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Investments - Reverse Repurchase Agreements and Other Collateral Transactions (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Schedule of Investments [Line Items]
Securities for Reverse Repurchase Agreements	$ 0	$ 10
US Treasury Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Restricted	$ 1	$ 7

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Amount of restricted 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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- Details

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