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Future Policy Benefit Reserves - Earned Premiums and Interest Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Insurance [Abstract] |  |  |
Earned premiums | $ 437 | $ 451 | $ 473
Interest expense | $ 741 | $ 760 | $ 763

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