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Sensitivity of the Current Fair Value of Residual Cash Flows to Immediate 10%, 20% and 50% Adverse Changes in Assumptions (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2015
USD ($)
[1]
Fixed Rate Residential Mortgage  
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]  
Fair Value $ 731
Weighted- Average Life (in years) 5 years 8 months 12 days
Prepayment Speed (annual) 11.70%
Impact of Adverse Change on Fair Value 10% $ (34)
Impact of Adverse Change on Fair Value 20% (66)
Impact of Adverse Change on Fair Value 50% $ (146)
OAS spread (bps) 706
Impact of Adverse Change on Fair Value 10% $ (19)
Impact of Adverse Change on Fair Value 20% (37)
Adjustable Rate Residential Mortgage  
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]  
Fair Value $ 25
Weighted- Average Life (in years) 2 years 6 months
Prepayment Speed (annual) 32.70%
Impact of Adverse Change on Fair Value 10% $ (2)
Impact of Adverse Change on Fair Value 20% (3)
Impact of Adverse Change on Fair Value 50% $ (7)
OAS spread (bps) 668
Impact of Adverse Change on Fair Value 20% $ (1)
[1] The impact of the weighted-average default rate on the current fair value of residual cash flows for all scenarios is immaterial.