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Available-For-Sale Fixed Maturity Securities - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Fair Value | $ 47,292 | $ 12,877
Securities purchased under agreements to resell | 400 | 0
Securities purchased under agreements to resell, fair value of collateral | $ 783 | $ 0
Debt securities, available-for-sale, unrealized loss position, investment grade rating, top two designations, percentage | 89.00% | 87.00%
Deposits |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Fair Value | $ 65 | $ 54
Bonds pledged | Bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Fair Value | $ 8,800 | $ 39

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