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FINANCIAL HIGHLIGHTS - Schedule of Financial Highlights (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 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 convertible notes (in dollars per share) | 0.01 | 0 |  |  |  |
Net investment income for period (in dollars per share) | 0.55 | 0.60 |  |  |  |
Net realized and unrealized gains (losses) for period (in dollars per share) | 0.21 | (0.07) |  |  |  |
Net increase in stockholders' equity resulting from operations (in dollars per share) | 0.77 | 0.53 |  |  |  |
Total distributions to stockholders (in dollars per share) | (0.48) | (0.48) |  |  |  |
Net asset value, end of period (in dollars per share) | 19.53 | 18.45 |  |  |  |
Per share market value at end of period (in dollars per share) | $ 20.82 | $ 18.27 | $ 20.03 |  |  | $ 18.47
Total return based on market value | 6.44% | 1.58% |  |  |  |
Total return based on net asset value | 4.00% | 2.88% |  |  |  |
Shares outstanding at end of period (in shares) | 608 | 545 | 582 |  |  |
Ratio/Supplemental Data: |  |  |  |  |  |
Net assets at end of period | $ 11,872 | $ 10,049 | $ 11,201 | $ 10,815 | $ 10,354 | $ 9,555
Ratio of operating expenses to average net assets | 12.79% | 12.31% |  |  |  |
Ratio of net investment income to average net assets | 11.36% | 12.74% |  |  |  |
Portfolio turnover rate | 51.00% | 21.00% |  |  |  |

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