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Financial Highlights - Schedule Of Financial Highlights (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Jun. 15, 2020
Dec. 31, 2025
USD ($)
$ / shares
shares
Sep. 30, 2025
$ / shares
Jun. 30, 2025
$ / shares
Mar. 31, 2025
$ / shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Sep. 30, 2024
$ / shares
Jun. 30, 2024
$ / shares
Mar. 31, 2024
$ / shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Jun. 16, 2021
Investment Company, Financial Highlights [Roll Forward]                              
Net asset value, beginning of year (in dollars per share)         $ 23.64       $ 24.46 $ 23.64 $ 24.46 $ 24.89 $ 27.17 $ 25.02  
Results of operations                              
Net investment income (loss) (in dollars per share)   $ 0.48 $ 0.57 $ 0.62 $ 0.67 $ 0.61 $ 0.77 $ 0.77 $ 0.76 2.34 2.90 3.18 3.05 2.76  
Net realized gain (loss) and unrealized appreciation (depreciation) (in dollars per share)                   (2.29) (0.82) (0.70) (2.74) 4.28  
Net increase (decrease) in net assets resulting from operations (in dollars per share)                   0.05 2.08 2.48 0.31 7.04  
Stockholder distributions                              
Distributions from net investment income (in dollars per share)                   (2.80) (2.90) (2.95) (2.66) (2.47)  
Distributions from net realized gain on investments (in dollars per share)                   0 0 0 0 0  
Net decrease in net assets resulting from stockholder distributions (in dollars per share)                   (2.80) (2.90) (2.95) (2.66) (2.47)  
Capital share transactions                              
Issuance of common stock (in dollars per share)                   0 0 0 0 (2.20)  
Repurchases of common stock (in dollars per share)                   0 0 0.04 0.07 0.01  
Deduction of deferred costs (in dollars per share)                   0 0 0 0 (0.23)  
Net increase (decrease) in net assets resulting from capital share transactions (in dollars per share)                   0 0 0.04 0.07 (2.42)  
Net asset value, end of year (in dollars per share)   20.89       23.64       20.89 23.64 24.46 24.89 27.17  
Per share market value, end of year (in dollars per share)   $ 14.81       $ 21.72       $ 14.81 $ 21.72 $ 19.97 $ 17.50 $ 20.94  
Shares outstanding, end of year (in shares) | shares   280,066,433       280,066,433       280,066,433 280,066,433 280,066,433 281,731,750 284,543,091  
Total return based on net asset value (as percent)                   0.21% 8.50% 10.12% 1.40% 18.47%  
Total return based on market value (as percent)                   (20.31%) 25.29% 32.45% (4.61%) 41.45%  
Ratio/Supplemental Data:                              
Net assets, end of year | $   $ 5,849       $ 6,622       $ 5,849 $ 6,622 $ 6,849 $ 7,012 $ 7,730  
Ratio of net investment income to average net assets (as percent)                   10.22% 11.90% 12.67% 11.42% 10.36%  
Ratio of total operating expenses to average net assets (as percent)                   13.52% 13.29% 13.32% 10.96% 9.35%  
Ratio of net operating expenses to average net assets (as percent)                   13.52% 13.29% 13.32% 10.17% 8.82%  
Portfolio turnover                   41.19% 33.38% 12.14% 28.61% 49.82%  
Total amount of senior securities outstanding, exclusive of treasury securities | $   $ 7,620       $ 7,385       $ 7,620 $ 7,385 $ 8,223 $ 8,731 $ 9,179  
Asset coverage per ratio (as percent)   177.00%       190.00%       177.00% 190.00% 183.00% 180.00% 184.00%  
Stock split conversion ratio 0.25                            
4.250% Unsecured Notes due 2025 | Unsecured Notes                              
Ratio/Supplemental Data:                              
Total amount of senior securities outstanding, exclusive of treasury securities | $           $ 475         $ 475        
Stated interest rate (as percent)           4.25%         4.25%   4.25%   4.25%