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Long-Term Incentive Compensation Plans:Stock-Based Compensation (Details) shares in Millions	1 Months Ended
	Feb. 28, 2018 stock_awards	Feb. 28, 2017 stock_awards	Feb. 29, 2016 stock_awards	Dec. 31, 2018 shares
Compensation Related Costs [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized				3.7
Number of types of stock-based awards granted (in types) | stock_awards	2	2	2
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant				2.6

X

- Definition

The number of types of stock-based awards granted during the period.

+ References

No definition available.

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- References

No definition available.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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