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INVESTMENTS - Schedule of Components of Net Investment Income (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] |  |  |
Gross investment income before adjustments | $ 1,477 | $ 890 | $ 1,208
Funds held interest income (expense) | 10 | 2 | 12
Future policy benefit reserve income (expense) | (1) | 0 | (1)
Gross investment income | 1,486 | 892 | 1,219
Investment expenses | 53 | 62 | 54
Net investment income | 1,434 | 830 | 1,165
Fixed maturities |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Gross investment income before adjustments | 1,153 | 742 | 561
Equity securities |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Gross investment income before adjustments | 3 | 16 | 17
Short-term investments and cash |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Gross investment income before adjustments | 140 | 28 | 1
Limited partnerships |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Gross investment income before adjustments | 122 | 75 | 565
Other |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Gross investment income before adjustments | $ 59 | $ 29 | $ 63

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