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Debt and Borrowing Arrangements - Assets pledged as collateral or funded by subservicing clients (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Debt and Borrowing Arrangements    
Restricted cash $ 41 $ 57
Servicing advances, net 356 628
Mortgage loans held for sale (unpaid principal balance) 270 683
Mortgage servicing rights 476 $ 690
Warehouse Facilities | Collateral Pledged    
Debt and Borrowing Arrangements    
Restricted cash 3  
Servicing advances, net 0  
Mortgage loans held for sale (unpaid principal balance) 233  
Mortgage servicing rights 0  
Total 236  
Servicing Advance Facility | Collateral Pledged    
Debt and Borrowing Arrangements    
Restricted cash 10  
Servicing advances, net 56  
Mortgage loans held for sale (unpaid principal balance) 0  
Mortgage servicing rights 0  
Total 66  
Subservicing Advance Liabilities | Collateral Pledged    
Debt and Borrowing Arrangements    
Restricted cash 0  
Servicing advances, net 232  
Mortgage loans held for sale (unpaid principal balance) 0  
Mortgage servicing rights 0  
Total 232  
MSRs Secured Liability | Collateral Pledged    
Debt and Borrowing Arrangements    
Restricted cash 0  
Servicing advances, net 0  
Mortgage loans held for sale (unpaid principal balance) 0  
Mortgage servicing rights 419  
Total $ 419