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Investments in Available-for-sale Fixed Maturity Securities - Narrative (Details) - USD ($) $ in Millions | Jun. 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 | $ 46,480 | $ 12,877
Debt securities, available-for-sale, unrealized loss position, percentage of investments in the top two designations for investment grade | 94.00% | 87.00%
Deposits |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available-for-sale fixed maturity securities, at fair value | $ 80 | $ 54
Bonds pledged | Bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available-for-sale fixed maturity securities, at fair value | $ 10,100 | $ 39

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