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Securitizations and Financings - Assets and Liabilities of Consolidated VIEs (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 USD ($) special_purpose_entity | Dec. 31, 2018 USD ($)
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Number of SPEs | special_purpose_entity | 4 |
Assets | $ 622 | $ 816
Reverse Secured Borrowings, Assets, Carrying Amount | 5,517 | 6,791
Liabilities | 450 | 535
Reverse Secured Borrowings, Liabilities, Carrying Amount | 5,522 | 6,699
Purchase discount | 49 | 42
Residential Mortgage | Restricted cash |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Assets | 70 | 70
Reverse Secured Borrowings, Assets, Carrying Amount | 46 | 63
Residential Mortgage | Reverse mortgage interests |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Assets | 0 | 0
Reverse Secured Borrowings, Assets, Carrying Amount | 5,471 | 6,728
Residential Mortgage | Advances and other receivables, net |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Assets | 552 | 628
Reverse Secured Borrowings, Assets, Carrying Amount | 0 | 0
Residential Mortgage | Mortgage loans held for investment, net |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Assets | 0 | 118
Reverse Secured Borrowings, Assets, Carrying Amount | 0 | 0
Residential Mortgage | Advance facilities |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Liabilities | 449 | 505
Reverse Secured Borrowings, Liabilities, Carrying Amount | 0 | 0
Residential Mortgage | Payables and other liabilities |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Liabilities | 1 | 1
Reverse Secured Borrowings, Liabilities, Carrying Amount | 1 | 1
Residential Mortgage | Participating interest financing |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Liabilities | 0 | 0
Reverse Secured Borrowings, Liabilities, Carrying Amount | 4,581 | 5,607
Residential Mortgage | Trust 2017-2 | Other non-recourse debt |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Liabilities | 0 | 0
Reverse Secured Borrowings, Liabilities, Carrying Amount | 0 | 231
Residential Mortgage | Trust 2018-1 | Other non-recourse debt |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Liabilities | 0 | 0
Reverse Secured Borrowings, Liabilities, Carrying Amount | 201 | 284
Residential Mortgage | Trust 2018-2 | Other non-recourse debt |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Liabilities | 0 | 0
Reverse Secured Borrowings, Liabilities, Carrying Amount | 161 | 250
Residential Mortgage | Trust 2018-3 | Other non-recourse debt |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Liabilities | 0 | 0
Reverse Secured Borrowings, Liabilities, Carrying Amount | 239 | 326
Residential Mortgage | Trust 2019-1 | Other non-recourse debt |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Liabilities | 0 | 0
Reverse Secured Borrowings, Liabilities, Carrying Amount | 339 | 0
Residential Mortgage | Other nonrecourse debt |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Liabilities | 0 | 29
Reverse Secured Borrowings, Liabilities, Carrying Amount | $ 0 | $ 0

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