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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, 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   4 16 39
Balance adjusted for variances from expectation   77 73 61
Issuances 1 1 0  
Interest accrual 1 2 2  
Amortization (2) (7) (6)  
Balance, end of year 77 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   0 (2) 0
Effect of actual variances from expected experience   0 0 0
Balance adjusted for variances from expectation   4 5 $ 0
Issuances 0 0 7  
Interest accrual 0 0 0  
Amortization 0 (1) 0  
Balance, end of year $ 4 $ 4 $ 7