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INVESTMENTS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Aggregate market value of investments in unrealized loss position | $ 11,734 |  |  | $ 11,734 |  | $ 18,332
Gross unrealized losses on investments in unrealized loss position | 708 |  |  | 708 |  | 1,157
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation | 94 |  |  | 94 |  | 324
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation | 614 |  |  | 614 |  | 833
Additional contractual commitments | 2,500 |  |  | 2,500 |  |
Cash surrender value of life insurance | 1,800 |  |  | 1,800 |  | 1,700
Held to maturity, carrying amount, net |  |  |  | 11 |  |
Realized losses | 0 |  | $ 0 | 1 | $ 0 |
Partnership Interest |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Maximum exposure to loss | 3,800 |  |  | 3,800 |  | 3,600
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Commitments to fund investments | 1,500 |  |  | 1,500 |  |
Investment Grade |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation | 91 |  |  | 91 |  | 319
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation | 605 |  |  | 605 |  | 810
Fixed maturities |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation |  |  |  |  |  | 324
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation | $ 614 |  |  | $ 614 |  | $ 833
Issuer One | Investments, Debt Securities Benchmark | Issuer |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Percentage of overall fair value of fixed maturity securities available for sale, less than |  | 1.60% |  | 1.60% |  |
Issuer Two | Investments, Debt Securities Benchmark | Issuer |  |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |  |
Percentage of overall fair value of fixed maturity securities available for sale, less than |  | 0.90% |  | 0.60% |  |

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