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Derivative Financial Instruments - Net Gains (Losses) Recorded in the Condensed Consolidated Statements of Income Relating to Free-Standing Derivative Instruments Used for Risk Management and Other Business Purposes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Interest rate contracts | Income Statement Location [Axis]: us-gaap:FeesAndCommissionsMortgageBankingAndServicing | MSR portfolio
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	$ (17)	$ 13	$ (28)	$ 32
Forward contracts related to residential mortgage loans measured at fair value | Income Statement Location [Axis]: us-gaap:FeesAndCommissionsMortgageBankingAndServicing
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	0	(3)	9	(12)
Foreign exchange contracts | Income Statement Location [Axis]: us-gaap:NoninterestIncomeOtherOperatingIncome
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	12	(6)	22	(5)
Equity contracts | Income Statement Location [Axis]: us-gaap:NoninterestIncomeOtherOperatingIncome | Swap
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	$ (1)	$ (1)	$ 7	$ (19)

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