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Reverse Mortgage Interests, Net - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Aug. 01, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Fair Value | $ 25 |  | $ 25 |  | $ 22 |
Purchase discount | 59 |  | 59 |  | $ 46 |
Interest earned on HECM loans |  |  | 117 | $ 167 |  |
Unsecuritized HECM |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Interest earned on HECM loans | $ 55 | $ 85 |  |  |  |
Participating Interests in HMBS |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
UPB securitized |  |  | 95 | 149 |  |
Government National Mortgage Association (GNMA) Insured Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
UPB securitized |  |  |  | 61 |  |
Trust 2019-1 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
UPB securitized |  |  |  | 398 |  |
Trust 2017-2 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
UPB called |  |  |  | 249 |  |
Trust 2018-3 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
UPB sold |  |  |  | 20 |  |
Reverse mortgage interests, unsecuritized | HECM |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Repurchase of HECM loans |  |  | 686 | 1,457 |  |
Repurchase of HECM loans funded by prior servicer |  |  | 186 | 371 |  |
Housing and urban development, home equity conversion mortgage loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Unsecuritized interests |  |  | $ 461 | $ 983 |  |
Mortgage-backed debt |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Debt premium |  |  |  |  |  | $ 256

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