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Investments (Components of other-than-temporary impairment losses recognized in earnings) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Impairment losses (gains) recognized in earnings | $ 12 | $ 25 | $ 37 | $ 55
Corporate and other bonds |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Impairment losses (gains) recognized in earnings | 8 | 24 | 25 | 53
Asset-backed |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Impairment losses (gains) recognized in earnings | $ 4 | $ 1 | $ 12 | $ 2

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