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Stockholders' Equity - Summary of Unrecognized Compensation Expense (Detaills) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Stock Options
Class of Stock [Line Items]
Unrecognized compensation expense of options, net of forfeitures	$ 0
Unrecognized compensation expense, expected to be recognized over a weighted-average period(in years)	1 month 9 days
RSUs
Class of Stock [Line Items]
Unrecognized compensation expense of awards other than options, net of forfeitures	$ 49
Unrecognized compensation expense, expected to be recognized over a weighted-average period(in years)	2 years 25 days
RSAs
Class of Stock [Line Items]
Unrecognized compensation expense of awards other than options, net of forfeitures	$ 12
Unrecognized compensation expense, expected to be recognized over a weighted-average period(in years)	2 years 5 months 8 days

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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Unrecognized cost of unvested options awarded to employees as compensation.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
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