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v3.20.2

Reverse Mortgage Interests, Net - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Accounting standards update |  |  | us-gaap:AccountingStandardsUpdate201613Member |  | us-gaap:AccountingStandardsUpdate201613Member
Interest earned on HECM loans |  |  | $ 158,000,000 | $ 241,000,000 |
Unsecuritized HECM |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Interest earned on HECM loans | $ 41,000,000 | $ 74,000,000 |  |  |
Participating Interests in HMBS |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
UPB securitized |  |  | 134,000,000 | 211,000,000 |
Government National Mortgage Association (GNMA) Insured Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
UPB securitized |  |  | 0 | 61,000,000 |
Trust 2020-1 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
UPB securitized |  |  | 516,000,000 |  |
2018-02 and 2018-03 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
UPB securitized |  |  | 337,000,000 |  |
Trust 2019-1 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
UPB securitized |  |  |  | 398,000,000 |
Trust 2017-2 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
UPB called |  |  |  | 249,000,000 |
Trust 2018-3 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
UPB sold |  |  |  | 20,000,000 |
Reverse mortgage interests, unsecuritized | HECM |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Repurchase of HECM loans |  |  | 912,000,000 | 2,132,000,000 |
Repurchase of HECM loans funded by prior servicer |  |  | 244,000,000 | 561,000,000 |
Housing and urban development, home equity conversion mortgage loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Unsecuritized interests |  |  | $ 630,000,000 | $ 1,458,000,000 |

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