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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Loans	$ 4,609	$ 4,842	$ 9,081	$ 9,661
Investment Securities	1,151	1,001	2,275	1,884
Borrowed Funds	870	1,182	1,716	2,341
Total other income	212	332	349	467
Other amounts related to interest settlements on derivatives	(3)	20	2	42
Loans
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income		(347)		(716)
Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income		(8)		(15)
Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	182	182	511	108
Interest Income \| Loans
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income	(177)		(366)
Interest Income \| Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income	(9)		(16)
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	(318)	22	(876)	435
Noninterest Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income	0	(28)	2	(28)
Fair value hedges \| Designated as Hedging Instrument \| Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives	(180)	(185)	(509)	(111)
Amounts related to interest settlements on derivatives	25	29	49	39
Fair value hedges \| Designated as Hedging Instrument \| Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives	319	(19)	881	(447)
Amounts related to interest settlements on derivatives	$ (99)	$ (190)	$ (195)	$ (365)

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