2.2.0.7 true Investments, Loans and Long-Term Receivables (Details) (USD $) 0606 - Disclosure - Investments, Loans and Long-Term Receivables (Details) true false false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 2 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 3 USD true false false false Freeport LNG Development, L.P. [Member] us-gaap_RelatedPartyTransactionsByRelatedPartyAxis xbrldi http://xbrl.org/2006/xbrldi cop_AffiliatedCompanyOneMember us-gaap_RelatedPartyTransactionsByRelatedPartyAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 4 USD true false false false Qatargas 3 [Member] us-gaap_RelatedPartyTransactionsByRelatedPartyAxis xbrldi http://xbrl.org/2006/xbrldi cop_AffiliatedCompanyThreeMember us-gaap_RelatedPartyTransactionsByRelatedPartyAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 5 USD true false false false WRB Refining LLC [Member] us-gaap_RelatedPartyTransactionsByRelatedPartyAxis xbrldi http://xbrl.org/2006/xbrldi cop_AffiliatedCompanyFourMember us-gaap_RelatedPartyTransactionsByRelatedPartyAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 6 USD true false false false LUKOIL Investment [Member] us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis xbrldi http://xbrl.org/2006/xbrldi cop_LukoilMember us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis explicitMember Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ false 7 USD true false false false LUKOIL Investment [Member] us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis xbrldi http://xbrl.org/2006/xbrldi cop_LukoilMember us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis explicitMember Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 8 USD true false false false LUKOIL Investment [Member] us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis xbrldi http://xbrl.org/2006/xbrldi cop_LukoilMember us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis explicitMember Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 9 true false false false LUKOIL Investment [Member] us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis xbrldi http://xbrl.org/2006/xbrldi cop_LukoilMember us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 false 10 true false false false Merey Sweeny, L.P. [Member] us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis xbrldi http://xbrl.org/2006/xbrldi cop_MereySweenyLpMember us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 false 11 true false false false Merey Sweeny, L.P. [Member] us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis xbrldi http://xbrl.org/2006/xbrldi cop_MereySweenyLpMember us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 5 Investments, Loans and Long-Term Receivables (Textuals) [Abstract] 3 cop_InvestmentsLoansAndLongTermReceivablesTextualsAbstract cop false na duration Investments Loans And Long Term Receivables Textuals. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false xbrli:stringItemType string Investments Loans And Long Term Receivables Textuals. false 6 Average ownership interest in second quarter 2010 4 cop_AverageOwnershipInterest cop false na instant Average Ownership Interest In Second Quarter 2010. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false true false false 0.1946 0.1946 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false xbrli:pureItemType pure Average Ownership Interest In Second Quarter 2010. No authoritative reference available. false 7 Shares owned 4 us-gaap_InvestmentOwnedBalanceShares us-gaap true na instant No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false true false false 163367629 163367629 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false xbrli:sharesItemType shares Balance held at close of period in number of shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph Column B -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column B -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph Column B -Article 12 false 8 Number of shares of equity method investment sold 4 cop_EquityMethodInvestmentNumberOfSharesSold cop false na duration Equity Method Investment Number Of Shares Sold. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false true false false 113000000 113000000 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false xbrli:sharesItemType shares Equity Method Investment Number Of Shares Sold. No authoritative reference available. false 9 Value of equity method investment shares 4 us-gaap_EquityMethodInvestmentNetSalesProceeds us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 true true false false 6161000000 6161000000 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false xbrli:monetaryItemType monetary This item represents the amount of net sales proceeds received on disposal of an equity method investment. No authoritative reference available. false 10 Gain (loss) on disposal of equity method investment 4 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false true false false 1219000000 1219000000 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false xbrli:monetaryItemType monetary This item represents the amount of gain or loss arising from the disposal of an equity method investment. No authoritative reference available. false 11 Closing price of shares on the London Stock Exchange, per share 4 cop_ClosingPricePerShareOnLondonStockExchange cop false na instant Closing Price Per Share On The London Stock Exchange. false false false false false false false false false false false verboselabel true 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 true true false false 56.8 56.8 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false us-types:perShareItemType decimal Closing Price Per Share On The London Stock Exchange. No authoritative reference available. false 12 Number of shares to be sold under stock purchase and option agreement with wholly owned subsidiary of LUKOIL 4 cop_NumberOfSharesToBeSoldUnderAgreement cop false na instant Number of shares to be sold under agreement. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false true false false 42500000 42500000 true false false 8 false true false false 64638729 64638729 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false xbrli:sharesItemType shares Number of shares to be sold under agreement. No authoritative reference available. false 13 Price per share for selling shares under stock purchase and option agreement with wholly owned subsidiary of LUKOIL 4 cop_PricePerShareForSellingSharesUnderAgreement cop false na instant Price per share for selling shares under agreement. false false false false false false false false false false false verboselabel true 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 true true false false 56 56 true false false 8 true true false false 53.25 53.25 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false us-types:perShareItemType decimal Price per share for selling shares under agreement. No authoritative reference available. false 14 Sales consideration of investments under stock purchase and option agreement with wholly owned subsidiary of LUKOIL 4 cop_SalesConsiderationOfInvestmentsUnderAgreement cop false credit instant Sales consideration of investments under agreement. