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	Mar. 31, 2025	Dec. 31, 2024
Borrowed Funds
Derivative Instruments, Gain (Loss) [Line Items]
Carrying Value of the Hedged Items	$ 37,004	$ 35,139
Cumulative Fair Value Hedge Adjustment included in the Carrying Value of Hedged Items	(499)	(1,057)
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	20,289	18,716
Cumulative Fair Value Hedge Adjustment included in the Carrying Value of Hedged Items	$ 24	$ (305)

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
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-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Amount of asset hedged in fair value hedging relationship.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
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