2.4.0.82403402 - Disclosure - Acquisitions and Divestitures Purchase Price Allocation (Details)truefalseShare data in Millions, except Per Share data, unless otherwise specifiedfalse1false falsefalseD2013Q3Sep1-Oct30http://www.sec.gov/CIK0000077159duration2013-09-01T00:00:002013-10-30T00:00:002false USDfalsefalse$D2013Q2http://www.sec.gov/CIK0000077159duration2013-04-01T00:00:002013-06-30T00:00:00sharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDfalsefalse$D2013Q2YTDApr24http://www.sec.gov/CIK0000077159duration2013-01-01T00:00:002013-04-24T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170usdPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$4false USDfalsefalse$D2013Q2YTDhttp://www.sec.gov/CIK0000077159duration2013-01-01T00:00:002013-06-30T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$5false USDfalsefalse$D2012Q2YTDhttp://www.sec.gov/CIK0000077159duration2012-01-01T00:00:002012-06-30T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 1pva_AcquisitionsAndDivestituresAbstractpva_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Acquisitions and Divestitures [Abstract]2false 2pva_BusinessAcquisitionValuationNetAssetsofAcquiredEntitypva_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse401000000401000000USD$falsetruefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe valuation assigned to the net assets of the acquired entity associated with the acquisition of a business, as of the effective date, before any purchase price adjustments and exercise of preferential rights related to the acquisition by certain joint interest partnersNo definition available.false2Business Acquisition, Valuation, Net Assets of Acquired Entity3false 2pva_BusinessAcquisitionTotalConsiderationTransferredNetofProceedsFromInvestingPartnerspva_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse380000000380000000falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe total consideration transferred to consummate the acquisition of a business, net of the cash proceeds received from certain investing partners to increase their ownership stakes in a joint ventureNo definition available.false2Business Acquisition, Total Consideration Transferred, Net of Proceeds From Investing Partners4false 2pva_BusinessAcquisitionPurchasePriceAdjustmentsEffectiveDatetoDateofAcquisitionpva_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse1900000019000000falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryInitial purchase price adjustments associated with the acquisition of a business related to the period from the Effective Date to the Date of AcquisitionNo definition available.false2Business Acquisition, Purchase Price Adjustments, Effective Date to Date of Acquisition5false 2us-gaap_StockIssuedDuringPeriodSharesAcquisitionsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse1000000010falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:sharesItemTypesharesNumber of shares of stock issued during the period pursuant to acquisitions.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Business Acquisition, Purchase Price Allocation, Current Liabilities, Accounts Payable15false 2us-gaap_BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentLiabilitiesus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse-1500000-1500000falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of acquisition cost of a business combination allocated to other noncurrent liabilities not separately disclosed.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Business Acquisition, Purchase Price Allocation, Current Liabilities, Accrued Liabilities16false 2us-gaap_BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumedus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse-56553000-56553000falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe amount of acquisition cost of a business combination allocated to liabilities assumed.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 98-1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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