Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Removal of goodwill for asset divestitures		$ 197
Customer Relationships [Member]
Goodwill [Line Items]
Weighted average amortization period, other intangible assets		14 years
Amortization expense of intangible assets		$ 117	$ 56	$ 36
Amortization Expense, Next Five Years		118
General Partner And EnLink [Member]
Goodwill [Line Items]
Impairment of intangible assets			$ 223
General Partner And EnLink [Member] | Crude And Condensate [Member]
Goodwill [Line Items]
Impairment of intangible assets	$ 223
Upstream Oil And Gas Assets [Member]
Goodwill [Line Items]
Removal of goodwill for asset divestitures		$ 197