v3.25.2
FINANCIAL HIGHLIGHTS - Financial Highlights (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Investment Company, Financial Highlights [Roll Forward]              
Net asset value, beginning of period (in dollars per share) $ 19.89 $ 19.24          
Issuances of common stock (in dollars per share) 0.09 0.04          
Conversion of 2024 Convertible Notes (in dollars per share) 0 0.01          
Net investment income for period (in dollars per share) 1.03 1.17          
Net realized and unrealized gains (losses) for period (in dollars per share) (0.15) 0.11          
Net increase in stockholders' equity resulting from operations (in dollars per share) 0.97 1.33          
Total distributions to stockholders (in dollars per share) (0.96) (0.96)          
Net asset value, end of period (in dollars per share) 19.90 19.61          
Per share market value at end of period (in dollars per share) $ 21.96 $ 20.84   $ 21.89     $ 20.03
Total return based on market value 4.87% 9.02%          
Total return based on net asset value 4.95% 6.98%          
Shares outstanding at end of period (in shares) 706 630   672      
Ratio/Supplemental Data:              
Net assets at end of period $ 14,034 $ 12,364 $ 13,672 $ 13,355 $ 12,773 $ 11,872 $ 11,201
Ratio of operating expenses to average net assets 11.12% 12.31%          
Ratio of net investment income to average net assets 10.42% 12.13%          
Portfolio turnover rate 34.00% 37.00%