2.2.0.7 false Joint Venture Acquisition Obligation (Details) (USD $) 0610 - Disclosure - Joint Venture Acquisition Obligation (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 $ 3 Joint Venture Acquisition Obligation (Textuals) [Abstract] 1 cop_JointVentureAcquisitionObligationTextualsAbstract cop false na duration Joint Venture Acquisition Obligation Textuals. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false xbrli:stringItemType string Joint Venture Acquisition Obligation Textuals. false 4 Initial Acquisition Obligation to Joint Venture 2 cop_InitialAcquisitionObligationToJointVenture cop false credit duration Obligation to Joint Venture over a 10-year period, beginning in 2007. false false false false false false false false false false false verboselabel false 1 true true false false 7500000000 7500000000 false false false xbrli:monetaryItemType monetary Obligation to Joint Venture over a 10-year period, beginning in 2007. No authoritative reference available. false 5 Quarterly Principal and Interest Payment for Joint Venture Acquisition Obligation 2 cop_JointVentureAcquisitionOblilgationQuarterlyPayment cop false debit duration Amount of the required quarterly payments including both interest and principal payments for Joint Venture Acquisition... false false false false false false false false false false false verboselabel false 1 false true false false 237000000 237000000 false false false xbrli:monetaryItemType monetary Amount of the required quarterly payments including both interest and principal payments for Joint Venture Acquisition Obligation. No authoritative reference available. false 6 Short term portion of principal obligation amount 2 cop_ShortTermPortionOfPrincipalObligationAmount cop false credit instant Short term portion of principal obligation amount. false false false false false false false false false false false verboselabel false 1 false true false false 677000000 677000000 false false false xbrli:monetaryItemType monetary Short term portion of principal obligation amount. No authoritative reference available. false 7 Principal payments for Joint Venture Obligation 2 cop_JointVentureAcquisitionObligationPrincipalPayment cop false debit duration Amount of the required quarterly payments applied to principal. false false false false false false false false false false false verboselabel false 1 true true false false 325000000 325000000 false false false xbrli:monetaryItemType monetary Amount of the required quarterly payments applied to principal. No authoritative reference available. false 8 Fixed Annual Interest Rate 2 cop_FixedAnnualInterestRateOnJointVentureAcquisitionObligation cop false na duration Fixed annual interest rate used to accrue interest on unpaid principal balance of Joint Venture Acquisition Obligation false false false false false false false false false false false verboselabel false 1 false true false false 0.053 0.053 false false false us-types:percentItemType pure Fixed annual interest rate used to accrue interest on unpaid principal balance of Joint Venture Acquisition Obligation No authoritative reference available. false 9 Percent of Quarterly interest payment as capital contribution 2 cop_PercentOfQuarterlyInterestPaymentAsCapitalContribution cop false na duration Percent of the quarterly interest payment that is reflected as a capital contribution. false false false false false false false false false false false verboselabel false 1 false true false false 0.5 0.5 false false false us-types:percentItemType pure Percent of the quarterly interest payment that is reflected as a capital contribution. No authoritative reference available. false 1 7 false NoRounding UnKnown UnKnown false true