Oil and Natural Gas Property Transactions - VPP Volume Remaining to Be Delivered Table (Details) | 3 Months Ended | | | | | | |
Mar. 31, 2015 | 31-May-11 | Sep. 30, 2010 | Dec. 31, 2008 | Aug. 31, 2008 | 31-May-08 | Dec. 31, 2007 |
Mcfe | Mcfe | Mcfe | Mcfe | Mcfe | Mcfe | Mcfe |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Energy) | 1,220,000,000,000 | | | | | | |
Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Energy) | 314,200,000,000 | | | | | | |
Oil [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 5,200,000 | | | | | | |
Oil [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 2,100,000 | | | | | | |
Natural Gas [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 1,105,000,000,000 | | | | | | |
Natural Gas [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 264,200,000,000 | | | | | | |
Natural Gas Liquids [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 14,000,000 | | | | | | |
Natural Gas Liquids [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 6,200,000 | | | | | | |
VPP 10 Anadarko Basin Granite Wash [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Term remaining (in months) | 83 months | | | | | | |
Proved Developed Reserves (Energy) | 69,600,000,000 | | | | | | |
VPP 10 Anadarko Basin Granite Wash [Member] | Oil [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 1,200,000 | | | | | | |
VPP 10 Anadarko Basin Granite Wash [Member] | Natural Gas [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 35,800,000,000 | | | | | | |
VPP 10 Anadarko Basin Granite Wash [Member] | Natural Gas Liquids [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 4,400,000 | | | | | | |
VPP 9 Mid-Continent [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Energy) | | 177,000,000,000 | | | | | |
VPP 9 Mid-Continent [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Term remaining (in months) | 71 months | | | | | | |
Proved Developed Reserves (Energy) | 85,300,000,000 | | | | | | |
VPP 9 Mid-Continent [Member] | Oil [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | | 1,700,000 | | | | | |
VPP 9 Mid-Continent [Member] | Oil [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 800,000 | | | | | | |
VPP 9 Mid-Continent [Member] | Natural Gas [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | | 138,000,000,000 | | | | | |
VPP 9 Mid-Continent [Member] | Natural Gas [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 69,500,000,000 | | | | | | |
VPP 9 Mid-Continent [Member] | Natural Gas Liquids [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | | 4,800,000 | | | | | |
VPP 9 Mid-Continent [Member] | Natural Gas Liquids [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 1,800,000 | | | | | | |
VPP 8 Barnett Shale [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Energy) | | | 390,000,000,000 | | | | |
VPP 8 Barnett Shale [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Term remaining (in months) | 5 months | | | | | | |
Proved Developed Reserves (Energy) | 22,500,000,000 | | | | | | |
VPP 8 Barnett Shale [Member] | Oil [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | | | 0 | | | | |
VPP 8 Barnett Shale [Member] | Oil [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 0 | | | | | | |
VPP 8 Barnett Shale [Member] | Natural Gas [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | | | 390,000,000,000 | | | | |
VPP 8 Barnett Shale [Member] | Natural Gas [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 22,500,000,000 | | | | | | |
VPP 8 Barnett Shale [Member] | Natural Gas Liquids [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | | | 0 | | | | |
VPP 8 Barnett Shale [Member] | Natural Gas Liquids [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 0 | | | | | | |
VPP 4 Anadarko and Arkoma Basins [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Energy) | | | | 98,000,000,000 | | | |
VPP 4 Anadarko and Arkoma Basins [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Term remaining (in months) | 21 months | | | | | | |
Proved Developed Reserves (Energy) | 13,700,000,000 | | | | | | |
VPP 4 Anadarko and Arkoma Basins [Member] | Oil [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | | | | 500,000 | | | |
VPP 4 Anadarko and Arkoma Basins [Member] | Oil [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 100,000 | | | | | | |
VPP 4 Anadarko and Arkoma Basins [Member] | Natural Gas [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | | | | 95,000,000,000 | | | |
VPP 4 Anadarko and Arkoma Basins [Member] | Natural Gas [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 13,300,000,000 | | | | | | |
VPP 4 Anadarko and Arkoma Basins [Member] | Natural Gas Liquids [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | | | | 0 | | | |
VPP 4 Anadarko and Arkoma Basins [Member] | Natural Gas Liquids [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 0 | | | | | | |
VPP 3 Anadarko Basin [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Energy) | | | | | 93,000,000,000 | | |
VPP 3 Anadarko Basin [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Term remaining (in months) | 52 months | | | | | | |
Proved Developed Reserves (Energy) | 22,200,000,000 | | | | | | |
VPP 3 Anadarko Basin [Member] | Oil [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | | | | | 0 | | |
VPP 3 Anadarko Basin [Member] | Oil [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 0 | | | | | | |
VPP 3 Anadarko Basin [Member] | Natural Gas [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | | | | | 93,000,000,000 | | |
VPP 3 Anadarko Basin [Member] | Natural Gas [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 22,200,000,000 | | | | | | |
VPP 3 Anadarko Basin [Member] | Natural Gas Liquids [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | | | | | 0 | | |
VPP 3 Anadarko Basin [Member] | Natural Gas Liquids [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 0 | | | | | | |
VPP 2 Texas, Oklahoma and Kansas [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Energy) | | | | | | 94,000,000,000 | |
VPP 2 Texas, Oklahoma and Kansas [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Term remaining (in months) | 49 months | | | | | | |
Proved Developed Reserves (Energy) | 12,800,000,000 | | | | | | |
VPP 2 Texas, Oklahoma and Kansas [Member] | Oil [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | | | | | | 0 | |
VPP 2 Texas, Oklahoma and Kansas [Member] | Oil [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 0 | | | | | | |
VPP 2 Texas, Oklahoma and Kansas [Member] | Natural Gas [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | | | | | | 94,000,000,000 | |
VPP 2 Texas, Oklahoma and Kansas [Member] | Natural Gas [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 12,800,000,000 | | | | | | |
VPP 2 Texas, Oklahoma and Kansas [Member] | Natural Gas Liquids [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | | | | | | 0 | |
VPP 2 Texas, Oklahoma and Kansas [Member] | Natural Gas Liquids [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 0 | | | | | | |
VPP 1 Kentucky and West Virginia [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Energy) | | | | | | | 208,000,000,000 |
VPP 1 Kentucky and West Virginia [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Term remaining (in months) | 93 months | | | | | | |
Proved Developed Reserves (Energy) | 88,100,000,000 | | | | | | |
VPP 1 Kentucky and West Virginia [Member] | Oil [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | | | | | | | 0 |
VPP 1 Kentucky and West Virginia [Member] | Oil [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 0 | | | | | | |
VPP 1 Kentucky and West Virginia [Member] | Natural Gas [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | | | | | | | 208,000,000,000 |
VPP 1 Kentucky and West Virginia [Member] | Natural Gas [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 88,100,000,000 | | | | | | |
VPP 1 Kentucky and West Virginia [Member] | Natural Gas Liquids [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | | | | | | | 0 |
VPP 1 Kentucky and West Virginia [Member] | Natural Gas Liquids [Member] | Reserve Volume Remaining [Member] | | | | | | | |
Oil and Gas Delivery Commitments and Contracts [Line Items] | | | | | | | |
Proved Developed Reserves (Volume) | 0 | | | | | | |