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Future Policy Benefits - Summary of Balances and Changes in the Deferred Profit Liability (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Immediate Annuities      
Liability for Future Policy Benefit, Activity [Line Items]      
Balance, beginning of year $ 87 $ 69  
Effect of modeling changes   0 $ 4
Effect of changes in cash flow assumptions   0 0
Effect of actual variances from expected experience   2 16
Balance adjusted for variances from expectation   89 89
Issuances 1 3  
Interest accrual 0 2  
Amortization (2) (7)  
Balance, end of year 88 87  
PRT      
Liability for Future Policy Benefit, Activity [Line Items]      
Balance, beginning of year 10 4  
Effect of modeling changes   0 0
Effect of changes in cash flow assumptions   (4) 1
Effect of actual variances from expected experience   2 5
Balance adjusted for variances from expectation   8 $ 10
Issuances 0 0  
Interest accrual 0 1  
Amortization 0 (1)  
Balance, end of year $ 8 $ 10