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, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Loans, interest income	$ 19,346	$ 18,299	$ 11,795
Investment securities, interest income	4,123	3,545	2,726
Borrowed funds, interest expense	4,484	3,783	1,155
Total other income	711	619	952
Other amounts related to interest settlements on derivatives	52	115	41
Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on related hedged items recognized in income	(182)	2	(136)
Interest Income \| Loans
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income	(1,257)	(1,512)	(259)
Interest Income \| Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income	(32)	(28)	(1)
Borrowed Funds Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on related hedged items recognized in income	320	(545)	1,945
Noninterest Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income	(28)
Fair Value Hedging \| Designated as Hedging Instrument \| Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives recognized in income	183	2	143
Interest settlements on derivatives	128	28	(2)
Fair Value Hedging \| Designated as Hedging Instrument \| Borrowed Funds Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives recognized in income	(357)	531	(1,976)
Interest settlements on derivatives	$ (694)	$ (605)	$ 120

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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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