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Reinsurance - Non-Traditional Long-Duration Contracts (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Non-traditional long-duration products |  |  |
Reinsurance |  |  |
Reinsurance ceded | $ 188 | $ 180 | $ 165

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