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Separate Accounts (Schedule of Reconcilation of Separate Account Liabilities) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Separate Account Investment [Line Items] |  |
Balance as of beginning-of-year | $ 182,583 |
Balance as of end-of-year | 143,536 | $ 182,583
Ul and Other [Member] |  |
Fair Value, Separate Account Investment [Line Items] |  |
Balance as of beginning-of-year | 24,785 | 20,952
Gross Deposit | 1,900 | 1,786
Withdrawal | (454) | (441)
Policyholder assessments | (938) | (865)
Change in market performance | (4,371) | 3,470
Net transfers from (to) general account | (2) | (117)
Balance as of end-of-year | 20,920 | 24,785
Cash surrender value | 18,666 | 22,614
Variable Annuities [Member] |  |
Fair Value, Separate Account Investment [Line Items] |  |
Balance as of beginning-of-year | 136,665 | 128,121
Gross Deposit | 3,371 | 5,220
Withdrawal | (9,238) | (11,499)
Policyholder assessments | (2,603) | (2,836)
Change in market performance | (23,194) | 16,990
Net transfers from (to) general account | 572 | 669
Balance as of end-of-year | 105,573 | 136,665
Cash surrender value | 103,987 | 134,896
Retirement Plan Services Segment [Member] |  |
Fair Value, Separate Account Investment [Line Items] |  |
Balance as of beginning-of-year | 21,068 | 18,809
Gross Deposit | 2,378 | 2,294
Withdrawal | (2,378) | (2,970)
Policyholder assessments | (164) | (185)
Change in market performance | (3,710) | 3,245
Net transfers from (to) general account | (198) | (125)
Balance as of end-of-year | 16,996 | 21,068
Cash surrender value | 16,982 | 21,049
Other Operations [Member] |  |
Fair Value, Separate Account Investment [Line Items] |  |
Balance as of beginning-of-year | 65 |
Balance as of end-of-year | $ 47 | $ 65

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