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Share-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation				$ 182	$ 155
Restructuring charges			$ 2		44
2015 Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance	28,000,000
Number of shares used to calculate shares issued under the 2015 Long-Term Incentive Plan, options and stock appreciation rights	1
Number of shares used to calculate shares issued under the 2015 Long-Term Incentive Plan, other awards	3
EnLink [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation				$ 25	11
General Partner And EnLink [Member] | Restricted Stock Awards And Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation		$ 7
Accelerated Vesting Of Share-Based Grants For Employees [Member] | Canadian Divestitures [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restructuring charges					$ 15

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- Definition

Number Of Shares Used To Calculate Shares Issued Under Plan Options Granted

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Number Of Shares Used To Calculate Shares Issued Under Plan Other Awards

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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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).

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