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Other Assets - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Feb. 01, 2019 | Aug. 01, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Loans subject to repurchase from Ginnie Mae |  |  | $ 629 | $ 266 |  |
Goodwill |  |  | 120 | 23 |  |
Goodwill adjustment |  |  | 55 |  |  |
Goodwill acquired |  |  | 42 |  |  |
REO loans with government guarantee |  |  | 8 | 10 |  |
Pacific Union |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Loans subject to repurchase from Ginnie Mae |  |  | 418 |  |  |
Goodwill | $ 40 |  |  |  | $ 40 |
Intangible assets acquired |  |  | 13 |  |  |
Goodwill adjustment | $ 11 |  |  |  |  |
Seterus |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Intangible assets acquired |  |  | 2 |  |  |
Nationstar Mortgage Holdings Inc. |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Goodwill |  |  | 65 | 10 |  | $ 65
Intangible assets acquired |  |  |  | 103 |  |
Goodwill adjustment |  | $ 55 | $ 55 |  |  |
Goodwill acquired |  |  |  | 10 |  |
Assurant Mortgage Solutions Group |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Intangible assets acquired |  |  |  | 24 |  |
Goodwill acquired |  |  |  | $ 13 |  |

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