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Oil and Natural Gas Property Transactions - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Business Acquisition [Line Items]    
Proceeds from divestitures of proved and unproved properties $ 62,000,000 $ 21,000,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment 78,000,000  
Corporate Joint Venture [Member]    
Business Acquisition [Line Items]    
Proceeds from divestitures of proved and unproved properties 140,000,000 $ 21,000,000
Corporate VPP [Member]    
Business Acquisition [Line Items]    
Gain (Loss) on Disposition of Other Assets $ 0