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Stock-Based Compensation - Additional Information (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2017 USD ($) shares
RSUs |
Share-based Compensation Arrangement by Share-based Payment Award |
Number of shares that RSUs convert into on the applicable vesting date | shares | 1
RSUs granted during the period | shares | 743,926
Fair value of RSUs or restricted stock vested during the period | $ | $ 27
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $ | $ 37
Minimum | Stock Options |
Share-based Compensation Arrangement by Share-based Payment Award |
Stock options expiration period | 6 years
Maximum | RSUs |
Share-based Compensation Arrangement by Share-based Payment Award |
Vesting period | 5 years
Maximum | Stock Options |
Share-based Compensation Arrangement by Share-based Payment Award |
Vesting period | 5 years
Stock options expiration period | 10 years

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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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