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, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Loans, interest income	$ 18,299	$ 11,795	$ 9,007
Investment securities, interest income	3,545	2,726	1,834
Borrowed funds, interest expense	3,783	1,155	361
Total noninterest income	$ 7,574	$ 8,106	$ 8,564
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	$ 619	$ 952	$ 1,199
Fair Value Hedging \| Designated as Hedging Instrument \| Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives recognized in income	2	143	9
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	2	(136)	(5)
Interest settlements on derivatives	28	(2)	(4)
Fair Value Hedging \| Designated as Hedging Instrument \| Borrowed Funds
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives recognized in income	531	(1,976)	(993)
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	(545)	1,945	937
Interest settlements on derivatives	(605)	120	521
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	(1,512)	(259)	376
Other amounts related to interest settlements on derivatives	115	41
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	$ (28)	$ (1)	57
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

Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Other

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Interest Settlements on Derivatives

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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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Indicates line item in statement of income or comprehensive income that includes gain (loss) from derivative.

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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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Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities.

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

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