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Goodwill and Other Intangible Assets - Summary of the Key Characteristics, Inputs, and Economic Assumptions Used to Estimate the Fair Value of the Company's MSRs (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Document Period End Date Mar. 31, 2017      
Servicing Asset at Fair Value, Amount $ 1,645 $ 1,572    
Mortgage Servicing Rights, Fair Value [Member]        
Prepayment rate assumption (annual) 13.00% 9.00%    
Decline in fair value from 10% adverse change $ 57 $ 50    
Decline in fair value from 20% adverse change $ 109 $ 97    
Discount rate (annual) 8.00% 8.00%    
Decline in fair value from 10% adverse change $ 76 $ 63    
Decline in fair value from 20% adverse change $ 144 $ 122    
Weighted-average life (in years) 5 years 3 months 7 years    
Weighted-average coupon 4.00% 4.00%    
Commercial Mortgage Servicing Rights [Member]        
Servicing Asset at Fair Value, Amount $ 65 $ 62    
Finite-Lived Intangible Asset, Useful Life 7 years 7 years    
indirect auto loan servicing rights [Member]        
Servicing Asset at Fair Value, Amount $ 3 $ 4    
Mortgage Servicing Rights, Fair Value [Member]        
Servicing Asset at Fair Value, Amount $ 1,645 $ 1,572 $ 1,182 $ 1,307