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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, 2018
Dec. 31, 2017
Commercial Mortgage Servicing Rights [Member]    
Servicing Asset at Fair Value, Amount $ 76 $ 75
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 12.00% 12.00%
Decline in fair value from 10% adverse change $ 3 $ 3
Decline in fair value from 20% adverse change $ 6 $ 6
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 6.00% 7.00%
Decline in fair value from 10% adverse change $ 1 $ 1
Decline in fair value from 20% adverse change $ 2 $ 2
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Weighted Average Life 7 years 2 months 7 years
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions used to Estimate Fair Value, Float Earnings Rate 1.10% 1.10%
Mortgage Servicing Rights, Fair Value [Member]    
Servicing Asset at Fair Value, Amount $ 1,916 $ 1,710
Discount rate (annual) 4.00% 4.00%
Decline in fair value from 10% adverse change $ 53 $ 47
Decline in fair value from 20% adverse change $ 101 $ 90
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed 13.00% 13.00%
Decline in fair value from 10% adverse change $ 89 $ 85
Decline in fair value from 20% adverse change $ 169 $ 160
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Weighted Average Life 5 years 7 months 5 years 5 months
Weighted-average coupon 4.00% 3.90%