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Advances and Other Receivables, Net - Narrative (Details) - USD ($) $ in Millions | 5 Months Ended | 7 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Aug. 01, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Provision for inactive and liquidated loans that are no longer part of the MSR portfolio | $ 25 | $ 38 | $ 72 | $ 81 |
Receivable discount | 48 | $ 56 |  |  |
Receivables From Prior Servicers, Forward Loan Portfolio |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Accounts receivable | $ 94 |  | $ 134 |  |
WMIH Corp And Wand Merger Corporation |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Receivable discount |  |  |  |  | $ 302

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