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Financial Derivatives (Impact of Fair Value Hedge Accounting on the Carrying Value of Hedged Items) (Details) - Fair value hedges - Designated as Hedging Instruments under GAAP - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Borrowed Funds |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying Value of the Hedged Items | $ 40,469 | $ 35,139
Cumulative Fair Value Hedge Adjustment included in the Carrying Value of Hedged Items | (42) | (1,057)
Securities available-for-sale |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying Value of the Hedged Items | 22,876 | 18,716
Cumulative Fair Value Hedge Adjustment included in the Carrying Value of Hedged Items | $ 233 | $ (305)

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