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Equity and Distributions, Noncontrolling Interests (Details) $ in Billions | 9 Months Ended
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Sep. 30, 2015 USD ($)
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%

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