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Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations $ 35 $ 31 $ 85 $ 71
Net revenues, discontinued operations 2 $ 81 9 $ 155
Gain related to litigation settlement     15  
Loan servicing income        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 44   88  
Net revenues, discontinued operations 0   0  
Changes in fair value of MSRs and secured liability        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations (4)   (5)  
Net revenues, discontinued operations 0   0  
Origination and other loan fees        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 1   2  
Net revenues, discontinued operations 0   3  
Gain on loans held for sale, net        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 5   10  
Net revenues, discontinued operations 1   2  
Net interest expense        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations (11)   (25)  
Net revenues, discontinued operations 0   0  
Other income        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 0   15  
Net revenues, discontinued operations 1   4  
Mortgage Production segment        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 6   12  
Mortgage Production segment | Loan servicing income        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 0   0  
Mortgage Production segment | Changes in fair value of MSRs and secured liability        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 0   0  
Mortgage Production segment | Origination and other loan fees        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 1   2  
Mortgage Production segment | Gain on loans held for sale, net        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 5   10  
Mortgage Production segment | Net interest expense        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 0   0  
Mortgage Production segment | Other income        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 0   0  
Subservicing | Mortgage Servicing segment        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 26   50  
Subservicing | Mortgage Servicing segment | Loan servicing income        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 26   50  
Subservicing | Mortgage Servicing segment | Changes in fair value of MSRs and secured liability        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 0   0  
Subservicing | Mortgage Servicing segment | Origination and other loan fees        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 0   0  
Subservicing | Mortgage Servicing segment | Gain on loans held for sale, net        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 0   0  
Subservicing | Mortgage Servicing segment | Net interest expense        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 0   0  
Subservicing | Mortgage Servicing segment | Other income        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 0   0  
Subservicing | Accounting Standards Update 2014-09        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customers 2   2  
Owned Servicing | Mortgage Servicing segment        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 3   23  
Owned Servicing | Mortgage Servicing segment | Loan servicing income        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 18   38  
Owned Servicing | Mortgage Servicing segment | Changes in fair value of MSRs and secured liability        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations (4)   (5)  
Owned Servicing | Mortgage Servicing segment | Origination and other loan fees        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 0   0  
Owned Servicing | Mortgage Servicing segment | Gain on loans held for sale, net        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 0   0  
Owned Servicing | Mortgage Servicing segment | Net interest expense        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations (11)   (25)  
Owned Servicing | Mortgage Servicing segment | Other income        
Disaggregation of Revenue [Line Items]        
Net revenues, continuing operations 0   15  
Discontinued Operations | Accounting Standards Update 2014-09        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customers 1   5  
Discontinued Operations | Accounting Standards Update 2014-09 | Origination and other loan fees        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customers     2  
Discontinued Operations | Accounting Standards Update 2014-09 | Other income        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customers $ 1   $ 3