Share-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation	$ 45	$ 68
Restructuring and transaction costs	247
EnLink [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation	6	$ 12
Accelerated Vesting Of Share-Based Grants For Employees [Member] | Reduction Of Workforce [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restructuring and transaction costs	$ 67