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Stockholders' Equity - Narrative (Details) - RSUs - Certain Employees - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Class of Stock [Line Items] |  |  |  |
Shares granted (in shares) |  |  | 2,449 | 1,071
Compensation expense | $ 5 | $ 4 | $ 9 | $ 8
Tranche One |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting percentage |  |  | 33.30% |
Tranche Two |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting percentage |  |  | 33.30% |
Tranche Three |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting percentage |  |  | 33.40% |

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