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Financing Arrangements - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2023
Apr. 27, 2023
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Debt Instrument [Line Items]          
Senior securities issued $ 8,190   $ 8,190   $ 8,731
Asset coverage per ratio 184.00%   184.00%   180.00%
Average outstanding amount     $ 8,744 $ 9,617  
Weighted average interest rate 5.13%   5.13% 3.18%  
Effective interest rate percentage 5.21%   5.21% 3.51%  
Darby Creek Credit Facility | Line of Credit          
Debt Instrument [Line Items]          
Commitment fee amount   $ 750      
Revolving Credit Facility | Darby Creek Credit Facility | Line of Credit          
Debt Instrument [Line Items]          
Senior securities issued $ 668   $ 668   $ 242
Revolving Credit Facility | Darby Creek Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR)          
Debt Instrument [Line Items]          
Basis spread on variable rate   2.65% 2.65%    
Revolving Credit Facility | Meadowbrook Run Credit Facility | Line of Credit          
Debt Instrument [Line Items]          
Senior securities issued $ 238   $ 238   $ 244
Revolving Credit Facility | Meadowbrook Run Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR)          
Debt Instrument [Line Items]          
Basis spread on variable rate 2.70%   2.70%   2.05%
Basis spread on variable rate, amortization period 3.20%        
Basis spread on variable rate, interest-only loan 0.15%