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Bank Premises and Equipment (Bank Premises and Equipment) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment    
Land and improvements [1] $ 639 $ 586
Buildings [1] 1,575 1,547
Equipment 2,126 1,987
Leasehold improvements 432 403
Construction in progress [1] 85 81
Land and improvements held for sale 8 25
Buildings held for sale 18 14
Equipment held for sale 1 3
Accumulated depreciation and amortization (2,889) (2,785)
Total bank premises and equipment $ 1,995 $ 1,861
Building | Upper Limit    
Property, Plant and Equipment    
Useful life 30 years  
Building | Lower limit    
Property, Plant and Equipment    
Useful life 1 year  
Equipment | Upper Limit    
Property, Plant and Equipment    
Useful life 20 years  
Equipment | Lower limit    
Property, Plant and Equipment    
Useful life 2 years  
Leasehold Improvements | Upper Limit    
Property, Plant and Equipment    
Useful life 30 years  
Leasehold Improvements | Lower limit    
Property, Plant and Equipment    
Useful life 1 year  
[1] At December 31, 2019 and 2018, land and improvements, buildings and construction in progress included $51 and $55, respectively, associated with parcels of undeveloped land intended for future branch expansion.