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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 4 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 5 false false false false 0 0 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 5 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 5 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 6 2 us-gaap_OtherNonoperatingIncome 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 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 5 false false false false 0 0 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 80 -Subparagraph Exhibit 4-4 -IssueDate 2006-05-01 false 8 2 cop_TotalRevenuesAndOtherIncome cop false credit duration Aggregate revenue recognized during the period, including Other Income and Equity in Earnings of Affiliates. false false false false false false false false false false false totallabel false 1 false true false false 50127000000 50127 false false false 2 false true false false 36186000000 36186 [2] false false false 3 false true false false 95889000000 95889 false false false 4 false true false false 67424000000 67424 [2] false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Aggregate revenue recognized during the period, including Other Income and Equity in Earnings of Affiliates. No authoritative reference available. true 9 2 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 5 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 5 false false false false 0 0 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 5 false false false false 0 0 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 5 false false false false 0 0 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. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 4 -Paragraph 5A false 13 2 us-gaap_ExplorationExpense 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 213000000 213 false false false 2 false true false false 243000000 243 false false false 3 false true false false 596000000 596 false false false 4 false true false false 468000000 468 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph a -Subparagraph 15 -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-OGP -Chapter 2 -Paragraph 48 -IssueDate 2006-05-01 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 17 false 14 2 us-gaap_DepreciationDepletionAndAmortization 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 2280000000 2280 false false false 2 false true false false 2347000000 2347 false false false 3 false true false false 4598000000 4598 false false false 4 false true false false 4577000000 4577 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. No authoritative reference available. false 15 2 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 false true false false 1532000000 1532 false false false 2 false true false false 51000000 51 false false false 3 false true false false 1623000000 1623 false false false 4 false true false false 54000000 54 false false false 5 false false false false 0 0 false 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 16 2 cop_TaxesOtherThanIncomeTaxes cop false debit duration Taxes other than income taxes, if not included elsewhere, that could include, payroll tax, property tax or other selling and... false false false false false false false false false false false verboselabel false 1 false true false false 4247000000 4247 [1] false false false 2 false true false false 3715000000 3715 [1] false false false 3 false true false false 8284000000 8284 [1] false false false 4 false true false false 7179000000 7179 [1] false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Taxes other than income taxes, if not included elsewhere, that could include, payroll tax, property tax or other selling and distribution-related taxes. 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 5 false false false false 0 0 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 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Interest and debt related expenses associated with nonoperating financing activities of the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 false 19 2 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax us-gaap true credit duration No definition available. false false false false false false false false false false true negatedtotal false 1 false true false false 54000000 54 false false false 2 false true false false -142000000 -142 false false false 3 false true false false 90000000 90 false false false 4 false true false false -11000000 -11 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate foreign currency transaction gain or loss (both realized and unrealized) included in determining net income for the reporting period. 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 30 true 20 2 cop_TotalCostsAndExpenses cop false debit duration Total costs and expenses, including operating expenses and non-operating expenses. false false false false false false false false false false false totallabel false 1 false true false false 43933000000 43933 false false false 2 false true false false 34248000000 34248 false false false 3 false true false false 85705000000 85705 false false false 4 false true false false 63494000000 63494 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Total costs and expenses, including operating expenses and non-operating expenses. No authoritative reference available. true 21 2 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 5 false false false false 0 0 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. No authoritative reference available. false 22 2 us-gaap_IncomeTaxExpenseBenefit 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 2011000000 2011 false false false 2 false true false false 1063000000 1063 [2] false false false 3 false true false false 3889000000 3889 false false false 4 false true false false 2239000000 2239 [2] false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b true 23 2 us-gaap_ProfitLoss 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 4183000000 4183 false false false 2 false true false false 875000000 875 [2] false false false 3 false true false false 6295000000 6295 false false false 4 false true false false 1691000000 1691 [2] false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) false 24 2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest us-gaap true debit duration No definition available. false false false false false false false false false false true negatedtotal false 1 false true false false -19000000 -19 false false false 2 false true false false -16000000 -16 false false false 3 false true false false -33000000 -33 false false false 4 false true false false -32000000 -32 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The portion of net income (loss) attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 true 25 2 us-gaap_NetIncomeLoss 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 4164000000 4164 false false false 2 false true false false 859000000 859 [2] false false false 3 false true false false 6262000000 6262 false false false 4 false true false false 1659000000 1659 [2] false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 true 26 2 us-gaap_AssetsAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 27 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 4120000000 4120 false false false 2 false true false false 888000000 888 false false false 3 false true false false 4120000000 4120 false false false 4 false true false false 888000000 888 