Stock-Based Compensation Introduction Narrative (Details) shares in Millions	9 Months Ended
Sep. 30, 2015 Performance_metrics shares
Shares authorized for issuance under the plan (in shares)	9.6
Shares available for future grant under the plan (in shares)	1.4
Performance Share Units
Award Vesting Period	3 years
Number of Performance Metrics \| Performance_metrics	2
The first performance metric \| Performance_metrics	1
Restricted Stock Units
Award Vesting Period	3 years
Annual Vesting Percentage	33.33%
Options
Award Vesting Period	4 years
Annual Vesting Percentage	25.00%
Contractual Term	10 years
RTSR [Member] \| Minimum [Member] \| Performance Share Units
Award Vesting Rights Percentage	0.00%
RTSR [Member] \| Maximum [Member] \| Performance Share Units
Award Vesting Rights Percentage	175.00%
Cumulative Free Cash Flow [Member] \| Minimum [Member] \| Performance Share Units
Award Vesting Rights Percentage	0.00%
Cumulative Free Cash Flow [Member] \| Maximum [Member] \| Performance Share Units
Award Vesting Rights Percentage	200.00%

Number of performance metrics

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- Definition

Annual percentage of vesting of share-based compensation awards.

+ References

No definition available.

+ Details

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The first performance metric

+ References

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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

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ 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)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ 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=6415400&loc=d3e5070-113901

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- Definition

Percentage of vesting of share-based compensation awards.

+ References

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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

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