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No authoritative reference available. false 7 Amounts of Level 3 gains (losses) 2 cop_AmountsOfLevel3GainsLossesAbstract cop false na duration Amounts of Level 3 gains losses 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 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string Amounts of Level 3 gains losses Abstract. false 8 Total gains (losses) included in earnings 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 41000000 41 false false false 2 false true false false -10000000 -10 false false false 3 false true false false 95000000 95 false false false 4 false true false false 8000000 8 false false false xbrli:monetaryItemType monetary This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value. 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No authoritative reference available. false 12 Amounts of Level 3 gains (losses) 2 cop_AmountsOfLevel3GainsLossesAbstract cop false na duration Amounts of Level 3 gains losses 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 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string Amounts of Level 3 gains losses Abstract. false 13 Total gains (losses) included in earnings 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false -13000000 -13 false false false 2 false false false false 0 0 false false false 3 false true false false -35000000 -35 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value. 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Such unrealized (holding) gains or losses relate to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). 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