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, 2025	Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Loans	$ 4,472	$ 4,819
Investment Securities	1,124	883
Borrowed Funds	846	1,159
Other	137	135
Other amounts related to interest settlements on derivatives	5	22
Loans
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income		(369)
Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income		(7)
Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	329	(74)
Interest Income \| Loans
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income	(189)
Interest Income \| Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income	(7)
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	(558)	413
Noninterest Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income	2
Fair value hedges \| Designated as Hedging Instrument \| Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives	(329)	74
Amounts related to interest settlements on derivatives	24	10
Fair value hedges \| Designated as Hedging Instrument \| Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives	562	(428)
Amounts related to interest settlements on derivatives	$ (96)	$ (175)

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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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