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Mortgage Servicing Rights - Sensitivity to Changes in Interest Rates of the Fair Value of MSRs Portfolio and Related Derivative Instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Down Scenario [Member] | Mortgage Servicing Rights [Member]    
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]    
Net fair value 100 basis points $ (476) $ (598)
Net fair value 50 basis points (209) (250)
Net fair value 25 basis points (98) (114)
Down Scenario [Member] | Derivative [Member]    
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]    
Net fair value 100 basis points 375 475
Net fair value 50 basis points 180 226
Net fair value 25 basis points 88 107
Down Scenario [Member] | Net Sensitivity [Member]    
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]    
Net fair value 100 basis points (101) (123)
Net fair value 50 basis points (29) (24)
Net fair value 25 basis points (10) (7)
Up Scenario [Member] | Mortgage Servicing Rights [Member]    
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]    
Net fair value 100 basis points 270 344
Net fair value 50 basis points 159 176
Net fair value 25 basis points 85 96
Up Scenario [Member] | Derivative [Member]    
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]    
Net fair value 100 basis points (314) (377)
Net fair value 50 basis points (165) (192)
Net fair value 25 basis points (84) (98)
Up Scenario [Member] | Net Sensitivity [Member]    
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]    
Net fair value 100 basis points (44) (33)
Net fair value 50 basis points (6) (16)
Net fair value 25 basis points $ 1 $ (2)