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Investments (Components of Net Investment Gains (Losses)) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Net Investment Gains (Losses) [Line Items] |  |
Net investment gains (losses) | $ (42) | $ (96)
Fixed maturity securities |  |
Net Investment Gains (Losses) [Line Items] |  |
Net investment gains (losses) | (38) | (76)
Equity securities |  |
Net Investment Gains (Losses) [Line Items] |  |
Net investment gains (losses) | 1 | (3)
Mortgage loans |  |
Net Investment Gains (Losses) [Line Items] |  |
Net investment gains (losses) | $ (5) | $ (17)

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