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a -Article 5 false 29 2 us-gaap_InventoryNet us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 7119000000 7119 false false false 2 false false false false 0 0 false false false 3 false true false false 7119000000 7119 false false false 4 false false false false 0 0 false false false 5 false true false false 4940000000 4940 false false false xbrli:monetaryItemType monetary Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer). No authoritative reference available. false 31 2 cop_PrepaidExpensesAndOtherCurrentAssets cop false debit instant Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of... false false false false false false false false false false false totallabel false 1 false true false false 2230000000 2230 false false false 2 false false false false 0 0 false false false 3 false true false false 2230000000 2230 false false false 4 false false false false 0 0 false false false 5 false true false false 2470000000 2470 false false false xbrli:monetaryItemType monetary Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer. Also included is the aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet due to materiality considerations. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer.) No authoritative reference available. true 32 2 us-gaap_AssetsCurrent us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 26666000000 26666 false false false 2 false false false false 0 0 false false false 3 false true false false 26666000000 26666 false false false 4 false false false false 0 0 false false false 5 false true false false 21167000000 21167 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 9 -Article 5 false 33 2 cop_InvestmentsAndLongTermReceivablesIncludingLoansAndAdvancesRelatedParties cop false debit instant Investments and long-term receivables including Loans and advances-related parties. false false false false false false false false false false false verboselabel false 1 false true false false 38351000000 38351 [3] false false false 2 false false false false 0 0 false false false 3 false true false false 38351000000 38351 [3] false false false 4 false false false false 0 0 false false false 5 false true false false 38094000000 38094 [2],[3] false false false xbrli:monetaryItemType monetary Investments and long-term receivables including Loans and advances-related parties. No authoritative reference available. false 34 2 us-gaap_PropertyPlantAndEquipmentNet us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 81269000000 81269 false false false 2 false false false false 0 0 false false false 3 false true false false 81269000000 81269 false false false 4 false false false false 0 0 false false false 5 false true false false 87708000000 87708 false false false xbrli:monetaryItemType monetary 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; net of accumulated depreciation. Examples include land, buildings, and production equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 12 -Paragraph 5 -Subparagraph b, c Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 false 35 2 us-gaap_Goodwill us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 3638000000 3638 false false false 2 false false false false 0 0 false false false 3 false true false false 3638000000 3638 false false false 4 false false false false 0 0 false false false 5 false true false false 3638000000 3638 false false false xbrli:monetaryItemType monetary Carrying amount as of the balance sheet date, which is the cumulative amount paid, adjusted for any amortization recognized prior to adoption of FAS 142 and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 43 false 36 2 us-gaap_IntangibleAssetsNetExcludingGoodwill us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 808000000 808 false false false 2 false false false false 0 0 false false false 3 false true false false 808000000 808 false false false 4 false false false false 0 0 false false false 5 false true false false 823000000 823 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 42, 45 false 37 2 us-gaap_OtherAssetsNoncurrent us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 724000000 724 false false false 2 false false false false 0 0 false false false 3 false true false false 724000000 724 false false false 4 false false false false 0 0 false false false 5 false true false false 708000000 708 false false false xbrli:monetaryItemType monetary Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet due to materiality considerations. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 true 38 2 us-gaap_Assets us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 151456000000 151456 false false false 2 false false false false 0 0 false false false 3 false true false false 151456000000 151456 false false false 4 false false false false 0 0 false false false 5 false true false false 152138000000 152138 [2] false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 25 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 true 39 2 us-gaap_LiabilitiesAndStockholdersEquityAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 40 2 us-gaap_AccountsPayableCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 15376000000 15376 false false false 2 false false false false 0 0 false false false 3 false true false false 15376000000 15376 false false false 4 false false false false 0 0 false false false 5 false true false false 15485000000 15485 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 false 41 2 us-gaap_DebtCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 3082000000 3082 false false false 2 false false false false 0 0 false false false 3 false true false false 3082000000 3082 false false false 4 false false false false 0 0 false false false 5 false true false false 1728000000 1728 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of the sum of short-term debt and current maturities of long-term debt and capital lease obligations, which are due within one year (or one business cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 false 42 2 us-gaap_TaxesPayableCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 4508000000 4508 false false false 2 false false false false 0 0 false false false 3 false true false false 4508000000 4508 false false false 4 false false false false 0 0 false false false 5 false true false false 3402000000 3402 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5 false 43 2 cop_EmployeeBenefitObligationsCurrent cop false credit instant Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for... false false false false false false false false false false false verboselabel false 1 false true false false 667000000 667 false false false 2 false false false false 0 0 false false false 3 false true false false 667000000 667 false false false 4 false false false false 0 0 false false false 5 false true false false 846000000 846 false false false xbrli:monetaryItemType monetary Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses. For classified balance sheets, used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer); for unclassified balance sheets, used to reflect the total liabilities (regardless of due date). No authoritative reference available. false 44 2 us-gaap_OtherLiabilitiesCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 2035000000 2035 false false false 2 false false false false 0 0 false false false 3 false true false false 2035000000 2035 false false false 4 false false false false 0 0 false false false 5 