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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