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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Loans	$ 4,643	$ 3,138	$ 13,424	$ 7,935
Investment Securities	892	715	2,660	1,890
Borrowed Funds	993	317	2,679	542
Noninterest income	$ 1,815	$ 2,074	$ 5,616	$ 6,027
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	$ 94	$ 317	$ 481	$ 705
Fair value hedges \| Designated as Hedging Instrument \| Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives	158	86	163	135
Fair value hedges \| Designated as Hedging Instrument \| Investment Securities \| Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	(156)	(85)	(157)	(131)
Amounts related to interest settlements on derivatives	8	(1)	20	(4)
Fair value hedges \| Designated as Hedging Instrument \| Borrowed Funds
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives	(421)	(706)	(569)	(2,101)
Fair value hedges \| Designated as Hedging Instrument \| Borrowed Funds \| Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	416	696	551	2,073
Amounts related to interest settlements on derivatives	(167)	1	(427)	185
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	(418)	(122)	(1,108)	(5)
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)	(7)	$ (21)	3
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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