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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)
3 Months Ended
Mar. 31, 2019
USD ($)
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 $ 1,128,000,000
Weighted- Average Life (in years) 5 years 10 months 24 days
Prepayment Speed (annual) 11.20%
Impact of Adverse Change on Fair Value 10% $ (42,000,000)
Impact of Adverse Change on Fair Value 20% (81,000,000)
Impact of Adverse Change on Fair Value 50% $ (184,000,000)
OAS spread (bps) 5.38%
Impact of Adverse Change on Fair Value 10% $ (22,000,000)
Impact of Adverse Change on Fair Value 20% (43,000,000)
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 $ 13,000,000
Weighted- Average Life (in years) 3 years 6 months
Prepayment Speed (annual) 23.10%
Impact of Adverse Change on Fair Value 10% $ (1,000,000)
Impact of Adverse Change on Fair Value 20% (2,000,000)
Impact of Adverse Change on Fair Value 50% $ (4,000,000)
OAS spread (bps) 8.84%
Impact of Adverse Change on Fair Value 10% $ 0
Impact of Adverse Change on Fair Value 20% $ (1,000,000)