Financial Derivatives (Gains (Losses) Recognized on Fair Value and Cash Flow Hedges in the Consolidated Income Statement) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Loans	$ 3,138	$ 2,437	$ 7,935	$ 6,593
Investment Securities	715	460	1,890	1,350
Borrowed Funds	317	90	542	275
Noninterest income	2,074	2,341	6,027	6,299
Other
Derivative Instruments, Gain (Loss) [Line Items]
Noninterest income	317	268	705	907
Fair value hedges \| Designated as Hedging Instrument \| Investment Securities \| Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	(85)	2	(131)	(3)
Derivatives	86		135	7
Amounts related to interest settlements on derivatives	(1)	(1)	(4)	(3)
Fair value hedges \| Designated as Hedging Instrument \| Borrowed Funds \| Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	696	155	2,073	695
Derivatives	(706)	(169)	(2,101)	(740)
Amounts related to interest settlements on derivatives	1	129	185	394
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	(122)	91	(5)	282
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	$ (7)	11	$ 3	49
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		$ 13		$ 27

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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

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