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Reverse Mortgage Interests, Net - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 5 Months Ended | 7 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 31, 2018 | Dec. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2017 | Aug. 01, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
UPB, purchase discount | $ 82 | $ 42 | $ 82 | $ 46 | $ 89 |
Unsecuritized HECM |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Interest earned on HECM loans | 274 | 206 |  | 307 | $ 490 |
Participating Interests in HMBS |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
UPB securitized |  | 107 | 198 | 265 |  |
Government National Mortgage Association (GNMA) Insured Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
UPB securitized |  |  |  | 61 |  |
Trust 2019-1 and Trust 2019-2 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
UPB securitized |  |  |  | 751 |  |
Trust 2017-2 and Trust 2018-1 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
UPB securitized |  |  |  | 476 |  |
Trust 2018-3 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
UPB securitized |  | 364 |  |  |  |
Unpaid principal balance sold |  |  |  | 20 |  |
Trust 2017-1 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
UPB securitized |  | 188 |  |  |  |
Reverse Mortgage Interests, Unsecuritized | HECM |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Repurchase of HECM loans |  | 1,429 | 2,439 | 2,333 |  |
Repurchase of HECM loans funded by prior servicer |  | 328 | 512 | 616 |  |
Housing And Urban Development, Home Equity Conversion Mortgage Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
HECM loans assigned to HUD |  | 1,493 | 1,712 | 1,819 |  |
Other Interest Securitized and Unsecuritized Interests |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
UPB, purchase discount |  |  |  |  |  | $ 298
Mortgage-backed debt |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Unamortized premium |  | 58 |  | 10 |  |
Mortgage-backed debt | Participating Interests in HMBS |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Unamortized premium | $ 58 | $ 58 | 58 | $ 10 |  | $ 42
Nationstar Mortgage Holdings Inc. | Trust 2018-1 and Trust 2018-2 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
UPB securitized |  |  | 760 |  |  |
Nationstar Mortgage Holdings Inc. | Trust 2016-2 and Trust 2016-3 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
UPB securitized |  |  | $ 284 |  |  |

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