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Investments (Supplemental Net Investment Gains (Losses)) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Net Investment Income [Line Items] |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ (65) | $ 60 | $ (86)
Realized gains (losses) on investments sold or disposed | (436) | (1,028) | (880)
Investments Impairment | 101 | 1,498 | 40
Gains (losses) on leveraged leases and renewable energy partnerships | 12 | 24 | 33
Foreign Currency Transaction Gain (Loss), Realized | (79) | 52 | 183
Debt and Equity Securities, Realized Gain (Loss) | (166) | (821) | (725)
Cash Flow Hedging [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Realized gains (losses) on investments sold or disposed | (3) | (7) | 38
Equity Securities |  |  |
Net Investment Income [Line Items] |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ (39) | $ 22 | $ (89)

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