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Reverse Mortgage Interests, Net - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 7 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2018 | Mar. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Jul. 31, 2018 | Sep. 30, 2017 | Aug. 01, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
UPB unsecuritized |  |  | $ 1,810 |  |  |  |  |  |  |  |
Net proceeds related to acquisition of HECM related receivables |  |  | 0 |  |  |  |  |  |  |  |
Unsecuritized HECM |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest earned on HECM loans |  |  | 72 |  |  |  |  |  |  |  |
Participating Interests in HMBS |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
UPB securitized | $ 198 |  | 44 | $ 416 | $ 198 | $ 416 |  |  |  |  |
Trust 2017-1 and Trust 2017-2 |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
UPB securitized | 760 |  |  |  | 760 |  |  |  |  |  |
Trust 2016-2 and Trust 2016-3 |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
UPB unsecuritized | 284 |  |  |  | 284 |  |  |  |  |  |
Reverse Mortgage Interests, Unsecuritized |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase discount on acquisitions |  | $ 7 |  |  |  |  |  |  |  |  |
Net proceeds related to acquisition of HECM related receivables |  | 1 |  |  |  |  |  |  |  |  |
Reverse Mortgage Interests, Unsecuritized | HECM |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repurchase of HECM loans |  |  | 608 |  |  |  |  |  |  |  |
Repurchase of HECM loans funded by prior servicer |  |  | 138 |  |  |  |  |  |  |  |
Participating Interests In HECM Loan |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase of servicing rights |  | 467 |  |  |  |  |  |  |  |  |
HMBS Obligations |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase of servicing rights |  | 460 |  |  |  |  |  |  |  |  |
Other Interest Securitized and Unsecuritized Interests |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase discount |  |  |  |  |  |  | $ 278 |  |  |  |
Receivables From Prior Servicers, Reverse Mortgage Interests |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Account receivables |  |  | 25 |  |  |  |  |  |  |  |
HECM Related Receivables |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Account receivables |  | $ 2 |  |  |  |  |  |  |  |  |
Mortgage-backed debt |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt premium |  |  | 55 |  |  |  |  |  |  |  |
Mortgage-backed debt | Participating Interests in HMBS |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt premium | 58 |  | $ 55 |  | 58 |  | $ 58 |  |  |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
UPB unsecuritized |  |  |  |  |  |  |  |  | $ 2,080 |  |
Net proceeds related to acquisition of HECM related receivables |  |  |  |  | 0 | 16 |  |  |  |  |
Debt premium |  |  |  |  |  |  |  |  | 62 |  |
Purchase discount | 82 |  |  | 96 | 82 | 96 |  | $ 84 | 89 | $ 43 | $ 43
Predecessor | Unsecuritized HECM |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest earned on HECM loans | $ 38 |  |  | $ 137 | 274 | 370 |  |  |  |  |
Predecessor | Reverse Mortgage Interests, Unsecuritized | HECM |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repurchase of HECM loans |  |  |  |  | 2,439 | 3,270 |  |  |  |  |
Repurchase of HECM loans funded by prior servicer |  |  |  |  | $ 512 | $ 802 |  |  |  |  |
Predecessor | Receivables From Prior Servicers, Reverse Mortgage Interests |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Account receivables |  |  |  |  |  |  |  |  | 22 |  |
Predecessor | Mortgage-backed debt |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt premium |  |  |  |  |  |  |  |  | $ 0 |  |

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