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INVESTMENTS - Schedule of Changes in Net Unrealized Appreciation (Depreciation) for Company's Investments (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-Sale [Line Items] |  |  |
Change in unrealized appreciation (depreciation), pre-tax | $ 1,129 | $ (2,225) |
Deferred tax benefit (expense) | (142) | 277 |
Total URA(D) on securities arising during the period | 986 | (1,948) | $ (485)
Fixed maturity securities - available for sale and short-term investments |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Change in unrealized appreciation (depreciation), pre-tax | $ 1,129 | $ (2,225) |

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