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INVESTMENTS - Schedule of Components of Net Gains (Losses) on 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] |  |  |
Total net gains (losses) on investments | $ (276) | $ (455) | $ 258
Fixed maturity securities |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Allowance for credit losses | 7 | (33) | (28)
Fixed maturity securities | Market Value |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Net realized gains (losses) from dispositions | (292) | (87) | 17
Fixed maturity securities | Fair Value |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Gains (losses) from fair value adjustments | 0 | 0 | 0
Equity securities: | Market Value |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Net realized gains (losses) from dispositions | 8 | 112 | 28
Equity securities: | Fair Value |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Gains (losses) from fair value adjustments | 0 | (460) | 236
Other invested assets |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Net realized gains (losses) from dispositions | 0 | 13 | 6
Short-term investments gain (loss) |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Net realized gains (losses) from dispositions | $ 0 | $ 0 | $ 0

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