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MSR (Sensitivity of the Current Fair Value of Residual Cash Flows to Immediate 10%, 20% and 50% Adverse Changes in Assumptions) (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
[1]
Fixed Rate Residential Mortgage Loans  
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption  
Fair Value $ 756
Weighted- Average Life (in years) 6 years
Prepayment Speed (annual) 11.20%
Impact of Adverse Change on Fair Value 10% $ (33)
Impact of Adverse Change on Fair Value 20% (63)
Impact of Adverse Change on Fair Value 50% $ (143)
OAS spread (bps) 5.28%
Impact of Adverse Change on Fair Value 10% $ (15)
Impact of Adverse Change on Fair Value 20% (30)
Adjustable Rate Residential Mortgage Loans  
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption  
Fair Value $ 20
Weighted- Average Life (in years) 3 years 3 months 18 days
Prepayment Speed (annual) 25.20%
Impact of Adverse Change on Fair Value 10% $ (1)
Impact of Adverse Change on Fair Value 20% (3)
Impact of Adverse Change on Fair Value 50% $ (6)
OAS spread (bps) 7.57%
Impact of Adverse Change on Fair Value 10% $ 0
Impact of Adverse Change on Fair Value 20% $ (1)
[1]

(a) The impact of the weighted-average default rate on the current fair value of residual cash flows for all scenarios is immaterial .