Financial Derivatives (Hedged Items- Fair Value Hedges) (Details) - Designated as Hedging Instrument - Fair Value Hedging - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
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)

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, remaining after discontinued hedge.

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Amount of asset hedged in fair value hedging relationship.

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