2.2.0.7 false Consolidated Income Statement (USD $) 0110 - Statement - Consolidated Income Statement true false In Millions, except Share data in Thousands, unless otherwise specified 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 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 3 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 4 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 $ 3 1 cop_RevenuesAndOtherIncomeAbstract cop false na duration Revenues and Other Income. 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 Revenues and Other Income. false 4 2 us-gaap_SalesRevenueNet us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 true true false false 45686000000 45686 [1] false false false 2 true true false false 35448000000 35448 [1] false false false 3 true true false false 90507000000 90507 [1] false false false 4 true true false false 66189000000 66189 [1] false false false xbrli:monetaryItemType monetary Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 false 5 2 us-gaap_IncomeLossFromEquityMethodInvestments us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1088000000 1088 false false false 2 false true false false 632000000 632 [2] false false false 3 false true false false 1956000000 1956 false false false 4 false true false false 1005000000 1005 [2] false false false xbrli:monetaryItemType monetary This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Such amount typically reflects adjustments similar to those made in preparing consolidated statements, including adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 19 -Subparagraph c Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 6 -Subparagraph b false 6 2 us-gaap_GainLossOnSaleOfOilAndGasProperty us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 2878000000 2878 false false false 2 false false false false 0 0 false false false 3 false true false false 2878000000 2878 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Gain or loss recorded from sale of oil and gas properties, includes the realized gains (losses) on the sale of proved and unproved oil and gas properties. 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 19 -Paragraph 41, 44, 45, 46, 47 false 7 2 us-gaap_OtherNonoperatingIncome us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 475000000 475 false false false 2 false true false false 106000000 106 false false false 3 false true false false 548000000 548 false false false 4 false true false false 230000000 230 false false false xbrli:monetaryItemType monetary The aggregate amount of other income amounts resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items. 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No authoritative reference available. true 9 1 cop_CostAndExpensesAbstract cop false na duration Costs and Expenses. 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 Costs and Expenses. false 10 2 us-gaap_CostOfPurchasedOilAndGas us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 32088000000 32088 false false false 2 false true false false 24609000000 24609 false false false 3 false true false false 63609000000 63609 false false false 4 false true false false 44368000000 44368 false false false xbrli:monetaryItemType monetary Cost of oil and gas purchased during the reporting period. No authoritative reference available. false 11 2 cop_ProductionAndOperatingExpenses cop false debit duration Generally recurring costs associated with normal operations, excluding DD&A; Selling, General and Administrative Expense;... false false false false false false false false false false false label false 1 false true false false 2619000000 2619 false false false 2 false true false false 2573000000 2573 false false false 3 false true false false 5146000000 5146 false false false 4 false true false false 5118000000 5118 false false false xbrli:monetaryItemType monetary Generally recurring costs associated with normal operations, excluding DD&A; Selling, General and Administrative Expense; Accretion; and Exploration Expense. No authoritative reference available. false 12 2 us-gaap_SellingGeneralAndAdministrativeExpense us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 438000000 438 false false false 2 false true false false 476000000 476 false false false 3 false true false false 882000000 882 false false false 4 false true false false 951000000 951 false false false xbrli:monetaryItemType monetary The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. 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Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells. 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Also includes excise taxes. No authoritative reference available. false 17 2 cop_AccretionOnDiscountedLiabilities cop false debit duration Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present value,... false false false false false false false false false false false verboselabel false 1 false true false false 113000000 113 false false false 2 false true false false 108000000 108 false false false 3 false true false false 227000000 227 false false false 4 false true false false 212000000 212 false false false xbrli:monetaryItemType monetary Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present value, including accretion associated with asset retirement obligations, decommissioning, environmental, and other contingencies. No authoritative reference available. false 18 2 us-gaap_InterestAndDebtExpense us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 349000000 349 false false false 2 false true false false 268000000 268 false false false 3 false true false false 650000000 650 false false false 4 false true false false 578000000 578 false false false xbrli:monetaryItemType monetary Interest and debt related expenses associated with nonoperating financing activities of the entity. 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Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains or losses may be disclosed as dealer gains or losses. 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No authoritative reference available. true 21 1 cop_IncomeLossBeforeIncomeTaxes cop false credit duration Sum of operating profit and nonoperating income (expense) before income taxes and minority interest, and including equity in... false false false false false false false false false false false verboselabel false 1 false true false false 6194000000 6194 false false false 2 false true false false 1938000000 1938 [2] false false false 3 false true false false 10184000000 10184 false false false 4 false true false false 3930000000 3930 [2] false false false xbrli:monetaryItemType monetary Sum of operating profit and nonoperating income (expense) before income taxes and minority interest, and including equity in earnings of affiliates. 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If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. 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