Fair Value, Assets and Liabilities, Gains (Losses) on Assets with Nonrecurring Fair Value Adjustment (Details) - Nonrecurring [Member] - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Loans held for sale	$ (87)	$ 28
Loans	(616)	(663)
Nonmarketable equity securities	(357)	2,974
Other assets	(319)	(84)
Total	(1,375)	2,291
Total Commercial [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Loans	(72)	(254)
Mortgage servicing rights	4	36
Total Consumer [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Loans	$ (544)	$ (409)

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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 Loans

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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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