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Goodwill and Intangible Assets - Components (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Intangible Assets by Major Class [Line Items]        
Goodwill, gross $ 14,653 $ 14,544    
Goodwill 14,653 14,544 $ 14,533 $ 14,519
Intangible assets, gross (excluding Goodwill) 2,178 3,522    
Accumulated amortization (2,004) (3,268)    
Intangible assets, net (excluding Goodwill) 174 254    
Intangible assets gross including Goodwill 16,831 18,066    
Total goodwill and other intangible assets, net carrying value 14,827 14,798    
Commercial MSRs, gross 555 459    
Commercial MSR, accumulated amortization (255) (185)    
Total commercial MSRs $ 300 $ 274    
Intangible assets, remaining amortization period 5 years 7 months 6 days 5 years    
Commercial MSRs, amortization expense $ 70 $ 59    
PCCR intangibles        
Schedule of Intangible Assets by Major Class [Line Items]        
Intangible assets, gross (excluding Goodwill) 1,932 2,102    
Accumulated amortization (1,864) (1,952)    
Intangible assets, net (excluding Goodwill) $ 68 $ 150    
Intangible assets, remaining amortization period 3 years 10 months 24 days 3 years 8 months 12 days    
Core deposit intangibles        
Schedule of Intangible Assets by Major Class [Line Items]        
Intangible assets, gross (excluding Goodwill)   $ 1,149    
Accumulated amortization   (1,148)    
Intangible assets, net (excluding Goodwill)   $ 1    
Intangible assets, remaining amortization period   2 months 12 days    
Other intangible assets        
Schedule of Intangible Assets by Major Class [Line Items]        
Intangible assets, gross (excluding Goodwill) $ 246 $ 271    
Accumulated amortization (140) (168)    
Intangible assets, net (excluding Goodwill) $ 106 $ 103    
Intangible assets, remaining amortization period 6 years 8 months 12 days 7 years 1 month 6 days