2.2.0.7 true Financial Instruments and Derivative Contracts (Details Textual) (USD $) 06145 - Disclosure - Financial Instruments and Derivative Contracts (Details Textual) true false In Millions 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 $ 5 Financial Instruments and Derivative Contracts (Textuals) [Abstract] 2 cop_FinancialInstrumentsAndDerivativeContractsTextualsAbstract cop false na duration Financial Instruments and Derivative Contracts Textuals Abstract. 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 Financial Instruments and Derivative Contracts Textuals Abstract. false 6 Aggregate fair value of all derivative instruments in a liability position 2 us-gaap_DerivativeNetLiabilityPositionAggregateFairValue 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 226000000 226 false false false 2 true true false false 381000000 381 false false false xbrli:monetaryItemType monetary The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain or loss on that instrument. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44D -Subparagraph b false 7 Additional collateral, either in the form of cash or letters of credit 2 us-gaap_AdditionalCollateralAggregateFairValue 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 226000000 226 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. 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These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. false 15 Amount converted by interest rate swap execution 2 cop_AmountConvertedByInterestRateSwapExecution cop false credit instant Amount converted by interest rate swap execution. false false false false false false false false false false false verboselabel false 1 true true false false 500000000 500 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary Amount converted by interest rate swap execution. 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