false true false false 2234000000 2234 false false false xbrli:monetaryItemType monetary Aggregate carrying amount, as of the balance sheet date, of current obligations not separately disclosed in the balance sheet due to materiality considerations. Current liabilities are expected to be paid within one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 3 -Section A -Paragraph 8 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 6 -Paragraph 15 true 45 2 us-gaap_LiabilitiesCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 25668000000 25668 false false false 2 false false false false 0 0 false false false 3 false true false false 25668000000 25668 false false false 4 false false false false 0 0 false false false 5 false true false false 23695000000 23695 false false false xbrli:monetaryItemType monetary Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 21 -Article 5 false 46 2 us-gaap_LongTermDebtAndCapitalLeaseObligations us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 23197000000 23197 false false false 2 false false false false 0 0 false false false 3 false true false false 23197000000 23197 false false false 4 false false false false 0 0 false false false 5 false true false false 26925000000 26925 false false false xbrli:monetaryItemType monetary Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H false 47 2 cop_AssetRetirementObligationsAndAccruedEnvironmentalCosts cop false credit instant Non current portion of the carrying amount of a liability for an asset retirement obligation, as well as the carrying value... false false false false false false false false false false false label false 1 false true false false 8389000000 8389 false false false 2 false false false false 0 0 false false false 3 false true false false 8389000000 8389 false false false 4 false false false false 0 0 false false false 5 false true false false 8713000000 8713 false false false xbrli:monetaryItemType monetary Non current portion of the carrying amount of a liability for an asset retirement obligation, as well as the carrying value of an obligation (known or estimated) arising from requirements to perform activities to remediate one of more sites, payable after twelve months or beyond the next operating cycle if longer. No authoritative reference available. false 48 2 us-gaap_DueToRelatedPartiesNoncurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 4666000000 4666 false false false 2 false false false false 0 0 false false false 3 false true false false 4666000000 4666 false false false 4 false false false false 0 0 false false false 5 false true false false 5009000000 5009 false false false xbrli:monetaryItemType monetary Portion of the carrying amount as of the balance sheet date of obligations due all related parties that is payable after one year or beyond the normal operating cycle if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 57 -Paragraph 2 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 23 -Article 5 false 49 2 us-gaap_DeferredTaxLiabilitiesNoncurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 17012000000 17012 false false false 2 false false false false 0 0 false false false 3 false true false false 17012000000 17012 false false false 4 false false false false 0 0 false false false 5 false true false false 17956000000 17956 [2] false false false xbrli:monetaryItemType monetary Represents the noncurrent portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A noncurrent taxable temporary difference is a difference between the tax basis and the carrying amount of a noncurrent asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. In a classified statement of financial position, an enterprise shall separate deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets shall be classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, shall be classified according to the expected reversal date of the temporary difference. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 41, 42 false 50 2 cop_EmployeeBenefitObligationsNoncurrent cop false credit instant For classified balance sheets this represents the noncurrent liability for underfunded plans recognized in the balance sheet... false false false false false false false false false false false verboselabel false 1 false true false false 3836000000 3836 false false false 2 false false false false 0 0 false false false 3 false true false false 3836000000 3836 false false false 4 false false false false 0 0 false false false 5 false true false false 4130000000 4130 false false false xbrli:monetaryItemType monetary For classified balance sheets this represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit plans. No authoritative reference available. false 51 2 us-gaap_OtherLiabilitiesNoncurrent us-gaap true credit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 2743000000 2743 false false false 2 false false false false 0 0 false false false 3 false true false false 2743000000 2743 false false false 4 false false false false 0 0 false false false 5 false true false false 3097000000 3097 false false false xbrli:monetaryItemType monetary Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet due to materiality considerations. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 24 -Article 5 true 52 2 us-gaap_Liabilities us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 85511000000 85511 false false false 2 false false false false 0 0 false false false 3 false true false false 85511000000 85511 false false false 4 false false false false 0 0 false false false 5 false true false false 89525000000 89525 [2] false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. No authoritative reference available. false 53 2 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 36917000000 36917 false false false 2 false false false false 0 0 false false false 3 false true false false 36917000000 36917 false false false 4 false false false false 0 0 false false false 5 false true false false 32214000000 32214 [2] false false false xbrli:monetaryItemType monetary The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 false 54 2 cop_OtherCommonStockholdersEquity cop false credit instant Other common stockholders' equity, excluding retained earnings and noncontrolling interest. false false false false false false false false false false false verboselabel false 1 false true false false 28454000000 28454 false false false 2 false false false false 0 0 false false false 3 false true false false 28454000000 28454 false false false 4 false false false false 0 0 false false false 5 false true false false 29809000000 29809 false false false xbrli:monetaryItemType monetary Other common stockholders' equity, excluding retained earnings and noncontrolling interest. No authoritative reference available. false 55 2 us-gaap_MinorityInterest us-gaap true credit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 574000000 574 false false false 2 false false false false 0 0 false false false 3 false true false false 574000000 574 false false false 4 false false false false 0 0 false false false 5 false true false false 590000000 590 false false false xbrli:monetaryItemType monetary Total of all Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 27 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 26 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A3 -Appendix A true 56 2 us-gaap_LiabilitiesAndStockholdersEquity us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 151456000000 151456 false false false 2 false false false false 0 0 false false false 3 false true false false 151456000000 151456 false false false 4 false false false false 0 0 false false false 5 false true false false 152138000000 152138 [2] false false false xbrli:monetaryItemType monetary Total of all Liabilities and Stockholders' Equity items. