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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
Sep. 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 $ 899
Weighted- Average Life (in years) 4 years 8 months 12 days
Prepayment Speed (annual) 15.40%
Impact of Adverse Change on Fair Value 10% $ (32)
Impact of Adverse Change on Fair Value 20% (62)
Impact of Adverse Change on Fair Value 50% $ (143)
OAS spread (bps) 61900.00%
Impact of Adverse Change on Fair Value 10% $ (18)
Impact of Adverse Change on Fair Value 20% (36)
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 $ 11
Weighted- Average Life (in years) 3 years 4 months 24 days
Prepayment Speed (annual) 23.40%
Impact of Adverse Change on Fair Value 10% $ (1)
Impact of Adverse Change on Fair Value 20% (1)
Impact of Adverse Change on Fair Value 50% $ (3)
OAS spread (bps) 91400.00%
Impact of Adverse Change on Fair Value 10% $ 0
Impact of Adverse Change on Fair Value 20% $ 0