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Acquisition (Notes)	6 Months Ended
Acquisition (Notes)	Jun. 30, 2016
Acquisitions [Abstract]
Business Combination Disclosure [Text Block]	Acquisitions In June 2016, we executed a purchase agreement to acquire PayRock Energy Holdings, LLC ("PayRock"), a portfolio company of EnCap Investments, which closed on August 1, 2016 for $888 million, subject to closing adjustments. PayRock has approximately 61,000

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

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