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 32 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 25 -Article 7 false 57 2 us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities include all transactions and events that are not defined as investing or financing activities. Operating activities generally involve producing and delivering goods and providing services. Cash flows from operating activities are generally the cash effects of transactions and other events that enter into the determination of net income. false 58 2 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration No definition available. false false false false false false false false false false false terselabel 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 6515000000 6515 false false false 4 false true false false 4452000000 4452 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. 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 95 -Paragraph 26 false 59 2 us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 60 2 cop_CapitalExpendituresAndInvestments cop false credit duration Cash outflows for purchases of and capital improvements on property, plant and equipment (capital expenditures), software,... false false false false false false false false false false true negated 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 -4080000000 -4080 false false false 4 false true false false -5578000000 -5578 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Cash outflows for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets as well as net cash outflows associated with the acquisition of investments. No authoritative reference available. false 61 2 cop_ProceedsFromAssetDispositions cop false debit duration Cash inflows from disposals of property, plant and equipment (property dispositions) as well as net cash inflows associated... 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 5943000000 5943 false false false 4 false true false false 232000000 232 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Cash inflows from disposals of property, plant and equipment (property dispositions) as well as net cash inflows associated with the sale of investments. No authoritative reference available. false 62 2 us-gaap_PaymentsForAdvanceToAffiliate us-gaap true credit duration No definition available. false false false false false false false false false false true negated 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 -269000000 -269 false false false 4 false true false false -121000000 -121 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash outflow from advancing money to an affiliate (an entity that is related but not strictly controlled by the entity). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph a false 63 2 us-gaap_ProceedsFromCollectionOfAdvanceToAffiliate 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 80000000 80 false false false 4 false true false false 36000000 36 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash inflow from the collection of money previously advanced to an entity that is related to it but not strictly controlled. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph a false 64 2 us-gaap_PaymentsForProceedsFromOtherInvestingActivities us-gaap true credit duration No definition available. false false false false false false false false false false true negatedtotal 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 9000000 9 false false false 4 false true false false -77000000 -77 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net cash outflow (inflow) from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 true 65 2 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel 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 1683000000 1683 false false false 4 false true false false -5508000000 -5508 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from investing activity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 false 66 2 us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 67 2 cop_IssuanceOfDebt cop false debit duration The cash inflow due to total proceeds from additional borrowings. 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 65000000 65 false false false 4 false true false false 9029000000 9029 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash inflow due to total proceeds from additional borrowings. No authoritative reference available. false 68 2 cop_RepaymentOfDebt cop false debit duration The cash outflow due to total repayments of additional borrowing. 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 -2435000000 -2435 false false false 4 false true false false -6109000000 -6109 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash outflow due to total repayments of additional borrowing. No authoritative reference available. false 69 2 us-gaap_ProceedsFromIssuanceOfCommonStock 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 35000000 35 false false false 4 false true false false -21000000 -21 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash inflow from the additional capital contribution to the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a false 70 2 us-gaap_PaymentsForRepurchaseOfCommonStock us-gaap true credit duration No definition available. false false false false false false false false false false true negated 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 -390000000 -390 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash outflow to reacquire common stock during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a false 71 2 us-gaap_PaymentsOfDividendsCommonStock us-gaap true credit duration No definition available. false false false false false false false false false false true negated 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 -1560000000 -1560 false false false 4 false true false false -1393000000 -1393 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash outflow from the distribution of an entity's earnings in the form of dividends to common shareholders. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18, 19, 20 true 73 2 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel 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 -4640000000 -4640 false false false 4 false true false false 1100000000 1100 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from financing activity for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 74 2 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel 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 20000000 20 false false false 4 false true false false 89000000 89 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The effect of exchange rate changes on cash balances held in foreign currencies. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 25 true 75 2 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na 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 3578000000 3578 false false false 4 false true false false 133000000 133 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net change between the beginning and ending balance of cash and cash equivalents. