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Securitizations and Financings - Assets and Liabilities of Consolidated VIEs (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Purchase discount | $ 62 | $ 46
Residential mortgage |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Assets - transfers accounted for as secured borrowings | 474 | 606
Assets - reverse secured borrowings | 4,628 | 5,272
Liabilities - transfers accounted for as secured borrowings | 347 | 360
Liabilities - reverse secured borrowings | 4,665 | 5,277
Residential mortgage | Restricted cash |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Assets - transfers accounted for as secured borrowings | 44 | 66
Assets - reverse secured borrowings | 25 | 42
Residential mortgage | Reverse mortgage interests |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Assets - transfers accounted for as secured borrowings | 0 | 0
Assets - reverse secured borrowings | 4,603 | 5,230
Residential mortgage | Advances and other receivables, net |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Assets - transfers accounted for as secured borrowings | 430 | 540
Assets - reverse secured borrowings | 0 | 0
Residential mortgage | Advance facilities |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Liabilities - transfers accounted for as secured borrowings | 347 | 359
Liabilities - reverse secured borrowings | 0 | 0
Residential mortgage | Payables and other liabilities |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Liabilities - transfers accounted for as secured borrowings | 0 | 1
Liabilities - reverse secured borrowings | 0 | 1
Residential mortgage | Participating interest financing |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Liabilities - transfers accounted for as secured borrowings | 0 | 0
Liabilities - reverse secured borrowings | 3,664 | 4,284
Residential mortgage | Trust 2020-1 | HECM Securitizations (HMBS) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Liabilities - transfers accounted for as secured borrowings | 0 | 0
Liabilities - reverse secured borrowings | 516 | 0
Residential mortgage | Trust 2019-2 | HECM Securitizations (HMBS) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Liabilities - transfers accounted for as secured borrowings | 0 | 0
Liabilities - reverse secured borrowings | 259 | 333
Residential mortgage | Trust 2019-1 | HECM Securitizations (HMBS) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Liabilities - transfers accounted for as secured borrowings | 0 | 0
Liabilities - reverse secured borrowings | 226 | 302
Residential mortgage | Trust 2018-3 | HECM Securitizations (HMBS) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Liabilities - transfers accounted for as secured borrowings | 0 | 0
Liabilities - reverse secured borrowings | 0 | 209
Residential mortgage | Trust 2018-2 | HECM Securitizations (HMBS) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Liabilities - transfers accounted for as secured borrowings | 0 | 0
Liabilities - reverse secured borrowings | $ 0 | $ 148

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