Fair Value, Assets and Liabilities, Changes in Value of Assets with Nonrecurring Fair Value Adjustment (Details) - Nonrecurring [Member] - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Loans held for sale	$ (59)	$ 25
Loans	(218)	(177)
Nonmarketable equity securities	295	210
Other assets	(52)	(19)
Total	(30)	39
Total Commercial [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Loans	(12)	(130)
Mortgage servicing rights	4	0
Total Consumer [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Loans	$ (206)	$ (47)

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Increase Decrease In Fair Value Assets Measured On Nonrecurring Basis Loans Held For Sale

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Increase Decrease In Fair Value Assets Measured On Nonrecurring Basis, Nonmarketable Equity Securities

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Increase Decrease In Fair Value Assets Measured On Nonrecurring Basis Other Assets

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Increase Decrease In Fair Value Assets Measured On Nonrecurring Basis Servicing Asset Amount.

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