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Oil and Natural Gas Property Transactions - VPP Volumes Produced During Period Table (Details) Mcfe in Billions, Mcf in Billions | 3 Months Ended
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Mar. 31, 2017 Mcfe MBbls Mcf | Mar. 31, 2016 Mcfe MBbls Mcf
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserve, Production (Energy) | Mcfe |  | 15.3
Oil [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production |  | 115,500
Natural Gas [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production | Mcf |  | 12.8
NGL [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production |  | 312,000
VPP 10 Anadarko Basin Granite Wash [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserve, Production (Energy) | Mcfe |  | 3.5
VPP 10 Anadarko Basin Granite Wash [Member] | Oil [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production |  | 66,000
VPP 10 Anadarko Basin Granite Wash [Member] | Natural Gas [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production | Mcf |  | 1.8
VPP 10 Anadarko Basin Granite Wash [Member] | NGL [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production |  | 222,700
VPP 9 Mid-Continent [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserve, Production (Energy) | Mcfe | 3.8 | 4.1
VPP 9 Mid-Continent [Member] | Oil [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production | 35,900 | 39,400
VPP 9 Mid-Continent [Member] | Natural Gas [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production | Mcf | 3.1 | 3.4
VPP 9 Mid-Continent [Member] | NGL [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production | 82,800 | 89,300
VPP 4 Anadarko and Arkoma Basins [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserve, Production (Energy) | Mcfe |  | 2.0
VPP 4 Anadarko and Arkoma Basins [Member] | Oil [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production |  | 10,100
VPP 4 Anadarko and Arkoma Basins [Member] | Natural Gas [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production | Mcf |  | 1.9
VPP 4 Anadarko and Arkoma Basins [Member] | NGL [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production |  | 0
VPP 3 Anadarko Basin [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserve, Production (Energy) | Mcfe |  | 1.5
VPP 3 Anadarko Basin [Member] | Oil [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production |  | 0
VPP 3 Anadarko Basin [Member] | Natural Gas [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production | Mcf |  | 1.5
VPP 3 Anadarko Basin [Member] | NGL [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production |  | 0
VPP 2 Texas, Oklahoma and Kansas [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserve, Production (Energy) | Mcfe |  | 0.9
VPP 2 Texas, Oklahoma and Kansas [Member] | Oil [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production |  | 0
VPP 2 Texas, Oklahoma and Kansas [Member] | Natural Gas [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production | Mcf |  | 0.9
VPP 2 Texas, Oklahoma and Kansas [Member] | NGL [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production |  | 0
VPP 1 Kentucky and West Virginia [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserve, Production (Energy) | Mcfe |  | 3.3
VPP 1 Kentucky and West Virginia [Member] | Oil [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production |  | 0
VPP 1 Kentucky and West Virginia [Member] | Natural Gas [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production | Mcf |  | 3.3
VPP 1 Kentucky and West Virginia [Member] | NGL [Member] |  |
VPP Volumes Produced During Period [Line Items] |  |
Proved Developed and Undeveloped Reserves, Production |  | 0

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- Definition [Line Items] for VPP Volumes Produced During Period [Table] + References No definition available. + Details
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- Definition Energy measure of decrease in quantity of proved reserve of oil and gas resulting from production, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447 + Details
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- Definition Production of proved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447 + Details
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