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Segment, Other Supplemental Information and Concentrations - Schedule of Property and Equipment by Geographic Area (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Schedule Of Identifiable Assets By Segment [Line Items] |  |
Property and equipment, net | $ 295 | $ 162
United States |  |
Schedule Of Identifiable Assets By Segment [Line Items] |  |
Property and equipment, net | 226 | 119
Americas (excluding United States) |  |
Schedule Of Identifiable Assets By Segment [Line Items] |  |
Property and equipment, net | 18 | 11
International |  |
Schedule Of Identifiable Assets By Segment [Line Items] |  |
Property and equipment, net | $ 51 | $ 32

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