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Acquisitions - Narrative (Details) |  |  |  |  | 3 Months Ended | 5 Months Ended | 7 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2019 USD ($) | Oct. 10, 2018 | Aug. 01, 2018 USD ($) | Jul. 31, 2018 USD ($) $ / shares shares | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jul. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2019 USD ($) | Jul. 13, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preliminary goodwill |  |  |  |  |  | $ 23,000,000 |  | $ 120,000,000 | $ 23,000,000 |  |  |
Payables and other liabilities |  |  |  |  |  | (68,000,000) | $ 88,000,000 | (85,000,000) |  | $ (193,000,000) |  |
Debt issuance costs |  |  |  |  |  | 68,000,000 |  | 10,000,000 | 68,000,000 |  |  |
Reverse stock split ratio |  | 0.0833 |  |  |  |  |  |  |  |  |  |
Pacific Union Financial, LLC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration | $ 116,000,000 |  |  |  |  |  |  |  |  |  |  |
Preliminary goodwill | 40,000,000 |  |  |  |  |  |  |  |  |  |  |
Acquisition costs |  |  |  |  |  |  |  | 4,000,000 |  |  |  |
Revenue of acquiree |  |  |  |  |  |  |  | 280,000,000 |  |  |  |
Earnings (loss) of acquiree |  |  |  |  |  |  |  | 140,000,000 |  |  |  |
Intangible assets acquired |  |  |  |  |  |  |  | 13,000,000 |  |  |  |
WMIH Corp And Wand Merger Corporation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Right to receive in cash (in dollars per share) | $ / shares |  |  |  | $ 18 |  |  | $ 18 |  |  |  |  |
Right to receive in shares (shares) | shares |  |  |  | 12.7793 |  |  | 12.7793 |  |  |  |  |
Acquisition costs |  |  |  | $ 92,000,000 |  |  | $ 92,000,000 |  |  |  |  |
Debt issuance costs |  |  |  | $ 38,000,000 |  |  | 38,000,000 |  |  |  |  |
Reverse stock split ratio |  |  |  | 0.0833 |  |  |  |  |  |  |  |
Nationstar Mortgage Holdings Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  | $ 1,226,000,000 |  |  |  |  |  |  |  |  |
Preliminary goodwill |  |  | 65,000,000 |  |  | 10,000,000 |  | 65,000,000 | 10,000,000 |  |  |
Estimated consideration |  |  | 1,777,000,000 |  |  |  |  |  |  |  |  |
Stock consideration |  |  | 551,000,000 |  |  |  |  |  |  |  |  |
Decrease in reverse mortgage interests |  |  |  |  | $ 24,000,000 |  |  |  |  |  |  |
Reduction in reverse mortgage servicing rights |  |  |  |  | 6,000,000 |  |  |  |  |  |  |
Increase in mortgage servicing liabilities |  |  |  |  | 37,000,000 |  |  |  |  |  |  |
Payables and other liabilities |  |  |  |  | (12,000,000) |  |  |  |  |  |  |
Adjustments to goodwill |  |  |  |  | $ 55,000,000 |  |  | 55,000,000 |  |  |  |
Intangible assets acquired |  |  |  |  |  |  |  |  | 103,000,000 |  |  |
Intangible assets |  |  | 103,000,000 |  |  |  |  |  |  |  |  |
Assurant Mortgage Solutions Group |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  |  |  |  | 24,000,000 |  |  |
Nationstar Mortgage Holdings Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preliminary goodwill |  |  |  | $ 72,000,000 |  |  | 72,000,000 |  |  | $ 72,000,000 |  |
Acquisition costs |  |  |  |  |  | 10,000,000 | 27,000,000 |  |  |  |  |
Adjustments to goodwill |  |  |  |  |  |  | 0 |  |  |  |  |
Xome Holdings LLC | Assurant Mortgage Solutions Group |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  | 38,000,000 |  |  |  |  |  |  |  |  |
Preliminary goodwill |  |  |  |  |  | 13,000,000 |  |  | 13,000,000 |  |  |
Estimated consideration |  |  | $ 53,000,000 |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  | 15,000,000 |  |  | 15,000,000 |  | $ 0 |
Intangible assets |  |  |  |  |  | $ 24,000,000 |  |  | $ 24,000,000 |  |  |
Final purchase price adjustment |  |  |  |  |  |  |  | 15,000,000 |  |  |  |
8.125% Due July 2023 |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  |  | $ 950,000,000
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 8.125%
9.125% Due July 2026 |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 9.125%
KKR Capital Markets LLC | WMIH Corp And Wand Merger Corporation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs |  |  |  | 25,000,000 |  |  | 25,000,000 |  |  |  |  |
KCM | WMIH Corp And Wand Merger Corporation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs |  |  |  | 7,000,000 |  |  | $ 7,000,000 |  |  |  |  |
Payment for conversion fee |  |  |  | $ 8,000,000 |  |  |  |  |  |  |  |
Originations | Pacific Union Financial, LLC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preliminary goodwill | 28,000,000 |  |  |  |  |  |  |  |  |  |  |
Servicing | Pacific Union Financial, LLC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preliminary goodwill | $ 12,000,000 |  |  |  |  |  |  |  |  |  |  |
Salaries, Wages and Benefits | Pacific Union Financial, LLC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs |  |  |  |  |  |  |  | 2,000,000 |  |  |  |
General and Administrative Expense | Pacific Union Financial, LLC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |

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