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INCOME AND EXCISE TAXES - Summary of Dividends Paid Per Common Share (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |
Ordinary income (in dollars per share) | $ 1.92 | $ 1.80 | $ 1.62 |  |  |  |  |  |  |
Capital gains (in dollars per share) | 0 | 0.07 | 0 |  |  |  |  |  |  |
Total (in dollars per share) | 1.92 | 1.87 | 1.62 | $ 1.60 | $ 1.68 | $ 1.54 | $ 1.52 | $ 1.52 | $ 1.57 | $ 1.57
Dividend income per share (in dollars per share) | $ 0.0296 | $ 0.0582 | $ 0.0461 |  |  |  |  |  |  |
Dividend Concentration Risk | Dividends | Interest-Related Dividends |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |
Composition, percent of fair value | 80.50% | 76.60% | 84.60% |  |  |  |  |  |  |

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