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Separate accounts (Separate account liabilities rollforward) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Separate Account, Liability [Line Items] |  |  |  |
Separate Account, Liability, Beginning Balance |  | $ 5,190 | $ 5,560 | $ 4,488
Acquisition of Cigna |  | 0 |  | 0
Separate Account, Liability, Premium and Deposit |  | 995 | 1,453 | 2,086
Separate Account, Liability, Policy Charge |  | (138) | (127) | (128)
Separate Account, Liability, Surrender and Withdrawal |  | (601) | (503) | (720)
Separate Account, Liability, Benefit Payment |  | (381) | (381) | (318)
Separate Account, Liability, Increase (Decrease) from Invested Performance |  | 611 | (848) | 312
Separate Account, Liability, Increase (Decrease) from Other Change |  | (103) | (265) | (160)
Separate Account, Liability, Ending Balance |  | 5,573 | 5,190 | 5,560
Separate Account, Liability, Cash Surrender Value, Amount | [1] | $ 5,398 | 4,989 | $ 5,309
Cigna's Life Insurance Business in Asian Markets |  |  |  |
Separate Account, Liability [Line Items] |  |  |  |
Acquisition of Cigna |  |  | $ 301 |
[1] | Cash surrender value represents the amount of the contract holder's account balances distributable at the balance sheet date less certain surrender charges

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