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Available-For-Sale Fixed Maturity Securities - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-Sale [Line Items] |  |
Available-for-sale fixed maturity securities, at fair value | $ 45,683 | $ 12,877
Securities purchased under agreements to resell | 400 | 0
Securities purchased under agreements to resell, fair value of collateral | $ 817 | $ 0
Debt securities, available-for-sale, unrealized loss position, percentage of investments in the top two designations for investment grade | 81.00% | 87.00%
Deposits |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available-for-sale fixed maturity securities, at fair value | $ 65 | $ 54
Bonds pledged | Bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available-for-sale fixed maturity securities, at fair value | $ 10,600 | $ 39

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