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Financial Derivatives (Hedged Items- Fair Value Hedges) (Details) - Designated as Hedging Instrument - Fair Value Hedging - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Borrowed Funds |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying Value of the Hedged Items | $ 35,139 | $ 30,503
Cumulative fair value hedge adjustment included in the carrying value of hedged items | (1,057) | (737)
Borrowed Funds Discontinued Relationships |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value hedge adjustments related to discontinued available-for-sale securities and borrowed funds hedge relationships, less than | (100) | (100)
Investment Securities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying Value of the Hedged Items | 18,716 | 2,076
Cumulative fair value hedge adjustment included in the carrying value of hedged items | $ (305) | $ (122)

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