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false true false false 2380000000 2380000000 true false false 8 false true false false 3440000000 3440000000 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false xbrli:monetaryItemType monetary Sales consideration of investments under agreement. No authoritative reference available. false 15 Reserves, Share of Equity Method Investee's Net Proved Oil and Gas Reserves 4 us-gaap_ReservesShareOfEquityMethodInvesteesNetProvedOilAndGasReserves us-gaap true na instant No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false true false false 1967000000 1967000000 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false xbrli:decimalItemType decimal The proportional interest of net proved oil reserve quantities of equity investees Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59I -Subparagraph c false 16 Number of production barrels per day 4 cop_NumberOfProductionBarrelsPerDay cop false na duration Number of production barrels per day. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false true false false 437000 437000 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false xbrli:integerItemType integer Number of production barrels per day. No authoritative reference available. false 17 Carrying value of share investment in LUKOIL 4 us-gaap_AvailableForSaleSecuritiesEquitySecuritiesCurrent us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 2856000000 2856000000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false true false false 2856000000 2856000000 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false xbrli:monetaryItemType monetary This item represents equity securities categorized neither as held-to-maturity nor trading which are intended to be sold within one year from the balance sheet date or the normal operating cycle, whichever is longer. Equity securities represent ownership interests or the right to acquire ownership interests in corporations and other legal entities which ownership interest is represented by shares of common or preferred stock (which is not mandatorily redeemable or redeemable at the option of the holder), convertible securities, stock rights, or stock warrants. Such securities are reported at fair value; unrealized gains and losses related to Available-for-sale securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 3 -Section A -Paragraph 4, 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 17 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 3 -Subparagraph c Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 false 18 Gross unrealized gain on investment 4 us-gaap_UnrealizedGainLossOnInvestments us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 663000000 663000000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false xbrli:monetaryItemType monetary The aggregate increase (decrease) in the market value of unsold investments whose gains (losses) are included in earnings. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 19 Fair value of investments remeasured on a recurring basis, valued at Level 1 of the fair value hierarchy 4 us-gaap_FairValueMeasuredOnRecurringBasisInvestments us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 315000000 315000000 false false false 2 false true false false 338000000 338000000 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 20 Additional equity method ownership interest acquired in Limited Partnership 4 cop_AdditionalEquityMethodOwnershipInterestAcquiredInMereySweenyLimitedPartnership cop false na instant Additional equity method ownership interest acquired in Merey Sweeny Limited Partnership from Petroleos De Venezuela S.A.... false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false true false false 0.5 0.5 true false false us-types:percentItemType pure Additional equity method ownership interest acquired in Merey Sweeny Limited Partnership from Petroleos De Venezuela S.A. (PDVSA). No authoritative reference available. false 21 Capacity of Merey Sweeny Limited Partnership facility, barrels-per-day 4 cop_CapacityOfMereySweenyLimitedPartnershipFacilityBarrelsPerDay cop false na instant Capacity of Mery Sweeny Limited Partnership facility, barrels-per-day. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false true false false 70000 70000 true false false 11 false false false false 0 0 true false false xbrli:integerItemType integer Capacity of Mery Sweeny Limited Partnership facility, barrels-per-day. No authoritative reference available. false 22 Ownership percentage in equity investment 4 us-gaap_EquityMethodInvestmentOwnershipPercentage us-gaap true na instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 0.059 0.059 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false true false false 0.059 0.059 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false true false false 0.5 0.5 true false false us-types:percentItemType pure The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) false 25 Loans to Related Parties [Abstract] 3 cop_LoansToRelatedPartiesAbstract cop false na duration Loans to Related Parties false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false xbrli:stringItemType string Loans to Related Parties false 26 Loan/project financing to affiliated company 4 us-gaap_DueFromRelatedParties us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 663000000 663000000 true false false 4 false true false false 1096000000 1096000000 true false false 5 false true false false 551000000 551000000 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false xbrli:monetaryItemType monetary For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 16, 17 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 57 -Paragraph 2 -Subparagraph d Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Article 7 false 27 Acccrued interest on financing 4 cop_AcccruedInterestOnFinancing cop false credit instant Accrued interest on financing. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 true false false 4 true true false false 94000000 94000000 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false xbrli:monetaryItemType monetary Accrued interest on financing. No authoritative reference available. false 11 21 false NoRounding NoRounding UnKnown false true