrowing Base                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate (as percent)     0.90% 0.775%                          
CCT Tokyo Funding Credit Facility | Line of Credit | Revolving Credit Facility                                  
Debt Instrument [Line Items]                                  
Long term outstanding                 45,000,000                
Realized loss on extinguishment of debt $ 0                                
Meadowbrook Run Credit Facility | Line of Credit | Revolving Credit Facility                                  
Debt Instrument [Line Items]                                  
Long term outstanding                 $ 265,000,000                
Basis spread on variable rate (as percent)                 1.95%                
Realized loss on extinguishment of debt $ 2,000,000                                
Investment Advisory Agreement | FS/KKR Advisor, LLC                                  
Debt Instrument [Line Items]                                  
Asset coverage per ratio (as percent)                               150.00% 200.00%