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Stock-Based Compensation - Additional Information (Details) $ in Millions	9 Months Ended
	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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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

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

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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.

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