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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, 2024 | Dec. 31, 2023
--- | --- | ---
Borrowed Funds |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying Value of the Hedged Items | $ 35,469 | $ 30,503
Cumulative Fair Value Hedge Adjustment included in the Carrying Value of Hedged Items | (83) | (737)
Borrowed Funds Discontinued Relationships |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Cumulative fair value hedge adjustment included in carrying value of hedged items | (100) | (100)
Securities available for sale |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying Value of the Hedged Items | 19,063 | 2,076
Cumulative Fair Value Hedge Adjustment included in the Carrying Value of Hedged Items | $ 513 | $ (122)

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