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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 | Jun. 30, 2023 | Dec. 31, 2022
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Traditional Life [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future benefit payments, undiscounted | $ 13,834 | $ 13,640
Expected future gross premiums, undiscounted | 14,009 | 13,945
Expected future gross premiums, discounted | 9,583 | 9,475
Expected future benefit payments, Discounted | 9,763 | 9,572
Payout Annuities [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future benefit payments, undiscounted | 3,501 | 3,472
Expected future benefit payments, Discounted | 2,048 | 2,004
Group Protection [Member] |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future benefit payments, undiscounted | 7,111 | 7,063
Expected future benefit payments, Discounted | $ 6,070 | $ 6,059

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