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Acquisitions and Divestitures, VPP Volume Remaining to Be Delivered (Details)
Jun. 30, 2013
Corporate VPP [Member]
Reserve Volume Remaining
Mcfe
Jun. 30, 2013
Corporate VPP [Member]
Natural Gas
Reserve Volume Remaining
Mcf
Jun. 30, 2013
Corporate VPP [Member]
Oil
Reserve Volume Remaining
MBbls
Jun. 30, 2013
Corporate VPP [Member]
NGL Reserves
Reserve Volume Remaining
MBbls
Jun. 30, 2013
VPP 10 Anadarko Basin Granite Wash [Member]
Reserve Volume Remaining
Mcfe
Jun. 30, 2013
VPP 10 Anadarko Basin Granite Wash [Member]
Natural Gas
Reserve Volume Remaining
Mcf
Jun. 30, 2013
VPP 10 Anadarko Basin Granite Wash [Member]
Oil
Reserve Volume Remaining
MBbls
Jun. 30, 2013
VPP 10 Anadarko Basin Granite Wash [Member]
NGL Reserves
Reserve Volume Remaining
MBbls
Jun. 30, 2013
VPP 9 Mid-Continent [Member]
Reserve Volume Remaining
Mcfe
May 31, 2011
VPP 9 Mid-Continent [Member]
Natural Gas
Mcf
Jun. 30, 2013
VPP 9 Mid-Continent [Member]
Natural Gas
Reserve Volume Remaining
Mcf
May 31, 2011
VPP 9 Mid-Continent [Member]
Oil
MBbls
Jun. 30, 2013
VPP 9 Mid-Continent [Member]
Oil
Reserve Volume Remaining
MBbls
May 31, 2011
VPP 9 Mid-Continent [Member]
NGL Reserves
MBbls
Jun. 30, 2013
VPP 9 Mid-Continent [Member]
NGL Reserves
Reserve Volume Remaining
MBbls
Jun. 30, 2013
VPP 8 Barnett Shale [Member]
Reserve Volume Remaining
Mcfe
Sep. 30, 2010
VPP 8 Barnett Shale [Member]
Natural Gas
Mcf
Jun. 30, 2013
VPP 8 Barnett Shale [Member]
Natural Gas
Reserve Volume Remaining
Mcf
Sep. 30, 2010
VPP 8 Barnett Shale [Member]
Oil
MBbls
Jun. 30, 2013
VPP 8 Barnett Shale [Member]
Oil
Reserve Volume Remaining
MBbls
Sep. 30, 2010
VPP 8 Barnett Shale [Member]
NGL Reserves
MBbls
Jun. 30, 2013
VPP 8 Barnett Shale [Member]
NGL Reserves
Reserve Volume Remaining
MBbls
Jun. 30, 2013
VPP 6 East Texas and Texas Gulf Coast [Member]
Reserve Volume Remaining
Mcfe
Feb. 28, 2010
VPP 6 East Texas and Texas Gulf Coast [Member]
Natural Gas
Mcf
Jun. 30, 2013
VPP 6 East Texas and Texas Gulf Coast [Member]
Natural Gas
Reserve Volume Remaining
Mcf
Feb. 28, 2010
VPP 6 East Texas and Texas Gulf Coast [Member]
Oil
MBbls
Jun. 30, 2013
VPP 6 East Texas and Texas Gulf Coast [Member]
Oil
Reserve Volume Remaining
MBbls
Feb. 28, 2010
VPP 6 East Texas and Texas Gulf Coast [Member]
NGL Reserves
MBbls
Jun. 30, 2013
VPP 6 East Texas and Texas Gulf Coast [Member]
NGL Reserves
Reserve Volume Remaining
MBbls
Jun. 30, 2013
VPP 5 South Texas [Member]
Reserve Volume Remaining
Mcfe
Aug. 31, 2009
VPP 5 South Texas [Member]
Natural Gas
Mcf
Jun. 30, 2013
VPP 5 South Texas [Member]
Natural Gas
Reserve Volume Remaining
Mcf
Aug. 31, 2009
VPP 5 South Texas [Member]
Oil
MBbls
Jun. 30, 2013
VPP 5 South Texas [Member]
Oil
Reserve Volume Remaining
MBbls
Aug. 31, 2009
VPP 5 South Texas [Member]
NGL Reserves
MBbls
Jun. 30, 2013
VPP 5 South Texas [Member]
NGL Reserves
Reserve Volume Remaining
MBbls
Jun. 30, 2013
VPP 4 Anadarko and Arkoma Basins [Member]
Reserve Volume Remaining
Mcfe
Dec. 31, 2008
VPP 4 Anadarko and Arkoma Basins [Member]
Natural Gas
Mcf
Jun. 30, 2013
VPP 4 Anadarko and Arkoma Basins [Member]
Natural Gas
Reserve Volume Remaining
Mcf
Dec. 31, 2008
