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Reverse Mortgage Interests, Net - Narrative (Details) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Aug. 01, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
UPB securitized | $ 0 |  |  |  |
Unsecuritized HECM |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Interest earned on HECM loans | 82,000,000 |  |  |  |
Participating Interests in HMBS |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
UPB securitized | 82,000,000 |  |  |  |
GNMA |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
UPB securitized | 61,000,000 |  |  |  |
Trust 2018-3 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
UPB sold | 20,000,000 |  |  |  |
Reverse Mortgage Interests, Unsecuritized | HECM |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Repurchase of HECM loans | 740,000,000 |  |  |  |
Repurchase of HECM loans funded by prior servicer | 188,000,000 |  |  |  |
Other Interest Securitized and Unsecuritized Interests |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Purchase discount |  |  |  | $ 298,000,000 |
Receivables From Prior Servicers, Reverse Mortgage Interests |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Account receivables | 16,000,000 |  | $ 18,000,000 |  |
Mortgage-backed debt |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Debt premium | 36,000,000 |  | 58,000,000 |  |
Mortgage-backed debt | Participating Interests in HMBS |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Debt premium | $ 36,000,000 |  | $ 58,000,000 | $ 42,000,000 |
Predecessor |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Purchase discount |  | $ (90,000,000) |  |  | $ (89,000,000)
Predecessor | Unsecuritized HECM |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Interest earned on HECM loans |  | 119,000,000 |  |  |
Predecessor | Participating Interests in HMBS |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
UPB securitized |  | 85,000,000 |  |  |
Predecessor | Trust 2018-1 and Trust 2018-2 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
UPB securitized |  | 443,000,000 |  |  |
Predecessor | Trust 2016-2 and Trust 2016-3 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
UPB securitized |  | 284,000,000 |  |  |
Predecessor | Reverse Mortgage Interests, Unsecuritized | HECM |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Repurchase of HECM loans |  | 1,051,000,000 |  |  |
Repurchase of HECM loans funded by prior servicer |  | $ 229,000,000 |  |  |

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