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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
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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- Definition

Schedule Of Identifiable Assets By Segment [Line Items]

+ References

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Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
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-URI http://asc.fasb.org/extlink&oid=109222160&loc=SL51721533-107759

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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760

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