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Premises, Equipment and Leases - Components of Premises and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Total premises and equipment, gross $ 9,188 $ 8,727
Less: Accumulated depreciation and amortization (4,810) (4,536)
Total premises and equipment, net 4,378 4,191
Land    
Property, Plant and Equipment [Line Items]    
Total premises and equipment, gross 382 386
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Total premises and equipment, gross 3,903 3,994
Furniture and equipment    
Property, Plant and Equipment [Line Items]    
Total premises and equipment, gross 2,218 2,018
Computer software    
Property, Plant and Equipment [Line Items]    
Total premises and equipment, gross 1,996 1,847
In progress    
Property, Plant and Equipment [Line Items]    
Total premises and equipment, gross $ 689 $ 482