Employee Share-Based Incentives - Employee Share-Based Awards (Details) shares in Millions	12 Months Ended
Dec. 31, 2018 shares
Long-Term Incentive Plan
Employee stock-based awards general disclosures
Shares of common stock available for issuance (in shares)	86
PSUs
Employee stock-based awards general disclosures
Award vesting period	3 years
Holding period	2 years
Combined vesting and holding period	5 years
PSUs \| Minimum
Employee stock-based awards general disclosures
Award vesting percentage	0.00%
PSUs \| Maximum
Employee stock-based awards general disclosures
Award vesting percentage	150.00%
Stock Appreciation Rights (SARs)
Employee stock-based awards general disclosures
Award expiration period	10 years
1st 50% \| RSUs
Employee stock-based awards general disclosures
Award vesting period	2 years
Award vesting percentage	50.00%
2nd 50% \| RSUs
Employee stock-based awards general disclosures
Award vesting period	3 years
Award vesting percentage	50.00%

Share-based Compensation Arrangement by Share-based Payment Award, Award Holding Period

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting and Holding Period

+ References

No definition available.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Percentage of vesting of share-based compensation awards.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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