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Acquisitions - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 01, 2019 | Jun. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 120 | $ 120 | $ 23
Goodwill adjustment |  |  | 55 |
Pacific Union |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash consideration | $ 116 |  |  |
Goodwill | 40 | 40 | 40 |
Increase to payables and other liabilities |  | 11 |  |
Increase to fair value of intangible assets |  | (2) |  |
Property and equipment wrote off |  | 2 |  |
Goodwill adjustment |  | 11 |  |
Acquisition costs |  | 2 | 4 |
Revenue since acquisition |  | 79 | 118 |
Income from acquisition |  | 36 | 50 |
Salaries, Wages and Benefits | Pacific Union |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition costs |  | 1 | 2 |
General and Administrative Expense | Pacific Union |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition costs |  | 1 | 2 |
Originations Segment | Pacific Union |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | 28 | 28 |
Servicing Segment | Pacific Union |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 12 | $ 12 |
Minimum | Pacific Union |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Change in contingent consideration | 0 |  |  |
Maximum | Pacific Union |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Change in contingent consideration | $ 16 |  |  |

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