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Separate accounts (Fair value of assets) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account assets | $ 6,810 | $ 6,231 | $ 5,996
Separate Account, Cash and Cash Equivalents |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account assets | 103 |  | 75
Fixed maturities |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account assets | 76 |  | 77
Mutual funds |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account assets | $ 6,631 |  | $ 5,844

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