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Acquisitions and Divestitures - Subsequent Event (Details) - Woodford Shale assets (East Hoss Assets)
Mcfe in Millions, $ in Millions
3 Months Ended
Mar. 31, 2016
Mcfe
Apr. 20, 2016
USD ($)
Dec. 31, 2015
Mcfe
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Production (energy) 0.9    
Proved reserves     19.0
Subsequent Event      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net proceeds from sale of a majority of interests | $   $ 18