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Fair Value (Nonrecurring Fair Value Measurements) (Details) - Fair Value, Nonrecurring - Level 3 - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 649		$ 649		$ 853
Gains (Losses)	(83)	$ (180)	(162)	$ (342)
Nonaccrual loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	523		523		629
Gains (Losses)	(66)	(180)	(142)	(333)
Equity investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	74		74		198
Gains (Losses)	0	1	(1)	(1)
OREO, foreclosed and other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	47		47		8
Gains (Losses)	(14)	0	(14)	(1)
Long-lived assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	5		5		18
Gains (Losses)	(1)	(1)	(3)	(7)
Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0		0		$ 0
Gains (Losses)	$ (2)	$ 0	$ (2)	$ 0

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Fair Value, Measurement With Unobservable Inputs Reconciliation, Nonrecurring Basis, Asset Value

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Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included In Earnings

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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