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FINANCIAL HIGHLIGHTS - Schedule of Financial Highlights (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
Investment Company, Financial Highlights [Roll Forward] |  |  |  |  |  |  |  |
Net asset value, beginning of period (in dollars per share) | $ 18.40 | $ 18.96 |  |  |  |  |  |
Issuances of common stock (in dollars per share) | 0.01 | 0.10 |  |  |  |  |  |
Net investment income for period (in dollars per share) | 1.68 | 1.51 |  |  |  |  |  |
Net realized and unrealized gains (losses) for period (in dollars per share) | 0.34 | (0.65) |  |  |  |  |  |
Net increase in stockholders' equity (in dollars per share) | 2.03 | 0.96 |  |  |  |  |  |
Total distributions to stockholders (in dollars per share) | (1.44) | (1.36) |  |  |  |  |  |
Net asset value, end of period (in dollars per share) | 18.99 | 18.56 |  |  |  |  |  |
Per share market value at end of period (in dollars per share) | $ 19.47 | $ 16.88 |  |  | $ 18.47 |  |  | $ 21.19
Total return based on market value | 13.81% | (14.44%) |  |  |  |  |  |
Total return based on net asset value | 11.37% | 5.15% |  |  |  |  |  |
Shares outstanding at end of period (in shares) | 569 | 508 |  |  | 519 |  |  |
Ratio/Supplemental Data: |  |  |  |  |  |  |  |
Net assets at end of period | $ 10,815 | $ 9,436 | $ 10,354 | $ 10,049 | $ 9,555 | $ 9,335 | $ 9,379 | $ 8,868
Ratio of operating expenses to average net assets | 12.80% | 9.77% |  |  |  |  |  |
Ratio of net investment income to average net assets | 11.95% | 10.73% |  |  |  |  |  |
Portfolio turnover rate | 24.00% | 36.00% |  |  |  |  |  |

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