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Securitizations and Financings - Assets and Liabilities of Consolidated VIEs (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
UPB, purchase discount | $ 61 | $ 46
Residential Mortgage |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers accounted for as secured borrowings, assets | 488 | 606
Reverse secured borrowings, assets | 4,379 | 5,272
Transfers accounted for as secured borrowings, liabilities | 359 | 360
Reverse secured borrowings, liabilities | 4,416 | 5,277
Residential Mortgage | Restricted cash |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers accounted for as secured borrowings, assets | 47 | 66
Reverse secured borrowings, assets | 23 | 42
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 | 441 | 540
Reverse secured borrowings, assets | 0 | 0
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 | 0
Reverse secured borrowings, assets | 4,356 | 5,230
Residential Mortgage | Advance facilities |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers accounted for as secured borrowings, liabilities | 358 | 359
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 | 0 | 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 | 3,473 | 4,284
Residential Mortgage | Trust 2020-1 | 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 | 490 | 0
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 | 241 | 333
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 | 212 | 302
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 | 0 | 209
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 | $ 0 | $ 148

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