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Reverse Mortgage Interests, Net - Narrative (Details) - USD ($) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 7 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2019 | Jul. 31, 2018 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Aug. 01, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
UPB securitized |  | $ 0 |  |  |  |  |  |  |  |
Purchase discount |  |  | $ 49,000,000 |  | $ 49,000,000 |  | $ 42,000,000 |  |  |
Unsecuritized HECM |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Interest earned on HECM loans |  | 72,000,000 | 74,000,000 |  | 241,000,000 |  |  |  |  |
Participating Interests in HMBS |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
UPB securitized |  | 44,000,000 | 211,000,000 |  | 211,000,000 |  |  |  |  |
GNMA |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
UPB securitized |  |  | 61,000,000 |  | 61,000,000 |  |  |  |  |
Trust 2019-1 |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
UPB securitized |  |  | 398,000,000 |  | 398,000,000 |  |  |  |  |
Trust 2017-2 |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
UPB securitized |  |  | 249,000,000 |  | 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 |  | 608,000,000 |  |  | 2,132,000,000 |  |  |  |  |
Repurchase of HECM loans funded by prior servicer |  | 138,000,000 |  |  | 561,000,000 |  |  |  |  |
HECM Loans, HUD |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Unsecuritized interests |  | 458,000,000 |  |  | 1,458,000,000 |  |  |  |  |
Other Interest Securitized and Unsecuritized Interests |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase discount |  |  |  |  |  |  |  | $ 298,000,000 |  |
Receivables From Prior Servicers, Reverse Mortgage Interests |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Account receivables |  |  | 8,000,000 |  | 8,000,000 |  | 18,000,000 |  |  |
Mortgage-backed debt |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Debt premium |  |  | 14,000,000 |  | 14,000,000 |  | 58,000,000 |  |  |
Mortgage-backed debt | Participating Interests in HMBS |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Debt premium | $ 58,000,000 | $ 55,000,000 | $ 14,000,000 | $ 58,000,000 | $ 14,000,000 | $ 18,000,000 | $ 58,000,000 | $ 42,000,000 |  |
Nationstar Mortgage Holdings Inc. |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase discount | 82,000,000 |  |  | 82,000,000 |  |  |  |  | $ 84,000,000 | $ 89,000,000
Nationstar Mortgage Holdings Inc. | Unsecuritized HECM |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Interest earned on HECM loans | 38,000,000 |  |  | 274,000,000 |  |  |  |  |  |
Nationstar Mortgage Holdings Inc. | Participating Interests in HMBS |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
UPB securitized | 198,000,000 |  |  | 198,000,000 |  |  |  |  |  |
Nationstar Mortgage Holdings Inc. | Trust 2018-1 and Trust 2018-2 |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
UPB securitized | 760,000,000 |  |  | 760,000,000 |  |  |  |  |  |
Nationstar Mortgage Holdings Inc. | Trust 2016-2 and Trust 2016-3 |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
UPB securitized | $ 284,000,000 |  |  | 284,000,000 |  |  |  |  |  |
Nationstar Mortgage Holdings Inc. | Reverse Mortgage Interests, Unsecuritized | HECM |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase of HECM loans |  |  |  | 2,439,000,000 |  |  |  |  |  |
Repurchase of HECM loans funded by prior servicer |  |  |  | 512,000,000 |  |  |  |  |  |
Nationstar Mortgage Holdings Inc. | HECM Loans, HUD |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Unsecuritized interests |  |  |  | $ 1,712,000,000 |  |  |  |  |  |

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