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Investments (Supplemental Net Investment Gains (Losses)) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Net Investment Income [Line Items] |  |  |  |
Changes in estimated fair value subsequent to purchase of equity securities still held at the end of the respective periods and recognized in net investment gains (losses) | $ (58) | $ (14) | $ (47) | $ 44
Realized gains (losses) on investments sold or disposed | (39) | (281) | (369) | (847)
Foreign currency gains (losses) | 170 | (21) | 5 | (7)
Net realized investment gains (losses) from sales and disposals of investments | 26 | (234) | (170) | (721)
Net investment income |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Net realized investment gains (losses) from sales and disposals of investments | 65 | 47 | 199 | 126
Cash Flow Hedging |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Realized gains (losses) on investments sold or disposed | 0 | 2 | 0 | (20)
Equity Securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Changes in estimated fair value subsequent to purchase of equity securities still held at the end of the respective periods and recognized in net investment gains (losses) | $ (36) | $ (10) | $ (23) | $ 9

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