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Goodwill (Changes in the Net Carrying Amount of Goodwill by Reporting Segment) (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Mar. 22, 2019
Dec. 31, 2017
Goodwill        
Goodwill     $ 1,800,000,000 $ 3,410,000,000
Accumulated impairment losses       (965,000,000)
Goodwill Roll Forward        
Net carrying amount, beginning of period: $ 2,478,000,000 $ 2,445,000,000    
Acquisition activity 1,777,000,000 33,000,000    
Sale of Business (3,000,000)      
Net carrying amount, end of period: 4,252,000,000 2,478,000,000    
Commercial Banking        
Goodwill        
Goodwill       1,363,000,000
Accumulated impairment losses       (750,000,000)
Goodwill Roll Forward        
Net carrying amount, beginning of period: 630,000,000 613,000,000    
Acquisition activity 1,324,000,000 17,000,000    
Sale of Business 0      
Net carrying amount, end of period: 1,954,000,000 630,000,000    
Branch Banking        
Goodwill        
Goodwill       1,655,000,000
Accumulated impairment losses       0
Goodwill Roll Forward        
Net carrying amount, beginning of period: 1,655,000,000 1,655,000,000    
Acquisition activity 391,000,000 0    
Sale of Business 0      
Net carrying amount, end of period: 2,046,000,000 1,655,000,000    
Consumer Lending        
Goodwill        
Goodwill       215,000,000
Accumulated impairment losses       (215,000,000)
Goodwill Roll Forward        
Net carrying amount, beginning of period: 0 0    
Acquisition activity 0 0    
Sale of Business 0      
Net carrying amount, end of period: 0 0    
Wealth and Asset Management        
Goodwill        
Goodwill       177,000,000
Accumulated impairment losses       $ 0
Goodwill Roll Forward        
Net carrying amount, beginning of period: 193,000,000 177,000,000    
Acquisition activity 62,000,000 16,000,000    
Sale of Business (3,000,000)      
Net carrying amount, end of period: $ 252,000,000 $ 193,000,000