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Intangible Assets - Intangible Assets (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]        
Goodwill $ 9,655 $ 9,369 $ 9,434 $ 9,344
Mortgage servicing rights 2,546 2,791 $ 2,645 $ 2,591
Total $ 12,878 12,761    
Merchant Processing Contracts [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization Method SL/AC      
Finite-Lived Intangible Assets $ 225 155    
Core Deposit Benefits [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization Method SL/AC      
Finite-Lived Intangible Assets $ 82 104    
Trust Relationships [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization Method SL/AC      
Finite-Lived Intangible Assets $ 27 34    
Other Identified Intangibles [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization Method SL/AC      
Finite-Lived Intangible Assets $ 343 $ 308    
Straight line method [Member] | Merchant Processing Contracts [Member]        
Finite-Lived Intangible Assets [Line Items]        
Estimated Life 6 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 6 years      
Accelerated method [Member] | Merchant Processing Contracts [Member]        
Finite-Lived Intangible Assets [Line Items]        
Estimated Life 7 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 7 years      
Accelerated method [Member] | Other Identified Intangibles [Member]        
Finite-Lived Intangible Assets [Line Items]        
Estimated Life 4 years