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Future Contract Benefits - Summary of Changes in Present Values of Expected Net Premiums and LFPB (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Present Value of Expected LFPB      
Net balance as of end-of-period $ 39,807 $ 39,864  
Payout Annuities      
Present Value of Expected Net Premiums      
Balance as of beginning-of-year 0 0  
Beginning balance at original discount rate 0 0  
Effect of changes in cash flow assumptions   0 $ 0
Effect of actual variances from expected experience   0 0
Adjusted balance as of beginning-of-year 0 0  
Issuances 0 0  
Interest accrual 0 0  
Net premiums collected 0 0  
Flooring impact of LFPB 0 0  
Ending balance at original discount rate 0 0  
Effect of cumulative changes in discount rate assumptions 0 0  
Balance as of end-of-period 0 0  
Present Value of Expected LFPB      
Balance as of beginning-of-year 2,085 2,004  
Beginning balance at original discount rate 2,272 2,267  
Effect of changes in cash flow assumptions   0 0
Effect of actual variances from expected experience   2 1
Adjusted balance as of beginning-of-year   2,274 2,268
Issuances 102 109  
Interest accrual 87 86  
Benefit payments (203) (191)  
Ending balance at original discount rate 2,260 2,272  
Effect of cumulative changes in discount rate assumptions (251) (187)  
Balance as of end-of-period 2,009 2,085  
Net balance as of end-of-period 2,009 2,085  
Less: reinsurance recoverables 1,477 1,617  
Net balance as of end-of-period, net of reinsurance $ 532 $ 468  
Weighted-average duration of future policyholder benefit liability 9 years 9 years  
Deferred profit liability $ 62 $ 56 38
Payout Annuities | Cumulative Effect, Period of Adoption, Adjustment      
Present Value of Expected Net Premiums      
Balance as of beginning-of-year 0 0  
Balance as of end-of-period   0  
Present Value of Expected LFPB      
Balance as of beginning-of-year (187) (263)  
Balance as of end-of-period   (187)  
Traditional Life      
Present Value of Expected Net Premiums      
Balance as of beginning-of-year 6,200 6,063  
Beginning balance at original discount rate 6,348 6,645  
Effect of changes in cash flow assumptions   28 (12)
Effect of actual variances from expected experience   (53) (303)
Adjusted balance as of beginning-of-year 6,323 6,330  
Issuances 360 579  
Interest accrual 251 244  
Net premiums collected (785) (804)  
Flooring impact of LFPB (1) (1)  
Ending balance at original discount rate 6,148 6,348  
Effect of cumulative changes in discount rate assumptions (275) (148)  
Balance as of end-of-period 5,873 6,200  
Present Value of Expected LFPB      
Balance as of beginning-of-year 10,041 9,572  
Beginning balance at original discount rate 10,230 10,357  
Effect of changes in cash flow assumptions   (68) (29)
Effect of actual variances from expected experience   (70) (333)
Adjusted balance as of beginning-of-year   10,092 $ 9,995
Issuances 361 580  
Interest accrual 399 387  
Benefit payments (767) (732)  
Ending balance at original discount rate 10,085 10,230  
Effect of cumulative changes in discount rate assumptions (438) (189)  
Balance as of end-of-period 9,647 10,041  
Net balance as of end-of-period 3,774 3,841  
Less: reinsurance recoverables 385 445  
Net balance as of end-of-period, net of reinsurance $ 3,389 $ 3,396  
Weighted-average duration of future policyholder benefit liability 9 years 9 years  
Traditional Life | Cumulative Effect, Period of Adoption, Adjustment      
Present Value of Expected Net Premiums      
Balance as of beginning-of-year $ (148) $ (582)  
Balance as of end-of-period   (148)  
Present Value of Expected LFPB      
Balance as of beginning-of-year $ (189) (785)  
Balance as of end-of-period   $ (189)