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Securitizations and Financings - Assets and Liabilities of Consolidated VIEs (Details) $ in Millions | Dec. 31, 2018 USD ($) special_purpose_entity | Dec. 31, 2017 USD ($)
--- | --- | ---
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Consolidated reverse mortgage SPE's | special_purpose_entity | 4 |
Transfers Accounted for as Secured Borrowings, Assets | $ 816 |
Reverse Secured Borrowings, Assets | 6,833 |
Transfers Accounted for as Secured Borrowings, Liabilities | 535 |
Reverse Secured Borrowings, Liabilities | 6,699 |
Residential Mortgage | Restricted cash |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Assets | 70 |
Reverse Secured Borrowings, Assets | 63 |
Residential Mortgage | Reverse mortgage interests, net |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Assets | 0 |
Reverse Secured Borrowings, Assets | 6,770 |
Residential Mortgage | Advances and other receivables, net |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Assets | 628 |
Reverse Secured Borrowings, Assets | 0 |
Residential Mortgage | Mortgage loans held for investment |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Assets | 118 |
Reverse Secured Borrowings, Assets | 0 |
Residential Mortgage | Other assets |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Assets | 0 |
Reverse Secured Borrowings, Assets | 0 |
Residential Mortgage | Advance facilities |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities | 505 |
Reverse Secured Borrowings, Liabilities | 0 |
Residential Mortgage | Payables and accrued liabilities |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities | 1 |
Reverse Secured Borrowings, Liabilities | 1 |
Residential Mortgage | Participating interest financing |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities | 0 |
Reverse Secured Borrowings, Liabilities | 5,607 |
Residential Mortgage | Trust 2016-2 | HECM Securitizations (HMBS) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities | 0 |
Reverse Secured Borrowings, Liabilities | 0 |
Residential Mortgage | Trust 2016-3 | HECM Securitizations (HMBS) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities | 0 |
Reverse Secured Borrowings, Liabilities | 0 |
Residential Mortgage | Trust 2017-1 | HECM Securitizations (HMBS) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities | 0 |
Reverse Secured Borrowings, Liabilities | 0 |
Residential Mortgage | Trust 2017-2 | HECM Securitizations (HMBS) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities | 0 |
Reverse Secured Borrowings, Liabilities | 231 |
Residential Mortgage | Trust 2018-1 | HECM Securitizations (HMBS) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities | 0 |
Reverse Secured Borrowings, Liabilities | 284 |
Residential Mortgage | Trust 2018-2 | HECM Securitizations (HMBS) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities | 0 |
Reverse Secured Borrowings, Liabilities | 250 |
Residential Mortgage | Trust 2018-3 | HECM Securitizations (HMBS) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities | 0 |
Reverse Secured Borrowings, Liabilities | 326 |
Residential Mortgage | Other nonrecourse debt |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities | 29 |
Reverse Secured Borrowings, Liabilities | $ 0 |
Predecessor |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Assets |  | $ 1,142
Reverse Secured Borrowings, Assets |  | 8,007
Transfers Accounted for as Secured Borrowings, Liabilities |  | 793
Reverse Secured Borrowings, Liabilities |  | 7,922
Predecessor | Residential Mortgage | Restricted cash |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Assets |  | 106
Reverse Secured Borrowings, Assets |  | 26
Predecessor | Residential Mortgage | Reverse mortgage interests, net |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Assets |  | 0
Reverse Secured Borrowings, Assets |  | 7,981
Predecessor | Residential Mortgage | Advances and other receivables, net |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Assets |  | 896
Reverse Secured Borrowings, Assets |  | 0
Predecessor | Residential Mortgage | Mortgage loans held for investment |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Assets |  | 138
Reverse Secured Borrowings, Assets |  | 0
Predecessor | Residential Mortgage | Other assets |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Assets |  | 2
Reverse Secured Borrowings, Assets |  | 0
Predecessor | Residential Mortgage | Advance facilities |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities |  | 749
Reverse Secured Borrowings, Liabilities |  | 0
Predecessor | Residential Mortgage | Payables and accrued liabilities |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities |  | 2
Reverse Secured Borrowings, Liabilities |  | 1
Predecessor | Residential Mortgage | Participating interest financing |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities |  | 0
Reverse Secured Borrowings, Liabilities |  | 7,111
Predecessor | Residential Mortgage | Trust 2016-2 | HECM Securitizations (HMBS) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities |  | 0
Reverse Secured Borrowings, Liabilities |  | 94
Predecessor | Residential Mortgage | Trust 2016-3 | HECM Securitizations (HMBS) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities |  | 0
Reverse Secured Borrowings, Liabilities |  | 138
Predecessor | Residential Mortgage | Trust 2017-1 | HECM Securitizations (HMBS) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities |  | 0
Reverse Secured Borrowings, Liabilities |  | 213
Predecessor | Residential Mortgage | Trust 2017-2 | HECM Securitizations (HMBS) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities |  | 0
Reverse Secured Borrowings, Liabilities |  | 365
Predecessor | Residential Mortgage | Trust 2018-1 | HECM Securitizations (HMBS) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities |  | 0
Reverse Secured Borrowings, Liabilities |  | 0
Predecessor | Residential Mortgage | Trust 2018-2 | HECM Securitizations (HMBS) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities |  | 0
Reverse Secured Borrowings, Liabilities |  | 0
Predecessor | Residential Mortgage | Trust 2018-3 | HECM Securitizations (HMBS) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities |  | 0
Reverse Secured Borrowings, Liabilities |  | 0
Predecessor | Residential Mortgage | Other nonrecourse debt |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Liabilities |  | 42
Reverse Secured Borrowings, Liabilities |  | $ 0

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