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INVESTMENTS - Schedule of Components of Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross investment income before adjustments | $ 504 | $ 416 | $ 1,506 | $ 1,056
Funds held interest income (expense) | 5 | 5 | 20 | 7
Future policy benefit reserve income (expense) | 1 | 0 | 0 | (1)
Gross investment income | 510 | 420 | 1,525 | 1,063
Investment expenses | 13 | 14 | 44 | 41
Net investment income | 496 | 406 | 1,481 | 1,023
Fixed maturities |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross investment income before adjustments | 378 | 299 | 1,099 | 822
Equity securities |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross investment income before adjustments | 1 | 1 | 3 | 3
Short-term investments and cash |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross investment income before adjustments | 54 | 41 | 135 | 92
Limited partnerships |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross investment income before adjustments | 36 | 60 | 183 | 98
Other |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross investment income before adjustments | $ 36 | $ 15 | $ 85 | $ 42

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