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Securitizations and Financings - Assets and Liabilities of Consolidated VIEs (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Purchase discount | $ 53 | $ 61
Residential mortgage |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Assets - transfers accounted for as secured borrowings | 495 | 488
Assets - reverse secured borrowings | 4,186 | 4,379
Liabilities - transfers accounted for as secured borrowings | 337 | 359
Liabilities - reverse secured borrowings | 4,212 | 4,416
Residential mortgage | Restricted cash |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Assets - transfers accounted for as secured borrowings | 80 | 47
Assets - reverse secured borrowings | 27 | 23
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 | 415 | 441
Assets - reverse secured borrowings | 0 | 0
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 | 4,159 | 4,356
Residential mortgage | Advance facilities |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Liabilities - transfers accounted for as secured borrowings | 337 | 358
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 | 0
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 | 3,306 | 3,473
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 | 471 | 490
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 | 232 | 241
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 | $ 203 | $ 212

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