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Market Risk Benefits - Balances and Changes in Market Risk Benefit (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Market Risk Benefit [Line Items]    
Balance beginning of period $ 315  
Balance, end of period 330 $ 315
Indexed Annuity    
Market Risk Benefit [Line Items]    
Balance beginning of period 314 164
Balance, beginning of period, before effect of changes in the instrument-specific credit risk 209 102
Issuances and benefit payments 12 (10)
Attributed fees collected and interest accrual 36 131
Actual policyholder behavior different from expected 8 27
Changes in assumptions and other (2) 29
Effects of market related movements (37) (70)
Balance, end of period, before effect of changes in the instrument-specific credit risk 226 209
Effect of changes in the instrument-specific credit risk 103 105
Balance, end of period $ 329 $ 314
Weighted-average attained age of policyholders weighted by total AV (years) 68 years 2 months 12 days 68 years 3 months 10 days
Net amount at risk $ 1,091 $ 1,059
Fixed Rate Annuities    
Market Risk Benefit [Line Items]    
Balance beginning of period 1 1
Balance, beginning of period, before effect of changes in the instrument-specific credit risk 1 1
Issuances and benefit payments 0 0
Attributed fees collected and interest accrual 0 0
Actual policyholder behavior different from expected 0 0
Changes in assumptions and other 0 0
Effects of market related movements 0 0
Balance, end of period, before effect of changes in the instrument-specific credit risk 1 1
Effect of changes in the instrument-specific credit risk 0 0
Balance, end of period $ 1 $ 1
Weighted-average attained age of policyholders weighted by total AV (years) 72 years 6 months 18 days 72 years 7 months 2 days
Net amount at risk $ 2 $ 2