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Securitizations and Financings - Assets and Liabilities of Consolidated VIEs (Details) - Residential mortgage - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Assets - transfers accounted for as secured borrowings | $ 410 | $ 488
Liabilities - transfers accounted for as secured borrowings | 304 | 359
Restricted cash |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Assets - transfers accounted for as secured borrowings | 40 | 47
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 | 370 | 441
Advance facilities, net(1) |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Liabilities - transfers accounted for as secured borrowings | 304 | 358
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

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