Financial Derivatives (Gains (Losses) Recognized on Fair Value and Cash Flow Hedges in Consolidated Income Statement) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Loans, interest income	$ 11,795	$ 9,007	$ 8,927
Investment securities, interest income	2,726	1,834	2,041
Borrowed funds, interest expense	1,155	361	718
Total noninterest income	$ 8,106	$ 8,564	$ 6,955
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Investment securities, interest income, Interest Expense	Investment securities, interest income, Interest Expense	Investment securities, interest income, Interest Expense
Other
Derivative Instruments, Gain (Loss) [Line Items]
Total noninterest income	$ 952	$ 1,199	$ 608
Fair Value Hedging \| Designated as Hedging Instrument \| Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives recognized in income	143	9	(202)
Fair Value Hedging \| Designated as Hedging Instrument \| Investment Securities \| Investment Securities Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on related hedged items recognized in income	(136)	(5)	208
Interest settlements on derivatives	(2)	(4)	(9)
Fair Value Hedging \| Designated as Hedging Instrument \| Borrowed Funds
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives recognized in income	(1,976)	(993)	959
Fair Value Hedging \| Designated as Hedging Instrument \| Borrowed Funds \| Borrowed Funds Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on related hedged items recognized in income	1,945	937	(1,059)
Interest settlements on derivatives	120	521	480
Cash Flow Hedging \| Designated as Hedging Instrument \| Loans \| Investment Securities Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income	(259)	376	375
Cash Flow Hedging \| Designated as Hedging Instrument \| Investment Securities \| Investment Securities Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income	$ (1)	57	40
Cash Flow Hedging \| Designated as Hedging Instrument \| Other Income \| Noninterest Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income		$ 61	$ 6

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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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