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Oil and Natural Gas Property Transactions - VPP Transactions Table (Details) - VPP 9 Mid-Continent [Member] MBbls in Millions, $ in Millions, Mcfe in Billions, Mcf in Billions | May 31, 2011 USD ($) Mcfe MBbls Mcf
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VPP Transactions [Line Items] |
Cash Proceeds from Volumetric Production Payment (VPP) | $ | $ 853
Proved Developed Reserves (Energy) | Mcfe | 177
Oil [Member] |
VPP Transactions [Line Items] |
Proved Developed Reserves (Volume) | 1.7
Natural Gas [Member] |
VPP Transactions [Line Items] |
Proved Developed Reserves (Volume) | Mcf | 138
NGL [Member] |
VPP Transactions [Line Items] |
Proved Developed Reserves (Volume) | 4.8

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- Definition [Line Items] for VPP Transactions [Table] + References No definition available. + Details
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- Definition Energy measure of interests in proved developed reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas. + References No definition available. + Details
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- Definition Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61884-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61797-109447 + Details
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