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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
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Document Period End Date Dec. 31, 2016    
Servicing Asset at Fair Value, Amount $ 1,572 $ 1,307  
Mortgage Servicing Rights, Fair Value [Member]      
Prepayment rate assumption (annual) 9.00% 10.00%  
Decline in fair value from 10% adverse change $ 50 $ 49  
Decline in fair value from 20% adverse change $ 97 $ 94  
Discount rate (annual) 8.00% 8.00%  
Decline in fair value from 10% adverse change $ 63 $ 64  
Decline in fair value from 20% adverse change $ 122 $ 123  
Weighted-average life (in years) 7 years 6 years 7 months  
Weighted-average coupon 4.00% 4.10%  
indirect auto loan servicing rights [Member]      
Servicing Asset at Fair Value, Amount $ 4 $ 9  
Mortgage Servicing Rights, Fair Value [Member]      
Servicing Asset at Fair Value, Amount $ 1,572 $ 1,307 $ 1,206