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Investments (Components of other-than-temporary impairment losses recognized in earnings) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Debt Securities, Available-for-sale [Line Items] |  |
Impairment losses (gains) recognized in earnings | $ 7 | $ 14
Corporate and other bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Impairment losses (gains) recognized in earnings | 7 | 9
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Impairment losses (gains) recognized in earnings | $ 0 | $ 5

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