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Securitizations and Financings - Assets and Liabilities of Consolidated VIEs (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) special_purpose_entity | Dec. 31, 2018 USD ($) | Jul. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |  |
Number Of VIEs | special_purpose_entity | 4 |  |  |
Transfers accounted for as secured borrowings, assets | $ 606 | $ 816 |  |
Reverse secured borrowings, assets | 5,272 | 6,791 |  |
Transfers accounted for as secured borrowings, liabilities | 360 | 535 |  |
Reverse secured borrowings, liabilities | 5,277 | 6,699 |  |
UPB, purchase discount | 46 | 42 | $ 82 | $ 89
Residential Mortgage | Restricted cash |  |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |  |
Transfers accounted for as secured borrowings, assets | 66 | 70 |  |
Reverse secured borrowings, assets | 42 | 63 |  |
Residential Mortgage | Reverse mortgage interests |  |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |  |
Transfers accounted for as secured borrowings, assets | 0 | 0 |  |
Reverse secured borrowings, assets | 5,230 | 6,728 |  |
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 | 540 | 628 |  |
Reverse secured borrowings, assets | 0 | 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 | 0 | 118 |  |
Reverse secured borrowings, assets | 0 | 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 | 0 |  |
Reverse secured borrowings, assets | 0 | 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 | 359 | 505 |  |
Reverse secured borrowings, liabilities | 0 | 0 |  |
Residential Mortgage | Payables and other liabilities |  |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |  |
Transfers accounted for as secured borrowings, liabilities | 1 | 1 |  |
Reverse secured borrowings, liabilities | 1 | 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 | 0 |  |
Reverse secured borrowings, liabilities | 4,284 | 5,607 |  |
Residential Mortgage | Trust 2019-2 | HECM Securitizations (HMBS) |  |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |  |
Transfers accounted for as secured borrowings, liabilities | 0 | 0 |  |
Reverse secured borrowings, liabilities | 333 | 0 |  |
Residential Mortgage | Trust 2019-1 | HECM Securitizations (HMBS) |  |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |  |
Transfers accounted for as secured borrowings, liabilities | 0 | 0 |  |
Reverse secured borrowings, liabilities | 302 | 0 |  |
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 | 0 |  |
Reverse secured borrowings, liabilities | 209 | 326 |  |
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 | 0 |  |
Reverse secured borrowings, liabilities | 148 | 250 |  |
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 | 0 |  |
Reverse secured borrowings, liabilities | 0 | 284 |  |
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 | 0 |  |
Reverse secured borrowings, liabilities | 0 | 231 |  |
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 | 0 | 29 |  |
Reverse secured borrowings, liabilities | $ 0 | $ 0 |  |

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