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Intangible Assets - Intangible Assets (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]        
Goodwill $ 9,344 $ 9,361 $ 9,389 $ 9,205
Mortgage servicing rights 2,591 2,512 $ 2,338 $ 2,680
Total $ 12,647 12,711    
Merchant Processing Contracts [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization Method SL/AC      
Finite-Lived Intangible Assets $ 108 135    
Core Deposit Benefits [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization Method SL/AC      
Finite-Lived Intangible Assets $ 161 194    
Trust Relationships [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization Method SL/AC      
Finite-Lived Intangible Assets $ 59 75    
Other Identified Intangibles [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization Method SL/AC      
Finite-Lived Intangible Assets $ 384 $ 434    
Straight line method [Member] | Merchant Processing Contracts [Member]        
Finite-Lived Intangible Assets [Line Items]        
Estimated Life 7 years      
Straight line method [Member] | Core Deposit Benefits [Member]        
Finite-Lived Intangible Assets [Line Items]        
Estimated Life 22 years      
Straight line method [Member] | Trust Relationships [Member]        
Finite-Lived Intangible Assets [Line Items]        
Estimated Life 10 years      
Straight line method [Member] | Other Identified Intangibles [Member]        
Finite-Lived Intangible Assets [Line Items]        
Estimated Life 8 years      
Accelerated method [Member] | Merchant Processing Contracts [Member]        
Finite-Lived Intangible Assets [Line Items]        
Estimated Life 8 years      
Accelerated method [Member] | Core Deposit Benefits [Member]        
Finite-Lived Intangible Assets [Line Items]        
Estimated Life 5 years      
Accelerated method [Member] | Trust Relationships [Member]        
Finite-Lived Intangible Assets [Line Items]        
Estimated Life 6 years      
Accelerated method [Member] | Other Identified Intangibles [Member]        
Finite-Lived Intangible Assets [Line Items]        
Estimated Life 4 years