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INVESTMENTS - Summary of Components of Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross investment income before adjustments | $ 416 | $ 167 | $ 1,056 | $ 661
Funds held interest income (expense) | 5 | 0 | 7 | 4
Future policy benefit reserve income (expense) | 0 | 0 | (1) | 0
Gross investment income | 420 | 167 | 1,063 | 665
Investment expenses | 14 | 15 | 41 | 45
Net investment income | 406 | 151 | 1,023 | 620
Fixed maturities |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross investment income before adjustments | 299 | 186 | 822 | 503
Equity securities |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross investment income before adjustments | 1 | 6 | 3 | 15
Short-term investments gain (loss) |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross investment income before adjustments | 41 | 5 | 92 | 12
Limited partnerships |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross investment income before adjustments | 60 | (42) | 98 | 94
Other |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross investment income before adjustments | $ 15 | $ 11 | $ 42 | $ 37

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