Deferred tax benefit resulting from release of valuation allowance position; allocated to discontinued operations.

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Income Tax [Line Items]

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Percentage of Deferred Tax Asset that was recorded as a valuation allowance.

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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

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Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of foreign earnings repatriated from subsidiaries outside the country of domicile.

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The amount of estimated interest recognized in the period arising from income tax examinations.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax [Line Items]
U.S. statutory income tax rate	21.00%		35.00%		21.00%	35.00%
Unrecognized tax benefits realized as a result of lapse of certain U.S. federal statues	$ 22
Unrecognized tax benefits, interest as a result of lapse of certain U.S. federal statues	2
Valuation allowance against U.S. deferred tax assets, percent				100.00%			100.00%
Gain on sale of aggregate ownership interest, before-tax	2,607		$ (1)		$ 2,607	$ (1)
Deferred tax benefit resulting from release of valuation allowance position; allocated to discontinued operations	259
Foreign earnings repatriated		$ 92
Current income tax expense	(24)		$ 38		(47)	$ 70
Repatriated Earnings [Member]
Income Tax [Line Items]
Current income tax expense		$ 0
U.S. [Member]
Income Tax [Line Items]
Change in deferred tax valuation allowance				$ 129
Canada [Member]
Income Tax [Line Items]
Change in deferred tax valuation allowance					$ (76)
EnLink and General Partner [Member]
Income Tax [Line Items]
Gain on sale of aggregate ownership interest, before-tax	$ 2,600