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Market Risk Benefits - Balances and Changes in Market Risk Benefit (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Market Risk Benefit [Line Items]    
Balance beginning of period $ 315  
Balance, end of period 356 $ 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 29 (10)
Attributed fees collected and interest accrual 71 131
Actual policyholder behavior different from expected 19 27
Changes in assumptions and other 8 29
Effects of market related movements (61) (70)
Balance, end of period, before effect of changes in the instrument-specific credit risk 275 209
Effect of changes in the instrument-specific credit risk 80 105
Balance, end of period $ 355 $ 314
Weighted-average attained age of policyholders weighted by total AV (years) 68 years 1 month 13 days 68 years 3 months 10 days
Net amount at risk $ 1,185 $ 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 14 days 72 years 7 months 2 days
Net amount at risk $ 2 $ 2