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Market risk benefits (MRB Roll-Forward) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jan. 01, 2021
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Market Risk Benefit [Line Items]          
Market Risk Benefit, Liability, beginning of period       $ 800  
Market Risk Benefit, Liability, end of period   $ 770   770  
Market risk benefits gains (losses)   (32) $ 69 (154) $ 85
Variable Annuity          
Market Risk Benefit [Line Items]          
Market Risk Benefit, Liability, end of period $ 1,163        
Long-Duration Insurance, Other | Variable Annuity          
Market Risk Benefit [Line Items]          
Market Risk Benefit, Liability, beginning of period       800 812
Balance, beginning of period, before effect of changes in the instrument-specific credit risk       776 755
Interest rate changes       (117) (561)
Effect of changes in equity markets       (69) 633
Effect of changes in volatilities       51 14
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption       89 40
Effect of timing and all other       19 (29)
Balance, end of period, before effect of changes in the instrument-specific credit risk   749 852 749 852
Effect of changes in the instrument-specific credit risk   21 9 21 9
Market Risk Benefit, Liability, end of period   770 861 $ 770 $ 861
Market risk benefit, weighted-average age of policyholders (age)       73 years 73 years
Market Risk Benefit, Net Amount at Risk   2,138 $ 2,885 $ 2,138 $ 2,885
Market Risk Benefits Other Gains (Losses)       $ (181) $ 186
Long-Duration Insurance, Other | Variable Annuity | Measurement Input, Annuitization Rate [Member]          
Market Risk Benefit [Line Items]          
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption   $ 92