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Future Contract Benefit (Summary of Changes in Present values of Expected Net Premiums and LFPB) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Present Value of Expected LFBP [Abstract]      
Liability for Future Policy Benefits, Total $ 38,826 $ 41,425  
Traditional Life [Member]      
Present Value of Expected Net Premiums [Abstract]      
Balance as of beginning-of-period 6,858 6,086  
Beginning balance of original discount rate 5,975 4,849  
Effect of changes in cash flow assumptions   (484) $ (89)
Effect of actual variances from expected experience   50 277
Adjusted balance as of beginning-of-year 5,541 5,037  
Issuances 1,656 1,379  
Interest accrual 222 228  
Net premium collected (765) (647)  
Flooring impact of LFPB (9) (22)  
Ending balance of original discount rate 6,645 5,975  
Effect of cumulative changes in discount rate assumptions (582) 883  
Balance as of end-of-period 6,063 6,858  
Present Value of Expected LFBP [Abstract]      
Balance as of beginning-of-period 11,008 10,512  
Beginning balance of original discount rate 9,447 8,332  
Effect of changes in cash flow assumptions   (415) (95)
Effect of actual variances from expected experience   69 295
Adjusted balance as of beginning-of-period 9,101 8,532  
Issuance 1,655 1,379  
Interest accrual 356 362  
Benefit payments (755) (826)  
Ending balance of original discount rate 10,357 9,447  
Effect of changes in discount rate assumptions (785) 1,561  
Balance as of end-of-period 9,572 11,008  
Liability for Future Policy Benefits, Total 3,509 4,150  
Less: reinsurance recoverables 532 688  
Net balance as of end-of-period, net of reinsurance $ 2,977 $ 3,462  
Weighted-average duration of future policyholder benefit liability (years) 10 years 11 years  
Payout Annuities [Member]      
Present Value of Expected LFBP [Abstract]      
Balance as of beginning-of-period $ 2,512 $ 2,668  
Beginning balance of original discount rate 2,246 2,253  
Effect of actual variances from expected experience   3 (3)
Adjusted balance as of beginning-of-period 2,249 2,250  
Issuance 122 96  
Interest accrual 84 84  
Benefit payments (188) (184)  
Ending balance of original discount rate 2,267 2,246  
Effect of changes in discount rate assumptions (263) 266  
Balance as of end-of-period 2,004 2,512  
Liability for Future Policy Benefits, Total 2,004 2,512  
Less: reinsurance recoverables 3 3  
Net balance as of end-of-period, net of reinsurance $ 2,001 $ 2,509  
Weighted-average duration of future policyholder benefit liability (years) 9 years 11 years  
Deferred Profit Liability $ 38 $ 22 5
Ul and Other [Member]      
Present Value of Expected LFBP [Abstract]      
Balance as of beginning-of-period 12,556 12,308  
Balance as of beginning-of-year, excluding shadow balance in AOCI 11,443 10,375  
Effect of changes in cash flow assumptions   3,108 (115)
Effect of actual variances from expected experience   195 107
Adjusted balance as of beginning-of-period 14,746 10,367  
Issuance 7 2  
Interest accrual 626 498  
Net assessments collected 972 956  
Benefit payments (628) (380)  
Balance as of end-of-period, excluding shadow balance in AOCI 15,723 11,443  
Balance as of end-of-period 14,818 12,556  
Liability for Future Policy Benefits, Total 14,818 12,556  
Less: reinsurance recoverables 856 368  
Net balance as of end-of-period, net of reinsurance $ 13,962 $ 12,188  
Weighted-average duration of future policyholder benefit liability (years) 17 years 18 years  
Group Protection Segment [Member]      
Present Value of Expected LFBP [Abstract]      
Balance as of beginning-of-period $ 5,936 $ 5,939  
Beginning balance of original discount rate 5,674 5,422  
Effect of changes in cash flow assumptions   15 (31)
Effect of actual variances from expected experience   (117) $ (133)
Adjusted balance as of beginning-of-period 5,572 5,258  
Issuance 1,777 1,597  
Interest accrual 141 145  
Benefit payments (1,431) (1,326)  
Ending balance of original discount rate 6,059 5,674  
Effect of changes in discount rate assumptions (597) 262  
Balance as of end-of-period 5,462 5,936  
Liability for Future Policy Benefits, Total 5,462 5,936  
Less: reinsurance recoverables 127 150  
Net balance as of end-of-period, net of reinsurance 5,335 5,786  
Deferred Profit Liability $ 4 $ 5