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Acquisitions and Divestitures (Details ) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2015
Dec. 31, 2014
Exxon Exchange II [Member]        
Exchanges of Properties and Divestiture        
Gain (loss) on sale of oil and natural gas property       $ 30
Exxon Exchange I [Member]        
Exchanges of Properties and Divestiture        
Gain (loss) on sale of oil and natural gas property       34
Permian basin assets [Member]        
Exchanges of Properties and Divestiture        
Proceeds from sale of assets       352
Costs associated with the sale of oil and natural gas property and equipment       2
Gain (loss) on sale of oil and natural gas property       $ 50
Linn Energy, LLC [Member]        
Exchanges of Properties and Divestiture        
Capital expenditures paid by affiliate   $ 58 $ 223  
Settlement of advance to affiliate $ 129