2.2.0.7 true Assets Held for Sale (Details) ( Syncrude Canada Ltd [Member], USD $) 0605 - Disclosure - Assets Held for Sale (Details) true false false false 1 true false false false cop_ProportionallyConsolidatedJointVentureMember us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis xbrldi http://xbrl.org/2006/xbrldi cop_ProportionallyConsolidatedJointVentureMember us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 false 2 USD true false false false cop_ProportionallyConsolidatedJointVentureMember us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis xbrldi http://xbrl.org/2006/xbrldi cop_ProportionallyConsolidatedJointVentureMember us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 $ 5 Assets Held for Sale (Textuals) [Abstract] 3 cop_AssetsHeldForSaleTextualsAbstract cop false na duration Assets Held for Sale Textuals Abstract. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false xbrli:stringItemType string Assets Held for Sale Textuals Abstract. false 7 Ownership interest in proportionally consolidated joint venture sold 4 cop_ProportionallyConsolidatedJointVentureOwnershipPercentage cop false na instant The percentage of ownership in a proportionally consolidated joint venture. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false true false false 0.0903 0.0903 true false false xbrli:pureItemType pure The percentage of ownership in a proportionally consolidated joint venture. No authoritative reference available. false 8 Sales price of proportionally consolidated joint venture 4 cop_SalesPriceOfProportionallyConsolidatedJointVenture cop false debit instant Sales price of a proportionally consolidated joint venture. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 true true false false 4600000000 4600000000 true false false xbrli:monetaryItemType monetary Sales price of a proportionally consolidated joint venture. No authoritative reference available. false 9 Number of production barrels per day 4 cop_NumberOfProductionBarrelsPerDay cop false na duration Number of production barrels per day. false false false false false false false false false false false verboselabel false 1 false true false false 23000 23000 true false false 2 false false false false 0 0 true false false xbrli:integerItemType integer Number of production barrels per day. No authoritative reference available. false 10 Synthetic oil proved reserves in exploration and production segment (in barrels) 4 cop_SyntheticOilProvedReservesInExplorationAndProductionSegment cop false na instant Synthetic oil proved reserves in exploration and production segment. false false false false false false false false false false false verboselabel false 1 false true false false 248000000 248000000 true false false 2 false false false false 0 0 true false false xbrli:integerItemType integer Synthetic oil proved reserves in exploration and production segment. No authoritative reference available. false 12 Net carrying value of Syncrude 4 cop_DisposalGroupIncludingDiscontinuedOperationAssetOfDisposalGroup cop false na instant Description, in aggregate or in detail, of the major classifications and carrying amounts of total assets sold, or to be... false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false true false false 1750000000 1750000000 true false false xbrli:monetaryItemType monetary Description, in aggregate or in detail, of the major classifications and carrying amounts of total assets sold, or to be sold, as part of the disposal group, including a component of the entity (discontinued operation). No authoritative reference available. false 13 Amount of PP&E in carrying value of Syncrude 4 us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNet 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 true false false 2 false true false false 1970000000 1970000000 true false false xbrli:monetaryItemType monetary For the disposal group, including a component of the entity (discontinued operation), carrying value (net of accumulated depreciation and any write-downs) of tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year. Examples include land, buildings, vehicles and production equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph a false 14 Syncrude portion of Sales and other operating revenue, through dispositon date 4 cop_SyncrudePortionOfSalesAndOtherOperatingRevenueThroughDispositonDate cop false credit instant For a disposal group that is a component of the entity (discontinued operation), in the period in which the operations are... false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false true false false 327000000 327000000 true false false xbrli:monetaryItemType monetary For a disposal group that is a component of the entity (discontinued operation), in the period in which the operations are initially classified as discontinued, the amounts of intercompany revenue that were previously eliminated in consolidation for periods before the disposal transaction (in situations where revenue and cost producing activities with the disposed component will continue after disposal). No authoritative reference available. false 15 Syncrude portion of Income before income taxes, through dispositon date 4 cop_SyncrudePortionOfIncomeBeforeIncomeTaxesThroughDispositonDate cop false credit instant Pretax income (loss) from operations of a business component (exclusive of any gain or loss on disposal, or provision... false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false true false false 127000000 127000000 true false false xbrli:monetaryItemType monetary Pretax income (loss) from operations of a business component (exclusive of any gain or loss on disposal, or provision therefore) during the reporting period, until its disposal. No authoritative reference available. false 16 Syncrude portion of Net income, through dispositon date 4 cop_SyncrudePortionOfNetIncomeThroughDispositonDate cop false credit instant After tax income (loss) from operations of a business component (exclusive of any gain or loss on disposal, or provision... false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 true true false false 93000000 93000000 true false false xbrli:monetaryItemType monetary After tax income (loss) from operations of a business component (exclusive of any gain or loss on disposal, or provision therefore) during the reporting period, until its disposal. No authoritative reference available. false 2 10 false NoRounding UnKnown UnKnown false true