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FINANCIAL HIGHLIGHTS - Schedule of Financial Highlights (Details) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Investment Company, Financial Highlights [Roll Forward] |  |  |  |  |  |  |  |
Net asset value, beginning of period (in dollars per share) | $ 18.96 | $ 16.97 |  |  |  |  |  |
Issuances of common stock (in dollars per share) | 0.10 | 0.07 |  |  |  |  |  |
Net investment income for period (in dollars per share) | 1.51 | 1.13 |  |  |  |  |  |
Net realized and unrealized (losses) for period (in dollars per share) | (0.65) | 1.56 |  |  |  |  |  |
Net increase in stockholders' equity (in dollars per share) | 0.96 | 2.76 |  |  |  |  |  |
Total distributions to stockholders (in dollars per share) | (1.36) | (1.21) |  |  |  |  |  |
Net asset value, end of period (in dollars per share) | 18.56 | 18.52 |  |  |  |  |  |
Per share market value at end of period (in dollars per share) | $ 16.88 | $ 20.33 |  |  | $ 21.19 |  |  | $ 16.89
Total return based on market value | (14.44%) | 27.53% |  |  |  |  |  |
Total return based on net asset value | 2.74% | 20.87% |  |  |  |  |  |
Shares outstanding at end of period (in shares) | 508,000,000 | 461,000,000 |  |  | 468,000,000 |  |  |
Ratio/Supplemental Data: |  |  |  |  |  |  |  |
Total stockholders’ equity | $ 9,436 | $ 8,537 | $ 9,335 | $ 9,379 | $ 8,868 | $ 8,078 | $ 7,632 | $ 7,176
Ratio of operating expenses to average net assets | 9.77% | 4.32% |  |  |  |  |  |
Ratio of net investment income to average net assets | 10.73% | 3.13% |  |  |  |  |  |
Portfolio turnover rate | 36.00% | 54.00% |  |  |  |  |  |

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