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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) - Jun. 30, 2015 - USD ($)
$ in Millions
Total
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 [1] $ 826
Weighted- Average Life (in years) [1] 7 years 6 months
Prepayment Speed (annual) [1] 7.60%
Impact of Adverse Change on Fair Value 10% [1] $ (27)
Impact of Adverse Change on Fair Value 20% [1] (52)
Impact of Adverse Change on Fair Value 50% [1] $ (119)
OAS spread (bps) [1] 930
Impact of Adverse Change on Fair Value 10% [1] $ (28)
Impact of Adverse Change on Fair Value 20% [1] (54)
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 [1] $ 27
Weighted- Average Life (in years) [1] 2 years 6 months
Prepayment Speed (annual) [1] 32.70%
Impact of Adverse Change on Fair Value 10% [1] $ (2)
Impact of Adverse Change on Fair Value 20% [1] (4)
Impact of Adverse Change on Fair Value 50% [1] $ (7)
OAS spread (bps) [1] 651
Impact of Adverse Change on Fair Value 20% [1] $ (1)
[1] The impact of the weighted-average default rate on the current fair value of residual cash flows for all scenarios is immaterial.