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 false 76 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false true false false periodstartlabel 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 542000000 542 false false false 4 false true false false 755000000 755 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. 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It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. 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No authoritative reference available. false 79 2 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 5 false false false false 0 0 false false false xbrli:stringItemType string Revenues and Other Income. false 81 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 4305000000 4305 false false false 2 false true false false 948000000 948 false false false 3 false true false false 6537000000 6537 false false false 4 false true false false 1837000000 1837 false false false 5 false false false false 0 0 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 83 2 us-gaap_OtherNonoperatingIncome us-gaap true credit 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 true false false 1000000 1 false false false 3 false false false false 0 0 false false false 4 false true false false -1000000 -1 false false false 5 false false false false 0 0 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 80 -Subparagraph Exhibit 4-4 -IssueDate 2006-05-01 false 84 2 cop_IntercompanyRevenues cop false credit duration Intercompany revenues. false false false false false false false false false false false totallabel false 1 false true false false 2000000 2 false false false 2 false true false false 15000000 15 false false false 3 false true false false 3000000 3 false false false 4 false true false false 16000000 16 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Intercompany revenues. No authoritative reference available. true 85 2 cop_TotalRevenuesAndOtherIncome cop false credit duration Aggregate revenue recognized during the period, including Other Income and Equity in Earnings of Affiliates. false false false false false false false false false false false totallabel false 1 false true false false 4307000000 4307 false false false 2 false true false false 964000000 964 false false false 3 false true false false 6540000000 6540 false false false 4 false true false false 1852000000 1852 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Aggregate revenue recognized during the period, including Other Income and Equity in Earnings of Affiliates. No authoritative reference available. true 86 2 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 5 false false false false 0 0 false false false xbrli:stringItemType string Costs and Expenses. false 88 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 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 true false false 2000000 2 false false false 5 false false false false 0 0 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 89 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 3000000 3 false false false 2 false true false false 5000000 5 false false false 3 false true false false 7000000 7 false false false 4 false true false false 8000000 8 false false false 5 false false false false 0 0 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. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 4 -Paragraph 5A false 95 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 216000000 216 false false false 2 false true false false 149000000 149 false false false 3 false true false false 419000000 419 false false false 4 false true false false 279000000 279 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Interest and debt related expenses associated with nonoperating financing activities of the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 false 97 2 cop_TotalCostsAndExpenses cop false debit duration Total costs and expenses, including operating expenses and non-operating expenses. false false false false false false false false false false false totallabel false 1 false true false false 219000000 219 false false false 2 false true false false 154000000 154 false false false 3 false true false false 426000000 426 false false false 4 false true false false 289000000 289 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Total costs and expenses, including operating expenses and non-operating expenses. No authoritative reference available. true 98 2 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 4088000000 4088 false false false 2 false true false false 810000000 810 false false false 3 false true false false 6114000000 6114 false false false 4 false true false false 1563000000 1563 false false false 5 false false false false 0 0 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. No authoritative reference available. false 99 2 us-gaap_IncomeTaxExpenseBenefit 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 -76000000 -76 false false false 2 false true false false -49000000 -49 false false false 3 false true false false -148000000 -148 false false false 4 false true false false -96000000 -96 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b true 100 2 us-gaap_ProfitLoss 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 4164000000 4164 false false false 2 false true false false 859000000 859 false false false 3 false true false false 6262000000 6262 false false false 4 false true false false 1659000000 1659 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) false 102 2 us-gaap_NetIncomeLoss 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 4164000000 4164 false false false 2 false true false false 859000000 859 false false false 3 false true false false 6262000000 6262 false false false 4 false true false false 1659000000 1659 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 true 103 2 us-gaap_AssetsAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 105 2 us-gaap_ReceivablesNetCurrent us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 24000000 24 false false false 2 false false false false 0 0 false false false 3 false true false false 24000000 24 false false false 4 false false false false 0 0 false false false 5 false true false false 26000000 26 false false false xbrli:monetaryItemType monetary The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a -Article 5 false 108 2 cop_PrepaidExpensesAndOtherCurrentAssets cop false debit instant Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of... false false false false false false false false false false false totallabel false 1 false true false false 18000000 18 false false false 2 false false false false 0 0 false false false 3 false true false false 18000000 18 false false false 4 false false false false 0 0 false false false 5 false true false false 13000000 13 false false false xbrli:monetaryItemType monetary Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer. Also included is the aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet due to materiality considerations. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer.) No authoritative reference available. true 109 2 us-gaap_AssetsCurrent us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 42000000 42 false false false 2 false false false false 0 0 false false false 3 false true false false 42000000 42 false false false 4 false false false false 0 0 false false false 5 false true false false 39000000 39 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 9 -Article 5 false 110 2 cop_InvestmentsAndLongTermReceivablesIncludingLoansAndAdvancesRelatedParties cop false debit instant Investments and long-term receivables including Loans and advances-related parties. false false false false false false false false false false false verboselabel false 1 false true false false 76121000000 76121 [3] false false false 2 false false false false 0 0 false false false 3 false true false false 76121000000 76121 [3] false false false 4 false false false false 0 0 false false false 5 false true false false 70769000000 70769 [3] false false false xbrli:monetaryItemType monetary Investments and long-term receivables including Loans and advances-related parties. No authoritative reference available. false 114 2 us-gaap_OtherAssetsNoncurrent us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 59000000 59 false false false 2 false false false false 0 0 false false false 3 false true false false 59000000 59 false false false 4 false false false false 0 0 false false false 5 false true false false 55000000 55 false false false xbrli:monetaryItemType monetary Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet due to materiality considerations. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 true 115 2 us-gaap_Assets us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 76222000000 76222 false false false 2 false false false false 0 0 false false false 3 false true false false 76222000000 76222 false false false 4 false false false false 0 0 false false false 5 false true false false 70863000000 70863 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 25 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 true 116 2 us-gaap_LiabilitiesAndStockholdersEquityAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 117 2 us-gaap_AccountsPayableCurrent us-gaap true credit instant 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 false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 7000000 7 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 false 118 2 us-gaap_DebtCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -5000000 -5 false false false 2 false false false false 0 0 false false false 3 false true false false -5000000 -5 false false false 4 false false false false 0 0 false false false 5 false true false false 235000000 235 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of the sum of short-term debt and current maturities of long-term debt and capital lease obligations, which are due within one year (or one business cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 false 121 2 us-gaap_OtherLiabilitiesCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 242000000 242 false false false 2 false false false false 0 0 false false false 3 false true false false 242000000 242 false false false 4 false false false false 0 0 false false false 5 false true false false 262000000 262 false false false xbrli:monetaryItemType monetary Aggregate carrying amount, as of the balance sheet date, of current obligations not separately disclosed in the balance sheet due to materiality considerations. Current liabilities are expected to be paid within one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 3 -Section A -Paragraph 8 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 6 -Paragraph 15 true 122 2 us-gaap_LiabilitiesCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 237000000 237 false false false 2 false false false false 0 0 false false false 3 false true false false 237000000 237 false false false 4 false false false false 0 0 false false false 5 false true false false 504000000 504 false false false xbrli:monetaryItemType monetary Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H false 126 2 us-gaap_DeferredTaxLiabilitiesNoncurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -1000000 -1 false false false 2 false false false false 0 0 false false false 3 false true false false -1000000 -1 false false false 4 false false false false 0 0 false false false 5 false true false false -4000000 -4 false false false xbrli:monetaryItemType monetary Represents the noncurrent portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A noncurrent taxable temporary difference is a difference between the tax basis and the carrying amount of a noncurrent asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. In a classified statement of financial position, an enterprise shall separate deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets shall be classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, shall be classified according to the expected reversal date of the temporary difference. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 24 -Article 5 true 129 2 us-gaap_Liabilities us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 17651000000 17651 false false false 2 false false false false 0 0 false false false 3 false true false false 17651000000 17651 false false false 4 false false false false 0 0 false false false 5 false true false false 15621000000 15621 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. 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No authoritative reference available. false 146 2 us-gaap_ProceedsFromIssuanceOfCommonStock 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 35000000 35 false false false 4 false true false false -21000000 -21 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash inflow from the additional capital contribution to the entity. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 155 0 na true na na No definition available. false true false false false false false false false false false http://conocophillips.com/role/financialinformationdetails 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 5 false false false false 0 0 false false false false 11 USD true false false false ConocoPhillips Company [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_SubsidiariesMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 12 USD true false false false ConocoPhillips Company [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_SubsidiariesMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 13 USD true false false false ConocoPhillips Company [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_SubsidiariesMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 14 USD true false false false ConocoPhillips Company [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_SubsidiariesMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 15 USD true false false false ConocoPhillips Company [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_SubsidiariesMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 156 2 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 5 false false false false 0 0 false false false xbrli:stringItemType string Revenues and Other Income. false 157 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 false true false false 29414000000 29414 false false false 2 false true false false 21922000000 21922 false false false 3 false true false false 57336000000 57336 false false false 4 false true false false 39456000000 39456 false false false 5 false false false false 0 0 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. 