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Future Contract Benefits - Summary of Changes in Present Values of Expected Net Premiums and LFPB (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Present Value of Expected LFPB        
Net balance as of end-of-period $ 38,560   $ 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 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 actual variances from expected experience     3 (2)
Adjusted balance as of beginning-of-year 2,275 2,265    
Issuances 39 69    
Interest accrual 43 43    
Benefit payments (98) (93)    
Ending balance at original discount rate 2,259 2,284    
Effect of cumulative changes in discount rate assumptions (257) (236)    
Balance as of end-of-period 2,002 2,048    
Net balance as of end-of-period 2,002 2,048 2,085  
Less: reinsurance recoverables 1,516 3    
Net balance as of end-of-period, net of reinsurance $ 486 $ 2,045    
Weighted-average duration of future policyholder benefit liability 9 years 9 years    
Deferred profit liability $ 61 $ 53    
Payout Annuities | Cumulative Effect, Period of Adoption, Adjustment        
Present Value of Expected Net Premiums        
Balance as of beginning-of-year 0 0    
Present Value of Expected LFPB        
Balance as of beginning-of-year (187) (263)    
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 actual variances from expected experience     (40) (276)
Adjusted balance as of beginning-of-year 6,308 6,369    
Issuances 206 330    
Interest accrual 125 120    
Net premiums collected (403) (406)    
Flooring impact of LFPB 2 1    
Ending balance at original discount rate 6,238 6,414    
Effect of cumulative changes in discount rate assumptions (321) (327)    
Balance as of end-of-period 5,917 6,087    
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 actual variances from expected experience     (45) $ (300)
Adjusted balance as of beginning-of-year 10,185 10,057    
Issuances 206 330    
Interest accrual 199 191    
Benefit payments (384) (343)    
Ending balance at original discount rate 10,206 10,235    
Effect of cumulative changes in discount rate assumptions (506) (472)    
Balance as of end-of-period 9,700 9,763    
Net balance as of end-of-period 3,783 3,676 $ 3,841  
Less: reinsurance recoverables 403 498    
Net balance as of end-of-period, net of reinsurance $ 3,380 $ 3,178    
Weighted-average duration of future policyholder benefit liability 9 years 10 years    
Traditional Life | Cumulative Effect, Period of Adoption, Adjustment        
Present Value of Expected Net Premiums        
Balance as of beginning-of-year $ (148) $ (582)    
Present Value of Expected LFPB        
Balance as of beginning-of-year $ (189) $ (785)