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Future Policy Benefits - Summary of Balances and Changes in the Deferred Profit Liability (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Immediate Annuities        
Liability for Future Policy Benefit, Activity [Line Items]        
Balance, beginning of year $ 69 $ 57 $ 22  
Effect of modeling changes   4 0 $ 0
Effect of changes in cash flow assumptions   0 0 0
Effect of actual variances from expected experience   16 16 39
Balance adjusted for variances from expectation   89 73 61
Issuances 3 1 0  
Interest accrual 2 2 2  
Amortization (7) (7) (6)  
Balance, end of year 87 69 57  
PRT        
Liability for Future Policy Benefit, Activity [Line Items]        
Balance, beginning of year 4 7 0  
Effect of modeling changes   0 0 0
Effect of changes in cash flow assumptions   1 (2) 0
Effect of actual variances from expected experience   5 0 0
Balance adjusted for variances from expectation   10 5 $ 0
Issuances 0 0 7  
Interest accrual 1 0 0  
Amortization (1) (1) 0  
Balance, end of year $ 10 $ 4 $ 7