2.2.0.7 true Debt (Details) (USD $) 0609 - Disclosure - Debt (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 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 $ 4 Debt (Textuals) [Abstract] 2 cop_DebtTextualsAbstract cop false na duration Debt 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 xbrli:stringItemType string Debt Textuals. false 5 Total revolving credit facilities 2 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 true true false false 7850000000 7850000000 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. 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Commercial Paper Program 2 cop_CommercialPaperProgramInternationalProject cop false credit instant Commercial Paper Program, International Project. false false false false false false false false false false false verboselabel false 1 false true false false 1500000000 1500000000 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary Commercial Paper Program, International Project. No authoritative reference available. false 8 Letters of credit issued under revolving credit facilities 2 cop_LettersOfCreditIssuedUnderRevolvingCreditFacilities cop false credit instant Letters of credit issued under revolving credit facilities. false false false false false false false false false false false verboselabel false 1 false true false false 40000000 40000000 false false false 2 false true false false 40000000 40000000 false false false xbrli:monetaryItemType monetary Letters of credit issued under revolving credit facilities. No authoritative reference available. false 9 ConocoPhillips commercial paper outstanding 2 us-gaap_CommercialPaper us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1159000000 1159000000 false false false 2 false true false false 1300000000 1300000000 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. 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No authoritative reference available. false 11 Credit facilities remaining after commercial paper outstanding and issuance of letters of credit 2 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 6700000000 6700000000 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 false 14 8.75% [Member] 0 na true na na No definition available. false true false false false false false false false false false http://conocophillips.com/role/debtdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false false 3 USD true false false false 8.75% [Member] us-gaap_DebtInstrumentAxis xbrldi http://xbrl.org/2006/xbrldi cop_BondSevenMember us-gaap_DebtInstrumentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 $ na No definition available. No authoritative reference available. false 17 Debt (Textuals) [Abstract] 2 cop_DebtTextualsAbstract cop false na duration Debt 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 xbrli:stringItemType string Debt Textuals. false 25 Debt Repayment 2 us-gaap_DebtInstrumentFaceAmount us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1264000000 1264000000 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. 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No authoritative reference available. false 30 Debt (Textuals) [Abstract] 2 cop_DebtTextualsAbstract cop false na duration Debt 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 xbrli:stringItemType string Debt Textuals. false 38 Debt Repayment 2 us-gaap_DebtInstrumentFaceAmount us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 150000000 150000000 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 false 39 Interest rate on bond 2 us-gaap_DebtInstrumentInterestRateStatedPercentage us-gaap true na instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0.09875 0.09875 false false false 2 false false false false 0 0 false false false us-types:percentItemType pure Interest rate stated in the contractual debt agreement. 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No authoritative reference available. false 43 Debt (Textuals) [Abstract] 2 cop_DebtTextualsAbstract cop false na duration Debt 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 xbrli:stringItemType string Debt Textuals. false 51 Debt Repayment 2 us-gaap_DebtInstrumentFaceAmount us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 350000000 350000000 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 false 52 Interest rate on bond 2 us-gaap_DebtInstrumentInterestRateStatedPercentage us-gaap true na instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0.053 0.053 false false false 2 false false false false 0 0 false false false us-types:percentItemType pure Interest rate stated in the contractual debt agreement. 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No authoritative reference available. false 56 Debt (Textuals) [Abstract] 2 cop_DebtTextualsAbstract cop false na duration Debt 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 xbrli:stringItemType string Debt Textuals. false 64 Debt Repayment 2 us-gaap_DebtInstrumentFaceAmount us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1750000000 1750000000 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 false 65 Interest rate on bond 2 us-gaap_DebtInstrumentInterestRateStatedPercentage us-gaap true na instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0.0635 0.0635 false false false 2 false false false false 0 0 false false false us-types:percentItemType pure Interest rate stated in the contractual debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 false 66 6.4% Bonds [Member] 0 na true na na No definition available. false true false false false false false false false false false http://conocophillips.com/role/debtdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false false 7 USD true false false false 6.4% Bonds [Member] us-gaap_DebtInstrumentAxis xbrldi http://xbrl.org/2006/xbrldi cop_BondFourMember us-gaap_DebtInstrumentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 $ na No definition available. No authoritative reference available. false 69 Debt (Textuals) [Abstract] 2 cop_DebtTextualsAbstract cop false na duration Debt 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 xbrli:stringItemType string Debt Textuals. false 77 Debt Repayment 2 us-gaap_DebtInstrumentFaceAmount us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 178000000 178000000 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. 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No authoritative reference available. false 82 Debt (Textuals) [Abstract] 2 cop_DebtTextualsAbstract cop false na duration Debt 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 xbrli:stringItemType string Debt Textuals. false 90 Debt Repayment 2 us-gaap_DebtInstrumentFaceAmount us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 400000000 400000000 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. 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No authoritative reference available. false 2 38 false NoRounding UnKnown UnKnown false true