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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items] |  |  |
Gross investment income before adjustments | $ 1,989 | $ 1,477 | $ 890
Funds held interest income (expense) | 26 | 10 | 2
Future policy benefit reserve income (expense) | (1) | (1) | 0
Gross investment income | 2,013 | 1,486 | 892
Investment expenses | 59 | 53 | 62
Net investment income | 1,954 | 1,434 | 830
Fixed maturities |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Gross investment income before adjustments | 1,481 | 1,153 | 742
Equity securities |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Gross investment income before adjustments | 3 | 3 | 16
Short-term investments and cash |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Gross investment income before adjustments | 195 | 140 | 28
Limited partnerships |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Gross investment income before adjustments | 206 | 122 | 75
Other |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Gross investment income before adjustments | $ 104 | $ 59 | $ 29

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