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Future Contract Benefit (Summary of Discounted and Undiscounted Expected Future Gross premiums and Expected Future Benefit Payments) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Traditional Life [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future benefit payments, undiscounted | $ 13,640 | $ 13,025
Expected future gross premiums, undiscounted | 13,945 | 14,658
Expected future gross premiums, discounted | 9,475 | 11,624
Expected future benefit payments, Discounted | 9,572 | 11,008
Payout Annuities [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future benefit payments, undiscounted | 3,472 | 3,467
Expected future benefit payments, Discounted | 2,004 | 2,512
Group Protection Segment [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future benefit payments, undiscounted | 7,063 | 6,663
Expected future benefit payments, Discounted | $ 6,059 | $ 5,674

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