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 $ false 2 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 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 3 false false Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 false 4 USD true false false false cop_LukoilMember us-gaap_StatementBusinessSegmentsAxis xbrldi http://xbrl.org/2006/xbrldi cop_LukoilMember us-gaap_StatementBusinessSegmentsAxis explicitMember Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 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 $ false 5 USD true false false false cop_LukoilMember us-gaap_StatementBusinessSegmentsAxis xbrldi http://xbrl.org/2006/xbrldi cop_LukoilMember us-gaap_StatementBusinessSegmentsAxis explicitMember 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 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 6 USD true false false false cop_LukoilMember us-gaap_StatementBusinessSegmentsAxis xbrldi http://xbrl.org/2006/xbrldi cop_LukoilMember us-gaap_StatementBusinessSegmentsAxis explicitMember Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 7 USD true false false false cop_AffiliatedCompanyOneMember 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 8 USD true false false false cop_AffiliatedCompanyTwoMember us-gaap_RelatedPartyTransactionsByRelatedPartyAxis xbrldi http://xbrl.org/2006/xbrldi cop_AffiliatedCompanyTwoMember us-gaap_RelatedPartyTransactionsByRelatedPartyAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 9 USD true false false false cop_AffiliatedCompanyThreeMember 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 10 USD true false false false cop_AffiliatedCompanyFourMember 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 $ 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 false 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 xbrli:stringItemType string Investments Loans And Long Term Receivables Textuals. false 6 Ownership percentage in equity method 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 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 false false false 4 false true false false 0.1921 0.1921 true false false 5 false true false false 0.1921 0.1921 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 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 7 Common stock shares authorized 4 us-gaap_CommonStockSharesAuthorized us-gaap true na instant No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false true false false 2500000000 2500000000 false false false 3 false false false false 0 0 false false false 4 false true false false 851000000 851000000 true false false 5 false true false false 851000000 851000000 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 xbrli:sharesItemType shares The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 false 8 Common stock shares issued 4 us-gaap_CommonStockSharesIssued us-gaap true na instant No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false true false false 1736403629 1736403629 false false false 3 false false false false 0 0 false false false 4 false true false false 851000000 851000000 true false false 5 false true false false 851000000 851000000 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 xbrli:sharesItemType shares Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 false 9 Average ownership interest in first quarter 2010 4 cop_AverageOwnershipInterestInFirstQuarter2010 cop false na instant Average ownership interest in first 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 false false false 4 false true false false 0.2009 0.2009 true false false 5 false true false false 0.2009 0.2009 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 xbrli:pureItemType pure Average ownership interest in first quarter 2010. No authoritative reference available. false 10 Book value of equity method investment 4 us-gaap_EquityMethodInvestments 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 false false false 0 0 false false false 4 true true false false 6695000000 6695000000 true false false 5 true true false false 6695000000 6695000000 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 xbrli:monetaryItemType monetary This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment losses recognized. No authoritative reference available. false 11 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 false 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 163367629 163367629 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 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 12 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 false false false 4 false true false false 6700000 6700000 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 xbrli:sharesItemType shares Equity Method Investment Number Of Shares Sold. No authoritative reference available. false 13 Cash proceeds from sale 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 false false false 4 false true false false 391000000 391000000 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 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 14 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 false false false 4 false true false false 99000000 99000000 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 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 15 Difference between estimated value and book value of equity method investment 4 us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity 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 false false false 0 0 false false false 4 false true false false 4234000000 4234000000 true false false 5 false true false false 4234000000 4234000000 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 xbrli:monetaryItemType monetary The item represents the difference, if any, between the amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and the amount of underlying equity in net assets the reporting Entity has in the investee. A difference can arise between the carrying value of the equity method investment and the value of the Entity's amount of underlying equity in net assets of the investee, for example, from appreciation of certain assets which is not recognized in earnings, but is recognized in other comprehensive income (a separate component of shareholders' equity) by the investee. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a(3) false 16 Total period of amortization of basis difference, in years 4 cop_TotalPeriodOfAmortizationOfBasisDifferenceInYears cop false na duration Total period of amortization of basis difference, in years. 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 false false false 4 false false false false 0 0 true false false 5 false true false false 22 22 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 xbrli:integerItemType integer Total period of amortization of basis difference, in years. No authoritative reference available. false 17 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 false false false 4 true true false false 51.9 51.9 true false false 5 true true false false 51.9 51.9 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 us-types:perShareItemType decimal Closing Price Per Share On The London Stock Exchange. No authoritative reference available. false 18 Total market value of equity method investment 4 us-gaap_EquityMethodInvestmentQuotedMarketValue 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 false false false 0 0 false false false 4 false true false false 8479000000 8479000000 true false false 5 false true false false 8479000000 8479000000 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 xbrli:monetaryItemType monetary This item represents the aggregate value of each identified investment accounted for under the equity method of accounting based on the quoted market price for those investments in common stock for which a quoted market price is available. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph b false 19 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 false 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 64638729 64638729 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 xbrli:integerItemType integer Number of shares to be sold under agreement. No authoritative reference available. false 20 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 false 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 53.25 53.25 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 us-types:perShareItemType decimal Price per share for selling shares under agreement. No authoritative reference available. false 21 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 false 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 3440000000 3440000000 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 xbrli:monetaryItemType monetary Sales consideration of investments under agreement. No authoritative reference available. false 22 Approximate ownership level at which equity method accounting would likely be discontinued 4 cop_ApproximateOwnershipLevelAtWhichEquityMethodAccountingWouldLikelyBeDiscontinued cop false na instant Approximate ownership level at which equity method accounting would likely be discontinued. 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 true false false 0.1 0.1 false false false 3 false false false false 0 0 false 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 xbrli:pureItemType pure Approximate ownership level at which equity method accounting would likely be discontinued. No authoritative reference available. false 23 Price per share for selling remaining shares under 60 day option granted under the agreement 4 cop_PricePerShareForSellingRemainingSharesUnder60DayOptionGrantedUnderAgreement cop false na instant Price Per Share For Selling Remaining Shares Under 60 Day Option Granted Under Agreement. false false false false false false false false false false false verboselabel false 1 false true false false 56 56 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false 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 xbrli:decimalItemType decimal Price Per Share For Selling Remaining Shares Under 60 Day Option Granted Under Agreement. No authoritative reference available. false 24 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 false false false 0 0 false 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 676000000 676000000 true false false 8 false true false false 246000000 246000000 true false false 9 false true false false 1064000000 1064000000 true false false 10 false true false false 550000000 550000000 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 25 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 false 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 93000000 93000000 true false false 10 false false false false 0 0 true false false xbrli:monetaryItemType monetary Accrued interest on financing. No authoritative reference available. false 26 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 false false false 0 0 false false false 2 true true false false 304000000 304000000 false false false 3 false false false false 0 0 false 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 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 27 Additional equity method ownership interest acquired in Merey Sweeny 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 true false false 0.5 0.5 false 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 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 28 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 true false false 70000 70000 false false false 3 false false false false 0 0 false 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 xbrli:integerItemType integer Capacity of Mery Sweeny Limited Partnership facility, barrels-per-day. No authoritative reference available. false 10 24 false NoRounding NoRounding UnKnown false true