Financial Derivatives (Gains (Losses) Recognized on Fair Value and Cash Flow Hedges in the Consolidated Income Statement) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]
Loans	$ 4,792	$ 4,472
Investment Securities	1,202	1,124
Borrowed Funds	748	846
Other income	125	137
Other amounts related to interest settlements on derivatives	(3)	5
Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	(143)	329
Interest Income \| Loans
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income	(51)	(189)
Interest Income \| Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income	(6)	(7)
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	200	(558)
Noninterest Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income	0	2
Fair value hedges \| Designated as Hedging Instrument \| Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives	140	(329)
Amounts related to interest settlements on derivatives	(3)	24
Fair value hedges \| Designated as Hedging Instrument \| Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives	(198)	562
Amounts related to interest settlements on derivatives	$ (36)	$ (96)

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