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No authoritative reference available. true 162 2 cop_TotalRevenuesAndOtherIncome cop false credit duration Aggregate revenue recognized during the period, including Other Income and Equity in Earnings of Affiliates. false false false false false false false false false false false totallabel false 1 false true false false 34320000000 34320 false false false 2 false true false false 23374000000 23374 false false false 3 false true false false 64915000000 64915 false false false 4 false true false false 42408000000 42408 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Aggregate revenue recognized during the period, including Other Income and Equity in Earnings of Affiliates. No authoritative reference available. true 163 2 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 5 false false false false 0 0 false false false xbrli:stringItemType string Costs and Expenses. false 164 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 26239000000 26239 false false false 2 false true false false 19297000000 19297 false false false 3 false true false false 51366000000 51366 false false false 4 false true false false 34138000000 34138 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Cost of oil and gas purchased during the reporting period. 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No authoritative reference available. false 166 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 294000000 294 false false false 2 false true false false 309000000 309 false false false 3 false true false false 616000000 616 false false false 4 false true false false 632000000 632 false false false 5 false false false false 0 0 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 171 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 16000000 16 false false false 2 false true false false 19000000 19 false false false 3 false true false false 31000000 31 false false false 4 false true false false 37000000 37 false false false 5 false false false false 0 0 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 172 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 235000000 235 false false false 2 false true false false 16000000 16 false false false 3 false true false false 248000000 248 false false false 4 false true false false 85000000 85 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Interest and debt related expenses associated with nonoperating financing activities of the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 false 173 2 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax us-gaap true credit duration No definition available. false false false false false false false false false false true negatedtotal false 1 false true false false 5000000 5 false false false 2 false true false false -50000000 -50 false false false 3 false true false false 35000000 35 false false false 4 false true false false -43000000 -43 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate foreign currency transaction gain or loss (both realized and unrealized) included in determining net income for the reporting period. 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 30 true 174 2 cop_TotalCostsAndExpenses cop false debit duration Total costs and expenses, including operating expenses and non-operating expenses. false false false false false false false false false false false totallabel false 1 false true false false 29704000000 29704 false false false 2 false true false false 22389000000 22389 false false false 3 false true false false 57988000000 57988 false false false 4 false true false false 40381000000 40381 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Total costs and expenses, including operating expenses and non-operating expenses. No authoritative reference available. true 175 2 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 4616000000 4616 false false false 2 false true false false 985000000 985 false false false 3 false true false false 6927000000 6927 false false false 4 false true false false 2027000000 2027 false false false 5 false false false false 0 0 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. No authoritative reference available. false 176 2 us-gaap_IncomeTaxExpenseBenefit 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 311000000 311 false false false 2 false true false false 37000000 37 false false false 3 false true false false 390000000 390 false false false 4 false true false false 190000000 190 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b true 177 2 us-gaap_ProfitLoss 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 4305000000 4305 false false false 2 false true false false 948000000 948 false false false 3 false true false false 6537000000 6537 false false false 4 false true false false 1837000000 1837 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) false 179 2 us-gaap_NetIncomeLoss 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 4305000000 4305 false false false 2 false true false false 948000000 948 false false false 3 false true false false 6537000000 6537 false false false 4 false true false false 1837000000 1837 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 true 180 2 us-gaap_AssetsAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 181 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 664000000 664 false false false 2 false true false false 132000000 132 false false false 3 false true false false 664000000 664 false false false 4 false true false false 132000000 132 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 false 182 2 us-gaap_ReceivablesNetCurrent us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 7220000000 7220 false false false 2 false false false false 0 0 false false false 3 false true false false 7220000000 7220 false false false 4 false false false false 0 0 false false false 5 false true false false 6495000000 6495 false false false xbrli:monetaryItemType monetary The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a -Article 5 false 183 2 us-gaap_InventoryNet us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 4104000000 4104 false false false 2 false false false false 0 0 false false false 3 false true false false 4104000000 4104 false false false 4 false false false false 0 0 false false false 5 false true false false 2911000000 2911 false false false xbrli:monetaryItemType monetary Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer). No authoritative reference available. false 185 2 cop_PrepaidExpensesAndOtherCurrentAssets cop false debit instant Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of... false false false false false false false false false false false totallabel false 1 false true false false 880000000 880 false false false 2 false false false false 0 0 false false false 3 false true false false 880000000 880 false false false 4 false false false false 0 0 false false false 5 false true false false 835000000 835 false false false xbrli:monetaryItemType monetary Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer. Also included is the aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet due to materiality considerations. