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Separate accounts (Fair value of assets) (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024
--- | --- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account assets | $ 6,481 | $ 6,231 | $ 5,834
Separate Account, Cash and Cash Equivalents |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account assets | 131 |  | 100
Fixed maturities |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account assets | 82 |  | 85
Mutual funds |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account assets | $ 6,268 |  | $ 5,649

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