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Investments in Available-for-sale Fixed Maturity Securities - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
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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Debt Securities, Available-for-Sale, Unrealized Loss Position, Investment Grade Rating, Top Two Designations, Percentage

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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