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INVESTMENTS - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($)
Debt Securities, Available-for-Sale [Line Items] |  |  |
Reclassification of specific investments from fixed maturity securities, available for sale at fair value to fixed maturity securities, held to maturity at amortized cost net of credit allowances | $ 0 | $ 722 | $ 0
Unrealized loss from transfer | 42 |  |
Aggregate market value of investments in unrealized loss position | 14,789 | 19,647 |
Gross unrealized losses on investments in unrealized loss position | 1,137 | 1,982 |
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation | 102 | 1,217 |
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation | 1,035 | 764 |
Additional contractual commitments | 2,800 |  |
Other invested assets | $ 1,300 | $ 939 |
Number of securities held as primary beneficiary | security | 0 | 0 |
Securities, carrying value | $ 1,400 |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Maximum exposure to loss | 4,800 | $ 4,100 |
Commitments to fund investments | $ 2,100 |  |
Investments, Debt Securities Benchmark | Issuer Concentration Risk | Issuer One |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Percentage threshold of unrealized losses not exceeded by any one single issuer | 3.00% | 5.20% |
Investments, Debt Securities Benchmark | Issuer Concentration Risk | Issuer Two |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Percentage threshold of unrealized losses not exceeded by any one single issuer | 0.70% | 0.20% |
Fixed maturity securities |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation |  | $ 1,200 |
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation | $ 1,000 | 764 |
Investment Grade |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation | 86 | 1,100 |
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation | $ 1,000 | $ 732 |

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