Stock Incentive Plan - Summary of Stock Options Activity By Exercise Price Range (Details) shares in Millions	12 Months Ended
Dec. 31, 2018 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding (in shares)	325,584
Remaining Contract life (in years)	4 years 7 months 6 days
4.93
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation, Shares Authorized Under Stock Option Plans, Exercise Price \| $ / shares	$ 4.93
Number Outstanding (in shares)	16,796
Remaining Contract life (in years)	1 month 21 days
13.51
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation, Shares Authorized Under Stock Option Plans, Exercise Price \| $ / shares	$ 13.51
Number Outstanding (in shares)	21,342
Remaining Contract life (in years)	1 year 1 month 17 days
20.25
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation, Shares Authorized Under Stock Option Plans, Exercise Price \| $ / shares	$ 20.25
Number Outstanding (in shares)	21,266
Remaining Contract life (in years)	3 years 1 month 24 days
20.91
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation, Shares Authorized Under Stock Option Plans, Exercise Price \| $ / shares	$ 20.91
Number Outstanding (in shares)	43,934
Remaining Contract life (in years)	4 years 1 month 21 days
22.04
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation, Shares Authorized Under Stock Option Plans, Exercise Price \| $ / shares	$ 22.04
Number Outstanding (in shares)	15,055
Remaining Contract life (in years)	2 years 1 month 24 days
28.67
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation, Shares Authorized Under Stock Option Plans, Exercise Price \| $ / shares	$ 28.67
Number Outstanding (in shares)	80,627
Remaining Contract life (in years)	5 years 1 month 21 days
34.25
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation, Shares Authorized Under Stock Option Plans, Exercise Price \| $ / shares	$ 34.25
Number Outstanding (in shares)	126,564
Remaining Contract life (in years)	6 years 1 month 17 days

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ 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 (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term of outstanding stock options, 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 (e)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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