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Separate accounts (Fair value of assets) (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023
--- | --- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account assets | $ 5,834 | $ 5,573 | $ 5,574
Separate Account, Cash and Cash Equivalents |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account assets | 100 |  | 98
Fixed maturities |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account assets | 85 |  | 94
Mutual funds |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account assets | $ 5,649 |  | $ 5,382

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