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Future Contract Benefit (Summary of Reconciliation of Future Contract Benefits) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Liability for Future Policy Benefit, Activity [Line Items] |  |
Future contract benefits | $ 39,711 | $ 38,826
Traditional Life [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Future contract benefits | 3,676 | 3,509
Payout Annuities [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Future contract benefits | 2,048 | 2,004
UL and Other [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Future contract benefits | 15,525 | 14,818
Group Protection [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Future contract benefits | 5,493 | 5,462
Other Operations [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Future contract benefits | 9,707 | 9,782
Other Operations [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Future contract benefits | 3,262 | 3,251
Protective [Member] | Other Operations [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Future contract benefits | 5,500 | 5,400
Swiss Re [Member] | Other Operations [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Future contract benefits | $ 2,200 | $ 2,300

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