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Stockholders' Equity - Narrative (Details) - RSUs - Certain Employees - USD ($) shares in Thousands, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Class of Stock [Line Items] |  |
Shares granted (in shares) | 1,873 | 934
Compensation expense | $ 4 | $ 4
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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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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