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Mortgage Servicing Rights and Related Liabilities - MSRs and Related Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Mortgage Servicing Rights [Line Items]      
Forward MSRs - fair value $ 2,757 $ 3,496 $ 3,505
Mortgage servicing rights 2,763 3,502  
Mortgage servicing liabilities - amortized cost 48 61  
Excess spread financing - fair value 1,124 1,311  
Mortgage servicing rights financing - fair value 49 37  
MSR related liabilities - nonrecourse at fair value 1,173 1,348  
Mortgage servicing rights      
Mortgage Servicing Rights [Line Items]      
Forward MSRs - fair value 2,757 3,496  
Reverse MSRs - amortized cost 6 6  
Mortgage servicing rights 2,763 3,502  
Mortgage servicing liabilities - amortized cost $ 48 $ 61