VPP 4 Anadarko and Arkoma Basins [Member]
Oil
MBbls
Jun. 30, 2013
VPP 4 Anadarko and Arkoma Basins [Member]
Oil
Reserve Volume Remaining
MBbls
Dec. 31, 2008
VPP 4 Anadarko and Arkoma Basins [Member]
NGL Reserves
MBbls
Jun. 30, 2013
VPP 4 Anadarko and Arkoma Basins [Member]
NGL Reserves
Reserve Volume Remaining
MBbls
Jun. 30, 2013
VPP 3 Anadarko Basin [Member]
Reserve Volume Remaining
Mcfe
Aug. 31, 2008
VPP 3 Anadarko Basin [Member]
Natural Gas
Mcf
Jun. 30, 2013
VPP 3 Anadarko Basin [Member]
Natural Gas
Reserve Volume Remaining
Mcf
Aug. 31, 2008
VPP 3 Anadarko Basin [Member]
Oil
MBbls
Jun. 30, 2013
VPP 3 Anadarko Basin [Member]
Oil
Reserve Volume Remaining
MBbls
Aug. 31, 2008
VPP 3 Anadarko Basin [Member]
NGL Reserves
MBbls
Jun. 30, 2013
VPP 3 Anadarko Basin [Member]
NGL Reserves
Reserve Volume Remaining
MBbls
Jun. 30, 2013
VPP 2 Texas, Oklahoma and Kansas [Member]
Reserve Volume Remaining
Mcfe
May 31, 2008
VPP 2 Texas, Oklahoma and Kansas [Member]
Natural Gas
Mcf
Jun. 30, 2013
VPP 2 Texas, Oklahoma and Kansas [Member]
Natural Gas
Reserve Volume Remaining
Mcf
May 31, 2008
VPP 2 Texas, Oklahoma and Kansas [Member]
Oil
MBbls
Jun. 30, 2013
VPP 2 Texas, Oklahoma and Kansas [Member]
Oil
Reserve Volume Remaining
MBbls
May 31, 2008
VPP 2 Texas, Oklahoma and Kansas [Member]
NGL Reserves
MBbls
Jun. 30, 2013
VPP 2 Texas, Oklahoma and Kansas [Member]
NGL Reserves
Reserve Volume Remaining
MBbls
Jun. 30, 2013
VPP 1 Kentucky and West Virginia [Member]
Reserve Volume Remaining
Mcfe
Dec. 31, 2007
VPP 1 Kentucky and West Virginia [Member]
Natural Gas
Mcf
Jun. 30, 2013
VPP 1 Kentucky and West Virginia [Member]
Natural Gas
Reserve Volume Remaining
Mcf
Dec. 31, 2007
VPP 1 Kentucky and West Virginia [Member]
Oil
MBbls
Jun. 30, 2013
VPP 1 Kentucky and West Virginia [Member]
Oil
Reserve Volume Remaining
MBbls
Dec. 31, 2007
VPP 1 Kentucky and West Virginia [Member]
NGL Reserves
MBbls
Jun. 30, 2013
VPP 1 Kentucky and West Virginia [Member]
NGL Reserves
Reserve Volume Remaining
MBbls
Acquisitions, Divestitures, Joint Ventures, VPP's [Line Items]                                                                                                                                
Contract Term         104 months       92 months             26 months             79 months             43 months             42 months             73 months             70 months             114 months            
Proved Developed Reserves (Volume)   530,000,000,000 3,500,000 9,900,000   61,000,000,000 1,900,000 6,700,000   138,000,000,000 94,000,000,000 1,700,000 1,100,000 4,800,000 3,200,000   390,000,000,000 129,000,000,000 0 0 0 0   44,000,000,000 24,000,000,000 300,000 200,000 0 0   67,000,000,000 20,000,000,000 200,000 100,000 0 0   95,000,000,000 30,000,000,000 500,000 200,000 0 0   93,000,000,000 35,000,000,000 0 0 0 0   94,000,000,000 25,000,000,000 0 0 0 0   208,000,000,000 112,000,000,000 0 0 0 0
Proved Developed Reserves (Energy) 610,500,000,000       112,800,000,000       119,700,000,000             128,600,000,000             24,700,000,000             20,900,000,000             30,700,000,000             35,000,000,000             25,600,000,000             112,500,000,000