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Oil and Natural Gas Property Transactions - VPP Transactions Table (Details)
Mcfe in Millions, Mcf in Millions, MBbls in Millions, $ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Mcfe
MBbls
Mcf
Mar. 31, 2012
USD ($)
Mcfe
MBbls
Mcf
Jun. 30, 2011
USD ($)
Dec. 31, 2008
USD ($)
Mcfe
MBbls
Mcf
Sep. 30, 2008
USD ($)
Jun. 30, 2008
USD ($)
Dec. 31, 2007
USD ($)
Mcfe
MBbls
Mcf
May. 31, 2011
Mcfe
MBbls
Mcf
Aug. 31, 2008
Mcfe
MBbls
Mcf
May. 31, 2008
Mcfe
MBbls
Mcf
VPP Transactions [Line Items]                    
Cash Proceeds from Volumetric Production Payment (VPP) | $ $ 4,331                  
Proved Developed Reserves (Energy) | Mcfe 830                  
Oil [Member]                    
VPP Transactions [Line Items]                    
Proved Developed Reserves (Volume) 5.2                  
Natural Gas [Member]                    
VPP Transactions [Line Items]                    
Proved Developed Reserves (Volume) | Mcf 715                  
Natural Gas Liquids [Member]                    
VPP Transactions [Line Items]                    
Proved Developed Reserves (Volume) 14.0                  
VPP 10 Aradarko Basin Granite Wash [Member]                    
VPP Transactions [Line Items]                    
Cash Proceeds from Volumetric Production Payment (VPP) | $   $ 744                
Proved Developed Reserves (Energy) | Mcfe   160                
VPP 10 Aradarko Basin Granite Wash [Member] | Oil [Member]                    
VPP Transactions [Line Items]                    
Proved Developed Reserves (Volume)   3.0                
VPP 10 Aradarko Basin Granite Wash [Member] | Natural Gas [Member]                    
VPP Transactions [Line Items]                    
Proved Developed Reserves (Volume) | Mcf   87                
VPP 10 Aradarko Basin Granite Wash [Member] | Natural Gas Liquids [Member]                    
VPP Transactions [Line Items]                    
Proved Developed Reserves (Volume)   9.2                
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 4 Anadarko and Arkoma Basins [Member]                    
VPP Transactions [Line Items]                    
Cash Proceeds from Volumetric Production Payment (VPP) | $       $ 412            
Proved Developed Reserves (Energy) | Mcfe       98            
VPP 4 Anadarko and Arkoma Basins [Member] | Oil [Member]                    
VPP Transactions [Line Items]                    
Proved Developed Reserves (Volume)       0.5            
VPP 4 Anadarko and Arkoma Basins [Member] | Natural Gas [Member]                    
VPP Transactions [Line Items]                    
Proved Developed Reserves (Volume) | Mcf       95            
VPP 4 Anadarko and Arkoma Basins [Member] | Natural Gas Liquids [Member]                    
VPP Transactions [Line Items]                    
Proved Developed Reserves (Volume)       0.0            
VPP 3 Anadarko Basin [Member]                    
VPP Transactions [Line Items]                    
Cash Proceeds from Volumetric Production Payment (VPP) | $         $ 600          
Proved Developed Reserves (Energy) | Mcfe                 93  
VPP 3 Anadarko Basin [Member] | Oil [Member]                    
VPP Transactions [Line Items]                    
Proved Developed Reserves (Volume)                 0.0  
VPP 3 Anadarko Basin [Member] | Natural Gas [Member]                    
VPP Transactions [Line Items]                    
Proved Developed Reserves (Volume) | Mcf                 93  
VPP 3 Anadarko Basin [Member] | Natural Gas Liquids [Member]                    
VPP Transactions [Line Items]                    
Proved Developed Reserves (Volume)                 0.0  
VPP 2 Texas, Oklahoma and Kansas [Member]                    
VPP Transactions [Line Items]                    
Cash Proceeds from Volumetric Production Payment (VPP) | $           $ 622        
Proved Developed Reserves (Energy) | Mcfe                   94
VPP 2 Texas, Oklahoma and Kansas [Member] | Oil [Member]                    
VPP Transactions [Line Items]                    
Proved Developed Reserves (Volume)                   0.0
VPP 2 Texas, Oklahoma and Kansas [Member] | Natural Gas [Member]                    
VPP Transactions [Line Items]                    
Proved Developed Reserves (Volume) | Mcf                   94
VPP 2 Texas, Oklahoma and Kansas [Member] | Natural Gas Liquids [Member]                    
VPP Transactions [Line Items]                    
Proved Developed Reserves (Volume)                   0.0
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