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 | |