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Subsequent Event (Details) - Subsequent Event [Member] - Eagle Ford Midstream Assets [Member] - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Jul. 31, 2015	Jun. 30, 2015
Subsequent Event Line Items
Total consideration for acquisition	$ 2,150
First installment	1,150
Second installment	$ 1,000
Description of acquisition		EFS Midstream provides natural gas gathering, treating, compression and condensate gathering and processing services in the Eagle Ford Shale. The EFS Midstream system includes approximately 460 miles of natural gas and condensate gathering pipelines, ten central gathering plants, 780 MMcf/d of natural gas treating capacity and 119 MBPD of condensate stabilization capacity.

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