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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
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Document Period End Date Mar. 31, 2016      
Servicing Asset at Fair Value, Amount $ 1,182   $ 1,307  
Mortgage Servicing Rights, Fair Value [Member]        
Prepayment rate assumption (annual) 13.00% 10.00%    
Decline in fair value from 10% adverse change $ 54   49  
Decline in fair value from 20% adverse change $ 104   94  
Discount rate (annual) 8.00% 8.00%    
Decline in fair value from 10% adverse change $ 48   64  
Decline in fair value from 20% adverse change $ 92   123  
Weighted-average life (in years) 5 years 7 months 6 years 7 months    
Weighted-average coupon 4.10% 4.10%    
Mortgage Servicing Rights, Fair Value [Member]        
Servicing Asset at Fair Value, Amount $ 1,182 $ 1,181 $ 1,307 $ 1,206