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Equity and Distributions, Noncontrolling Interests (Details) - Jun. 30, 2015 - USD ($)
$ in Billions
Total
Noncontrolling Interest  
Noncontrolling interests acquired $ 1.4
Panola Pipeline Company, LLC [Member]  
Noncontrolling Interest  
Noncontrolling Interest, Ownership Percentage by Parent (in hundredths) 55.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners (in hundredths) 45.00%
Anadarko Petroleum Corporation [Member] | Panola Pipeline Company, LLC [Member]  
Noncontrolling Interest  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners (in hundredths) 15.00%
DCP Midstream Partners, LP [Member] | Panola Pipeline Company, LLC [Member]  
Noncontrolling Interest  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners (in hundredths) 15.00%
MarkWest Energy Partners, L.P. [Member] | Panola Pipeline Company, LLC [Member]  
Noncontrolling Interest  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners (in hundredths) 15.00%