Financial Derivatives (Gains (Losses) Recognized on Fair Value and Cash Flow Hedges in the Consolidated Income Statement) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Loans	$ 4,523	$ 2,504	$ 8,781	$ 4,797
Investment Securities	883	631	1,768	1,175
Borrowed Funds	903	142	1,686	225
Noninterest income	$ 1,783	$ 2,065	$ 3,801	$ 3,953
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Investment Securities, Interest Expense	Investment Securities, Interest Expense	Investment Securities, Interest Expense	Investment Securities, Interest Expense
Other
Derivative Instruments, Gain (Loss) [Line Items]
Noninterest income	$ 129	$ 177	$ 387	$ 388
Fair value hedges \| Designated as Hedging Instrument \| Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives	50	30	5	49
Fair value hedges \| Designated as Hedging Instrument \| Investment Securities \| Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	(48)	(28)	(1)	(46)
Amounts related to interest settlements on derivatives	7	(2)	12	(3)
Fair value hedges \| Designated as Hedging Instrument \| Borrowed Funds
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives	(439)	(451)	(148)	(1,395)
Fair value hedges \| Designated as Hedging Instrument \| Borrowed Funds \| Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	432	443	135	1,377
Amounts related to interest settlements on derivatives	(147)	74	(260)	184
Cash flow hedges \| Designated as Hedging Instrument \| Loans \| Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income	(365)	25	(690)	117
Cash flow hedges \| Designated as Hedging Instrument \| Investment Securities \| Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income	$ (8)		$ (13)	10
Cash flow hedges \| Designated as Hedging Instrument \| Other \| Noninterest Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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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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