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Debt and Borrowing Arrangements - Assets pledged as collateral or funded by subservicing clients (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Debt and Borrowing Arrangements      
Restricted cash $ 41 $ 33 $ 60
Servicing advances 302 356  
Mortgage loans held for sale (unpaid principal balance) 55 103  
Mortgage servicing rights 483 $ 476  
Collateral Pledged | Warehouse Facilities      
Debt and Borrowing Arrangements      
Restricted cash 0    
Servicing advances 0    
Mortgage loans held for sale (unpaid principal balance) 40    
Mortgage servicing rights 0    
Total 40    
Collateral Pledged | Servicing Advance Facility      
Debt and Borrowing Arrangements      
Restricted cash 10    
Servicing advances 46    
Mortgage loans held for sale (unpaid principal balance) 0    
Mortgage servicing rights 0    
Total 56    
Collateral Pledged | Subservicing Advance Liabilities      
Debt and Borrowing Arrangements      
Restricted cash 0    
Servicing advances 194    
Mortgage loans held for sale (unpaid principal balance) 0    
Mortgage servicing rights 0    
Total 194    
Collateral Pledged | MSRs Secured Liability      
Debt and Borrowing Arrangements      
Restricted cash 0    
Servicing advances 0    
Mortgage loans held for sale (unpaid principal balance) 0    
Mortgage servicing rights 437    
Total $ 437