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Life Policy and Investment Contract Reserves (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Life Policy Reserves |  |  |
Liability for Future Policy Benefit, Activity |  |  |
Discount Rate Assumption Changes included in Impact of flooring at Cohort Level | $ 2 | $ 9 | $ 6

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