2.2.0.7 false Contingencies and Commitments (Details) (USD $) 0613 - Disclosure - Contingencies and Commitments (Details) 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 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ 3 Contingencies and Commitments (Textuals) [Abstract] 1 cop_ContingenciesAndCommitmentsTextualsAbstract cop false na duration Contingencies And Commitments 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 Contingencies And Commitments Textuals. false 4 Total environmental accrual 2 us-gaap_AccrualForEnvironmentalLossContingenciesNet 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 987000000 987 false false false xbrli:monetaryItemType monetary Present value of the estimated aggregate accrual for environmental loss contingencies as of the balance sheet date (if the accrual qualifies for discounting). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y -Paragraph Question 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 96-1 -Paragraph 161, 132 false 5 Expected years to incur the majority of expenditures 2 cop_ExpectedYearsToIncurMajorityOfExpenditures cop false na instant Expected years to incur the majority of expenditures. false false false false false false false false false false false verboselabel false 1 false true false false 30 30 false false false xbrli:integerItemType integer Expected years to incur the majority of expenditures. No authoritative reference available. false 6 Unused letters of credit 2 cop_UnusedLettersOfCredit cop false credit instant Unused letters of credit. false false false false false false false false false false false verboselabel false 1 false true false false 1684000000 1684 false false false xbrli:monetaryItemType monetary Unused letters of credit. No authoritative reference available. false 7 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 40 false false false xbrli:monetaryItemType monetary Letters of credit issued under revolving credit facilities. No authoritative reference available. false 8 Payments under Long-Term Throughput Agreements and Take-or-Pay Agreements, Due within One Year 2 cop_PaymentsUnderLongTermThroughputAgreementsAndTakeOrPayAgreementsDueWithinOneYear cop false debit instant Payments Under Long Term Throughput Agreements And Take Or Pay Agreements Due within One Year. false false false false false false false false false false false verboselabel false 1 false true false false 25000000 25 false false false xbrli:monetaryItemType monetary Payments Under Long Term Throughput Agreements And Take Or Pay Agreements Due within One Year. No authoritative reference available. false 9 Payments under Long-Term Throughput Agreements and Take-or-Pay Agreements, Due in Second Year 2 cop_PaymentsUnderLongTermThroughputAgreementsAndTakeOrPayAgreementsDueInSecondYear cop false debit instant Payments Under Long Term Throughput Agreements And Take Or Pay Agreements Due In Second Year. false false false false false false false false false false false verboselabel false 1 false true false false 233000000 233 false false false xbrli:monetaryItemType monetary Payments Under Long Term Throughput Agreements And Take Or Pay Agreements Due In Second Year. No authoritative reference available. false 10 Payments under Long-Term Throughput Agreements and Take-or-Pay Agreements, Due in Third Year 2 cop_PaymentsUnderLongTermThroughputAgreementsAndTakeOrPayAgreementsDueInThirdYear cop false debit instant Payments Under Long Term Throughput Agreements And Take Or Pay Agreements Due In Third Year. false false false false false false false false false false false verboselabel false 1 false true false false 277000000 277 false false false xbrli:monetaryItemType monetary Payments Under Long Term Throughput Agreements And Take Or Pay Agreements Due In Third Year. No authoritative reference available. false 11 Payments under Long-Term Throughput Agreements and Take-or-Pay Agreements, Due in Fourth Year 2 cop_PaymentsUnderLongTermThroughputAgreementsAndTakeOrPayAgreementsDueInFourthYear cop false debit instant Payments Under Long Term Throughput Agreements And Take Or Pay Agreements Due In Fourth Year. false false false false false false false false false false false verboselabel false 1 false true false false 276000000 276 false false false xbrli:monetaryItemType monetary Payments Under Long Term Throughput Agreements And Take Or Pay Agreements Due In Fourth Year. No authoritative reference available. false 12 Payments under Long-Term Throughput Agreements and Take-or-Pay Agreements, Due in Fifth Year 2 cop_PaymentsUnderLongTermThroughputAgreementsAndTakeOrPayAgreementsDueInFifthYear cop false debit instant Payments Under Long Term Throughput Agreements And Take Or Pay Agreements Due In Fifth Year. false false false false false false false false false false false verboselabel false 1 false true false false 276000000 276 false false false xbrli:monetaryItemType monetary Payments Under Long Term Throughput Agreements And Take Or Pay Agreements Due In Fifth Year. No authoritative reference available. false 13 Payments under Long-Term Throughput Agreements and Take-or-Pay Agreements, Due after Fifth Year 2 cop_PaymentsUnderLongTermThroughputAgreementsAndTakeOrPayAgreementsDueAfterFifthYear cop false debit instant Payments Under Long Term Throughput Agreements And Take Or Pay Agreements Due After Fifth Year. false false false false false false false false false false false verboselabel false 1 true true false false 4423000000 4423 false false false xbrli:monetaryItemType monetary Payments Under Long Term Throughput Agreements And Take Or Pay Agreements Due After Fifth Year. No authoritative reference available. false 1 11 false Millions UnKnown UnKnown false true