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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, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 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 | 0.08 |  |  |  |
Net investment income for period (in dollars per share) | 0.60 | 0.41 |  |  |  |
Net realized and unrealized (losses) for period (in dollars per share) | (0.07) | 0.03 |  |  |  |
Net increase in stockholders' equity (in dollars per share) | 0.53 | 0.52 |  |  |  |
Total distributions to stockholders (in dollars per share) | (0.48) | (0.45) |  |  |  |
Net asset value, end of period (in dollars per share) | 18.45 | 19.03 |  |  |  |
Per share market value at end of period (in dollars per share) | $ 18.27 | $ 20.95 | $ 18.47 |  |  | $ 21.19
Total return based on market value | 1.58% | 1.12% |  |  |  |
Total return based on net asset value | 2.88% | 2.74% |  |  |  |
Shares outstanding at end of period (in shares) | 545 | 493 | 519 |  |  |
Ratio/Supplemental Data: |  |  |  |  |  |
Net assets at end of period | $ 10,049 | $ 9,379 | $ 9,555 | $ 9,436 | $ 9,335 | $ 8,868
Ratio of operating expenses to average net assets | 12.31% | 10.17% |  |  |  |
Ratio of net investment income to average net assets | 12.74% | 8.80% |  |  |  |
Portfolio turnover rate | 21.00% | 39.00% |  |  |  |

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