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Separate accounts (Separate account liabilities rollforward) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Separate Account, Liability [Line Items]    
Separate Account, Liability, Beginning Balance $ 5,573 $ 5,190
Separate Account, Liability, Premium and Deposit 264 266
Separate Account, Liability, Policy Charge (43) (35)
Separate Account, Liability, Surrender and Withdrawal (210) (111)
Separate Account, Liability, Benefit Payment (105) (99)
Separate Account, Liability, Increase (Decrease) from Invested Performance 375 110
Separate Account, Liability, Increase (Decrease) from Other Change 10 (21)
Separate Account, Liability, Ending Balance 5,864 5,300
Separate Account, Liability, Cash Surrender Value, Amount [1] $ 5,655 $ 5,030
[1] Cash surrender value represents the amount of the contract holder's account balances distributable at the balance sheet date less certain surrender charges.