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Future Contract Benefit (Summary of Gross Premiums and Interest Accretion) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Traditional Life [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross assessments | $ 1,211 | $ 1,103
Interest Accretion | 134 | 134
Payout Annuities [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross assessments | 133 | 95
Interest Accretion | 84 | 84
Ul and Other [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross assessments | 2,818 | 3,150
Interest Accretion | 626 | 498
Group Protection Segment [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross assessments | 3,393 | 3,145
Interest Accretion | $ 141 | $ 145

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