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Investments (Supplemental Net Investment Gains (Losses)) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Net Investment Income [Line Items] |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ 30 | $ 41
Foreign Currency Transaction Gain (Loss), Realized | (45) | 41
Realized gains (losses) on investments sold or disposed (1) | (135) | (546)
Debt and Equity Securities, Realized Gain (Loss) | (67) | (508)
Net investment income |  |
Net Investment Income [Line Items] |  |
Debt and Equity Securities, Realized Gain (Loss) | 68 | 38
Equity Securities |  |
Net Investment Income [Line Items] |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ 31 | $ 40

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