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, 2024	Dec. 31, 2023
Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Carrying Value of the Hedged Items	$ 2,284	$ 2,076
Cumulative Fair Value Hedge Adjustment included in the Carrying Value of Hedged Items	(195)	(122)
Borrowed Funds
Derivative Instruments, Gain (Loss) [Line Items]
Carrying Value of the Hedged Items	31,489	30,503
Cumulative Fair Value Hedge Adjustment included in the Carrying Value of Hedged Items	(1,158)	(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)

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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