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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Loans	$ 4,842	$ 4,523	$ 9,661	$ 8,781
Investment Securities	1,001	883	1,884	1,768
Borrowed Funds	1,182	903	2,341	1,686
Total other income	332	129	467	387
Other amounts related to interest settlements on derivatives	20	27	42	55
Loans
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income		(365)		(690)
Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income		(8)		(13)
Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	182	(48)	108	(1)
Interest Income \| Loans
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income	(347)		(716)
Interest Income \| Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income	(8)		(15)
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	22	432	435	135
Noninterest Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income	(28)		(28)
Fair value hedges \| Designated as Hedging Instrument \| Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives	(185)	50	(111)	5
Amounts related to interest settlements on derivatives	29	7	39	12
Fair value hedges \| Designated as Hedging Instrument \| Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives	(19)	(439)	(447)	(148)
Amounts related to interest settlements on derivatives	$ (190)	$ (147)	$ (365)	$ (260)

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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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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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