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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
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Mortgage Servicing Rights, Fair Value [Member]        
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed 13.00% 9.00%    
Decline in fair value from 10% adverse change $ 91 $ 50    
Decline in fair value from 20% adverse change $ 167 $ 97    
Discount rate (annual) 4.00% 8.00%    
Decline in fair value from 10% adverse change $ 41 $ 63    
Decline in fair value from 20% adverse change $ 80 $ 122    
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Weighted Average Life 5 years 2 months 7 years    
Weighted-average coupon 4.00% 4.00%    
Commercial Mortgage Servicing Rights [Member]        
Servicing Asset at Fair Value, Amount $ 69 $ 62    
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 12.00% 12.00%    
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 7.00% 6.00%    
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions used to Estimate Fair Value, Float Earnings Rate 1.00% 0.50%    
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Weighted Average Life 7 years 1 month 7 years    
Mortgage Servicing Rights, Fair Value [Member]        
Servicing Asset at Fair Value, Amount $ 1,628 $ 1,572 $ 1,119 $ 1,307