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Investments (Supplemental Net Investment Gains (Losses)) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
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) | $ 63 | $ (19) | $ 73 | $ 11
Realized gains (losses) on investments sold or disposed | (145) | (195) | (446) | (330)
Foreign currency gains (losses) | 70 | (120) | 145 | (165)
Net realized investment gains (losses) from sales and disposals of investments | (43) | (129) | (301) | (196)
Net investment income |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Net realized investment gains (losses) from sales and disposals of investments | 102 | 66 | 145 | 134
Cash Flow Hedging |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Realized gains (losses) on investments sold or disposed | 10 | 0 | 9 | 0
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) | $ 46 | $ (15) | $ 38 | $ 17

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