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Oil and Natural Gas Property Transactions - VPP Transactions Table (Details)
MBbls in Millions, $ in Millions, Mcfe in Billions, Mcf in Billions
3 Months Ended 9 Months Ended
Jun. 30, 2011
USD ($)
Dec. 31, 2007
USD ($)
Mcfe
MBbls
Mcf
Sep. 30, 2016
USD ($)
Mcfe
MBbls
Mcf
May 31, 2011
Mcfe
MBbls
Mcf
VPP Transactions [Line Items]        
Cash Proceeds from Volumetric Production Payment (VPP) | $     $ 1,953  
Proved Developed Reserves (Energy) | Mcfe     385  
Oil [Member]        
VPP Transactions [Line Items]        
Proved Developed Reserves (Volume)     1.7  
Natural Gas [Member]        
VPP Transactions [Line Items]        
Proved Developed Reserves (Volume) | Mcf     346  
Natural Gas Liquids [Member]        
VPP Transactions [Line Items]        
Proved Developed Reserves (Volume)     4.8  
VPP 9 Mid-Continent [Member]        
VPP Transactions [Line Items]        
Cash Proceeds from Volumetric Production Payment (VPP) | $ $ 853      
Proved Developed Reserves (Energy) | Mcfe       177
VPP 9 Mid-Continent [Member] | Oil [Member]        
VPP Transactions [Line Items]        
Proved Developed Reserves (Volume)       1.7
VPP 9 Mid-Continent [Member] | Natural Gas [Member]        
VPP Transactions [Line Items]        
Proved Developed Reserves (Volume) | Mcf       138
VPP 9 Mid-Continent [Member] | Natural Gas Liquids [Member]        
VPP Transactions [Line Items]        
Proved Developed Reserves (Volume)       4.8
VPP 1 Kentucky and West Virginia [Member]        
VPP Transactions [Line Items]        
Cash Proceeds from Volumetric Production Payment (VPP) | $   $ 1,100    
Proved Developed Reserves (Energy) | Mcfe   208    
VPP 1 Kentucky and West Virginia [Member] | Oil [Member]        
VPP Transactions [Line Items]        
Proved Developed Reserves (Volume)   0.0    
VPP 1 Kentucky and West Virginia [Member] | Natural Gas [Member]        
VPP Transactions [Line Items]        
Proved Developed Reserves (Volume) | Mcf   208    
VPP 1 Kentucky and West Virginia [Member] | Natural Gas Liquids [Member]        
VPP Transactions [Line Items]        
Proved Developed Reserves (Volume)   0.0