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Premises and Equipment Summary of Premises and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Land $ 85 $ 86
Buildings and improvements 852 847
Furniture and equipment 516 485
Total cost 1,453 1,418
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (999) (959)
Premises and equipment $ 454 $ 459