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Future Policy Benefits (Details) (Narrative) - Other Segments - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Life Insurance Product Line [Member] |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Changes In Cash Flow Assumptions | $ 85 | $ 222
Future Policy Benefits Remeasurement Gain Loss After Reinsurance | 75 | 259
Insurance, Other [Member] |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Changes In Cash Flow Assumptions | 78 | 17
Future Policy Benefits Remeasurement Gain Loss After Reinsurance | $ 78 | $ 17

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