2.2.0.7 true Impairments (Details) (USD $) 0608 - Disclosure - Impairments (Details) true false In Millions false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 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 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 3 USD true false false false us-gaap_RefiningEquipmentMember us-gaap_StatementBusinessSegmentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_RefiningEquipmentMember us-gaap_StatementBusinessSegmentsAxis explicitMember false false cop_OffshoreDevelopmentFacilityMember us-gaap_StatementGeographicalAxis xbrldi http://xbrl.org/2006/xbrldi cop_OffshoreDevelopmentFacilityMember us-gaap_StatementGeographicalAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 4 USD true false false false cop_FairValueMember us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisDisclosureItemsAxis xbrldi http://xbrl.org/2006/xbrldi cop_FairValueMember us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisDisclosureItemsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 5 USD true false false false cop_FairValueMember us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisDisclosureItemsAxis xbrldi http://xbrl.org/2006/xbrldi cop_FairValueMember us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisDisclosureItemsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 6 USD true false false false us-gaap_FairValueInputsLevel1Member us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisDisclosureItemsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueInputsLevel1Member us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisDisclosureItemsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 7 USD true false false false us-gaap_FairValueInputsLevel1Member us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisDisclosureItemsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueInputsLevel1Member us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisDisclosureItemsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 8 USD true false false false us-gaap_FairValueInputsLevel3Member us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisDisclosureItemsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueInputsLevel3Member us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisDisclosureItemsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 9 USD true false false false us-gaap_FairValueInputsLevel3Member us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisDisclosureItemsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueInputsLevel3Member us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisDisclosureItemsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 10 USD true false false false cop_BeforeTaxLossMember us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisDisclosureItemsAxis xbrldi http://xbrl.org/2006/xbrldi cop_BeforeTaxLossMember us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisDisclosureItemsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 11 USD true false false false cop_BeforeTaxLossMember us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisDisclosureItemsAxis xbrldi http://xbrl.org/2006/xbrldi cop_BeforeTaxLossMember us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisDisclosureItemsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 12 USD true false false false cop_FairValueNetOfCostMember us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis xbrldi http://xbrl.org/2006/xbrldi cop_FairValueNetOfCostMember us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 13 USD true false false false cop_CostOfSalesRelatedToFairValueMember us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis xbrldi http://xbrl.org/2006/xbrldi cop_CostOfSalesRelatedToFairValueMember us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 14 USD true false false false cop_CostOfSalesRelatedToFairValueMember us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis xbrldi http://xbrl.org/2006/xbrldi cop_CostOfSalesRelatedToFairValueMember us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 15 USD true false false false us-gaap_CarryingReportedAmountFairValueDisclosureMember us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_CarryingReportedAmountFairValueDisclosureMember us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 16 USD true false false false us-gaap_CarryingReportedAmountFairValueDisclosureMember us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_CarryingReportedAmountFairValueDisclosureMember us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 17 USD true false false false cop_RefineryMember us-gaap_StatementGeographicalAxis xbrldi http://xbrl.org/2006/xbrldi cop_RefineryMember us-gaap_StatementGeographicalAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 18 USD true false false false us-gaap_ForeignCountryMember us-gaap_StatementGeographicalAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_ForeignCountryMember us-gaap_StatementGeographicalAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ 5 Impairment Charges by Segment, before-tax 3 cop_ImpairmentChargesBySegmentBeforeTax cop false na duration Impairment Charges by Segment, before-tax. 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false xbrli:stringItemType string Impairment Charges by Segment, before-tax. false 6 Impairments 4 us-gaap_AssetImpairmentCharges us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 true true false false 59000000 59 false false false 2 true true false false 1682000000 1682 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false xbrli:monetaryItemType monetary The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 45, 46, 47 false 7 Before-tax property impairment 4 us-gaap_ImpairedAssetsToBeDisposedOfByMethodOtherThanSaleAmountOfImpairmentLoss us-gaap true debit duration No definition available. false false false false false false 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 3 false true false false 98000000 98 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false true false false 51000000 51 true false false xbrli:monetaryItemType monetary Loss recognized as a result of the initial and subsequent write-down of a long-lived asset's carrying amount to fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 27, 26 false 8 Impairment of refinery 4 cop_ImpairmentOfRefinery cop false debit duration Impairment of refinery. false false false false false false 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false true false false 1502000000 1502 true false false 18 false false false false 0 0 true false false xbrli:monetaryItemType monetary Impairment of refinery. No authoritative reference available. false 11 Fair value of assets measured on nonrecurring basis 3 us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisAbstract us-gaap true na duration No definition available. 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false xbrli:stringItemType string No definition available. false 12 Net properties, plants and equipment (held for use) 4 cop_NetPropertiesPlantsAndEquipmentMeasuredOnNonrecurringBasisHeldForUse cop false debit instant Net properties, plants and equipment measured on nonrecurring basis held for use. false false false false false false false false false false false verboselabel false 1 false true false false 1588000000 1588 [1] false false false 2 false true false false 1588000000 1588 [1] false false false 3 false false false false 0 0 true false false 4 false true false false 297000000 297 true false false 5 false true false false 210000000 210 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false true false false 297000000 297 true false false 9 false true false false 210000000 210 true false false 10 false false false false 0 0 true false false 11 false true false false 385000000 385 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false true false false 1885000000 1885 true false false 16 false true false false 610000000 610 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false xbrli:monetaryItemType monetary Net properties, plants and equipment measured on nonrecurring basis held for use. No authoritative reference available. false 13 Net properties, plants and equipment (held for sale) 4 cop_NetPropertiesPlantsAndEquipmentMeasuredOnNonrecurringBasisHeldForSale cop false debit instant Net properties, plants and equipment measured on nonrecurring basis held for sale. false false false false false false 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 3 false false false false 0 0 true false false 4 false true false false 23000000 23 true false false 5 false true false false 121000000 121 true false false 6 false true false false 23000000 23 true false false 7 false true false false 35000000 35 true false false 8 false false false false 0 0 true false false 9 false true false false 86000000 86 true false false 10 false true false false 43000000 43 true false false 11 false true false false 62000000 62 true false false 12 false true false false 116000000 116 true false false 13 false true false false 2000000 2 true false false 14 false true false false 5000000 5 true false false 15 false true false false 64000000 64 true false false 16 false true false false 178000000 178 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false xbrli:monetaryItemType monetary Net properties, plants and equipment measured on nonrecurring basis held for sale. No authoritative reference available. false 14 Net proceed net properties, plants and equipment (held for sale) 4 cop_NetProceedNetPropertiesPlantsAndEquipmentMeasuredOnNonrecurringBasisHeldForSale cop false debit instant Net proceed net properties plants and equipment measured on nonrecurring basis held for sale. false false false false false false false false false false false verboselabel false 1 false true false false 21000000 21 false false false 2 false true false false 21000000 21 false false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false xbrli:monetaryItemType monetary Net proceed net properties plants and equipment measured on nonrecurring basis held for sale. No authoritative reference available. false 15 Equity method investments 4 cop_EquityMethodInvestmentsOfAssetsMeasuredOnNonrecurringBasis cop false debit instant Equity method investments of assets measured on nonrecurring basis. false false false false false false 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 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 true true false false 1784000000 1784 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 true true false false 1784000000 1784 true false false 10 false false false false 0 0 true false false 11 true true false false 286000000 286 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 true true false false 2070000000 2070 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false xbrli:monetaryItemType monetary Equity method investments of assets measured on nonrecurring basis. No authoritative reference available. false 1 *Includes a $55 million leasehold impairment charged to exploration expenses 18 9 false Millions UnKnown UnKnown false true