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Market risk benefits (MRB Roll-Forward) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Market Risk Benefit [Line Items]        
Market Risk Benefit, Liability, beginning of period     $ 771  
Market Risk Benefit, Liability, end of period $ 576   576  
Market risk benefits gains (losses) (29) $ (7) (8) $ (122)
Long-Duration Insurance, Other | Variable Annuity        
Market Risk Benefit [Line Items]        
Market Risk Benefit, Liability, beginning of period     771 800
Balance, beginning of period, before effect of changes in the instrument-specific credit risk     749 776
Interest rate changes     (87) 37
Effect of changes in equity markets     (83) (144)
Effect of changes in volatilities     (13) 31
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected     31 14
Effect of timing and all other     (33) (8)
Balance, end of period, before effect of changes in the instrument-specific credit risk 564 706 564 706
Effect of changes in the instrument-specific credit risk 12 16 12 16
Market Risk Benefit, Liability, end of period 576 722 576 722
Market Risk Benefit, Net Amount at Risk [1] $ 1,630 $ 2,048 1,630 2,048
Market Risk Benefits Other Gains (Losses)     $ (191) $ (192)
Weighted-average age of policyholders (years)     74 years 73 years
[1] The net amount at risk is defined as the present value of future claim payments assuming policy account values and guaranteed values are fixed at the valuation date, and reinsurance coverage ends at the earlier of the maturity of the underlying variable annuity policy or the reinsurance treaty. No withdrawals, lapses, and mortality improvements are assumed in the projection. GLB-related risks contain conservative mortality and annuitization assumptions.