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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