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MSR - Sensitivity of the Current Fair Value of Residual Cash Flows to Adverse Changes in Assumptions (Details)
$ in Millions
3 Months Ended
Jun. 30, 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 [Line Items]  
Fair Value $ 1,026
Weighted- Average Life (in years) 5 years 2 months 12 days
Prepayment Speed (annual) 13.20%
Impact of Adverse Change on Fair Value 10% $ (37)
Impact of Adverse Change on Fair Value 20% (72)
Impact of Adverse Change on Fair Value 50% $ (163)
OAS spread (bps) 56100.00%
Impact of Adverse Change on Fair Value 10% $ (21)
Impact of Adverse Change on Fair Value 20% (40)
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 $ 13
Weighted- Average Life (in years) 3 years 6 months
Prepayment Speed (annual) 23.50%
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% $ (3)
OAS spread (bps) 90900.00%
Impact of Adverse Change on Fair Value 10% $ 0
Impact of Adverse Change on Fair Value 20% $ (1)