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INVESTMENTS - Summary of Components of Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross investment income before adjustments | $ 369 | $ 242 | $ 641 | $ 494
Funds held interest income (expense) | 2 | 1 | 2 | 4
Future policy benefit reserve income (expense) | 0 | 0 | 0 | 0
Gross investment income | 371 | 242 | 643 | 498
Investment expenses | 14 | 16 | 26 | 30
Net investment income | 357 | 226 | 617 | 469
Fixed maturities |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross investment income before adjustments | 276 | 169 | 523 | 317
Equity securities |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross investment income before adjustments | 1 | 5 | 2 | 9
Short-term investments gain (loss) |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross investment income before adjustments | 34 | 7 | 51 | 7
Limited partnerships |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross investment income before adjustments | 53 | 48 | 38 | 136
Other |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross investment income before adjustments | $ 6 | $ 14 | $ 27 | $ 26

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