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FINANCIAL HIGHLIGHTS - Financial Highlights (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Investment Company, Financial Highlights [Roll Forward] |  |  |  |  |  |  |  |
Net asset value, beginning of period (in dollars per share) | $ 19.24 | $ 18.40 |  |  |  |  |  |
Issuances of common stock (in dollars per share) | 0.06 | 0.01 |  |  |  |  |  |
Conversion of 2024 Convertible Notes (in dollars per share) | 0.01 | 0 |  |  |  |  |  |
Net investment income for period (in dollars per share) | 1.70 | 1.68 |  |  |  |  |  |
Net realized and unrealized gains (losses) for period (in dollars per share) | 0.20 | 0.34 |  |  |  |  |  |
Net increase in stockholders' equity resulting from operations (in dollars per share) | 1.97 | 2.03 |  |  |  |  |  |
Total distributions to stockholders (in dollars per share) | (1.44) | (1.44) |  |  |  |  |  |
Net asset value, end of period (in dollars per share) | 19.77 | 18.99 |  |  |  |  |  |
Per share market value at end of period (in dollars per share) | $ 20.94 | $ 19.47 |  |  | $ 20.03 |  |  | $ 18.47
Total return based on market value | 12.12% | 13.81% |  |  |  |  |  |
Total return based on net asset value | 10.48% | 11.37% |  |  |  |  |  |
Shares outstanding at end of period (in shares) | 646 | 569 |  |  | 582 |  |  |
Ratio/Supplemental Data: |  |  |  |  |  |  |  |
Net assets at end of period | $ 12,773 | $ 10,815 | $ 12,364 | $ 11,872 | $ 11,201 | $ 10,354 | $ 10,049 | $ 9,555
Ratio of operating expenses to average net assets | 12.45% | 12.80% |  |  |  |  |  |
Ratio of net investment income to average net assets | 11.87% | 11.95% |  |  |  |  |  |
Portfolio turnover rate | 38.00% | 24.00% |  |  |  |  |  |

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