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Stockholders' Equity - Summary of Unrecognized Compensation Expense (Detaills) $ in Millions | 12 Months Ended
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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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- Definition 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 + Details
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- Definition 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 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested 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 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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