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Stock-Based Plans - Range of Exercise Prices and Intrinsic Value Related to Options Outstanding (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Number Options Outstanding (in shares) | shares	5,069,956
Weighted Average Remaining Contractual Life	6 years 3 months 18 days
Weighted Average Exercise Price (in dollars per share)	$ 60.08
Number Options Exercisable (in shares) | shares	3,323,462
Weighted Average Remaining Contractual Life, Exercisable	5 years 2 months 12 days
Weighted Average Exercise Price Per Share (in dollars per share)	$ 63.41
Options outstanding, aggregate intrinsic value | $	$ 6
Options exercisable, aggregate intrinsic value | $	$ 4
$30.46 - $35.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of Exercise Prices, low end of range (in dollars per share)	$ 30.46
Range of Exercise Prices, high end of range (in dollars per share)	$ 35.00
Number Options Outstanding (in shares) | shares	76,750
Weighted Average Remaining Contractual Life	1 year 2 months 12 days
Weighted Average Exercise Price (in dollars per share)	$ 30.46
Number Options Exercisable (in shares) | shares	76,750
Weighted Average Remaining Contractual Life, Exercisable	1 year 2 months 12 days
Weighted Average Exercise Price Per Share (in dollars per share)	$ 30.46
$42.75 - $62.50
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of Exercise Prices, low end of range (in dollars per share)	42.75
Range of Exercise Prices, high end of range (in dollars per share)	$ 62.50
Number Options Outstanding (in shares) | shares	3,940,424
Weighted Average Remaining Contractual Life	6 years 10 months 24 days
Weighted Average Exercise Price (in dollars per share)	$ 56.53
Number Options Exercisable (in shares) | shares	2,193,930
Weighted Average Remaining Contractual Life, Exercisable	5 years 7 months 6 days
Weighted Average Exercise Price Per Share (in dollars per share)	$ 58.74
$68.36 - $80.12
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of Exercise Prices, low end of range (in dollars per share)	68.36
Range of Exercise Prices, high end of range (in dollars per share)	$ 80.12
Number Options Outstanding (in shares) | shares	1,052,782
Weighted Average Remaining Contractual Life	4 years 7 months 6 days
Weighted Average Exercise Price (in dollars per share)	$ 75.54
Number Options Exercisable (in shares) | shares	1,052,782
Weighted Average Remaining Contractual Life, Exercisable	4 years 7 months 6 days
Weighted Average Exercise Price Per Share (in dollars per share)	$ 75.54

X

- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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No definition available.

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ 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 (c)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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://www.xbrl.org/2003/role/presentationRef
-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=96867065&loc=d3e5070-113901

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term of exercisable stock options, 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
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-Paragraph 2
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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ 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 (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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