Financial Derivatives (Hedged Items- Fair Value Hedges) (Details) - Designated as Hedging Instrument - Fair Value Hedging - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Carrying Value of the Hedged Items	$ 2,076	$ 2,376
Cumulative fair value hedge adjustment included in the carrying value of hedged items	(122)	(121)
Borrowed Funds
Derivative Instruments, Gain (Loss) [Line Items]
Carrying Value of the Hedged Items	30,503	21,781
Cumulative fair value hedge adjustment included in the carrying value of hedged items	(737)	(1,283)
Borrowed Funds Discontinued Relationships
Derivative Instruments, Gain (Loss) [Line Items]
Fair value hedge adjustments primarily related to discontinued borrowed funds hedge relationships, cumulative increase (decrease)	$ (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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-Topic 815
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Amount of asset hedged in fair value hedging relationship.

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