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Available-For-Sale Fixed Maturity Securities - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Fair Value	$ 55,408	$ 47,292
Securities purchased under agreements to resell	400	400
Securities purchased under agreements to resell, fair value of collateral	$ 815	$ 783
Debt securities, available-for-sale, unrealized loss position, percentage of investments in the top two designations for investment grade	94.00%	89.00%
Deposits
Debt Securities, Available-for-Sale [Line Items]
Fair Value	$ 66	$ 65
Bonds pledged | Bonds
Debt Securities, Available-for-Sale [Line Items]
Fair Value	$ 10,100	$ 8,800

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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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