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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
12 Months Ended
Dec. 31, 2017
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  
Fair Value $ 841
Weighted- Average Life (in years) 6 years
Prepayment Speed (annual) 11.40%
Impact of Adverse Change on Fair Value 10% $ 36
Impact of Adverse Change on Fair Value 20% 69
Impact of Adverse Change on Fair Value 50% $ 158
OAS spread (bps) 54.90%
Impact of Adverse Change on Fair Value 10% $ 17
Impact of Adverse Change on Fair Value 20% 33
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  
Fair Value $ 17
Weighted- Average Life (in years) 3 years 3 months 18 days
Prepayment Speed (annual) 24.60%
Impact of Adverse Change on Fair Value 10% $ 1
Impact of Adverse Change on Fair Value 20% 2
Impact of Adverse Change on Fair Value 50% $ 5
OAS spread (bps) 78.50%
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 .