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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
Jun. 30, 2018
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 $ 944
Weighted- Average Life (in years) 6 years 6 months
Prepayment Speed (annual) 9.50%
Impact of Adverse Change on Fair Value 10% $ (37)
Impact of Adverse Change on Fair Value 20% (71)
Impact of Adverse Change on Fair Value 50% $ (164)
OAS spread (bps) 5.43%
Impact of Adverse Change on Fair Value 10% $ (19)
Impact of Adverse Change on Fair Value 20% (37)
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 $ 15
Weighted- Average Life (in years) 3 years 4 months 24 days
Prepayment Speed (annual) 23.60%
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% $ (4)
OAS spread (bps) 8.17%
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 .