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer.) No authoritative reference available. true 186 2 us-gaap_AssetsCurrent us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 12868000000 12868 false false false 2 false false false false 0 0 false false false 3 false true false false 12868000000 12868 false false false 4 false false false false 0 0 false false false 5 false true false false 10363000000 10363 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 9 -Article 5 false 187 2 cop_InvestmentsAndLongTermReceivablesIncludingLoansAndAdvancesRelatedParties cop false debit instant Investments and long-term receivables including Loans and advances-related parties. false false false false false false false false false false false verboselabel false 1 false true false false 97578000000 97578 [3] false false false 2 false false false false 0 0 false false false 3 false true false false 97578000000 97578 [3] false false false 4 false false false false 0 0 false false false 5 false true false false 91643000000 91643 [3] false false false xbrli:monetaryItemType monetary Investments and long-term receivables including Loans and advances-related parties. No authoritative reference available. false 188 2 us-gaap_PropertyPlantAndEquipmentNet us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 19421000000 19421 false false false 2 false false false false 0 0 false false false 3 false true false false 19421000000 19421 false false false 4 false false false false 0 0 false false false 5 false true false false 19838000000 19838 false false false xbrli:monetaryItemType monetary 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; net of accumulated depreciation. Examples include land, buildings, and production equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 12 -Paragraph 5 -Subparagraph b, c Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 false 189 2 us-gaap_Goodwill us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 3638000000 3638 false false false 2 false false false false 0 0 false false false 3 false true false false 3638000000 3638 false false false 4 false false false false 0 0 false false false 5 false true false false 3638000000 3638 false false false xbrli:monetaryItemType monetary Carrying amount as of the balance sheet date, which is the cumulative amount paid, adjusted for any amortization recognized prior to adoption of FAS 142 and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 43 false 190 2 us-gaap_IntangibleAssetsNetExcludingGoodwill us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 764000000 764 false false false 2 false false false false 0 0 false false false 3 false true false false 764000000 764 false false false 4 false false false false 0 0 false false false 5 false true false false 770000000 770 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 42, 45 false 191 2 us-gaap_OtherAssetsNoncurrent us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 262000000 262 false false false 2 false false false false 0 0 false false false 3 false true false false 262000000 262 false false false 4 false false false false 0 0 false false false 5 false true false false 240000000 240 false false false xbrli:monetaryItemType monetary Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet due to materiality considerations. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 true 192 2 us-gaap_Assets us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 134531000000 134531 false false false 2 false false false false 0 0 false false false 3 false true false false 134531000000 134531 false false false 4 false false false false 0 0 false false false 5 false true false false 126492000000 126492 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 25 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 true 193 2 us-gaap_LiabilitiesAndStockholdersEquityAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 194 2 us-gaap_AccountsPayableCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 13513000000 13513 false false false 2 false false false false 0 0 false false false 3 false true false false 13513000000 13513 false false false 4 false false false false 0 0 false false false 5 false true false false 11590000000 11590 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 false 195 2 us-gaap_DebtCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 351000000 351 false false false 2 false false false false 0 0 false false false 3 false true false false 351000000 351 false false false 4 false false false false 0 0 false false false 5 false true false false 1286000000 1286 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of the sum of short-term debt and current maturities of long-term debt and capital lease obligations, which are due within one year (or one business cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 false 196 2 us-gaap_TaxesPayableCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 386000000 386 false false false 2 false false false false 0 0 false false false 3 false true false false 386000000 386 false false false 4 false false false false 0 0 false false false 5 false true false false 298000000 298 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5 false 197 2 cop_EmployeeBenefitObligationsCurrent cop false credit instant Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for... false false false false false false false false false false false verboselabel false 1 false true false false 465000000 465 false false false 2 false false false false 0 0 false false false 3 false true false false 465000000 465 false false false 4 false false false false 0 0 false false false 5 false true false false 588000000 588 false false false xbrli:monetaryItemType monetary Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses. For classified balance sheets, used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer); for unclassified balance sheets, used to reflect the total liabilities (regardless of due date). No authoritative reference available. false 198 2 us-gaap_OtherLiabilitiesCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 598000000 598 false false false 2 false false false false 0 0 false false false 3 false true false false 598000000 598 false false false 4 false false false false 0 0 false false false 5 false true false false 643000000 643 false false false xbrli:monetaryItemType monetary Aggregate carrying amount, as of the balance sheet date, of current obligations not separately disclosed in the balance sheet due to materiality considerations. Current liabilities are expected to be paid within one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 3 -Section A -Paragraph 8 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 6 -Paragraph 15 true 199 2 us-gaap_LiabilitiesCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 15313000000 15313 false false false 2 false false false false 0 0 false false false 3 false true false false 15313000000 15313 false false false 4 false false false false 0 0 false false false 5 false true false false 14405000000 14405 false false false xbrli:monetaryItemType monetary Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 21 -Article 5 false 200 2 us-gaap_LongTermDebtAndCapitalLeaseObligations us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 3702000000 3702 false false false 2 false false false false 0 0 false false false 3 false true false false 3702000000 3702 false false false 4 false false false false 0 0 false false false 5 false true false false 4053000000 4053 false false false xbrli:monetaryItemType monetary Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H false 201 2 cop_AssetRetirementObligationsAndAccruedEnvironmentalCosts cop false credit instant Non current portion of the carrying amount of a liability for an asset retirement obligation, as well as the carrying value... false false false false false false false false false false false label false 1 false true false false 1400000000 1400 false false false 2 false false false false 0 0 false false false 3 false true false false 1400000000 1400 false false false 4 false false false false 0 0 false false false 5 false true false false 1406000000 1406 false false false xbrli:monetaryItemType monetary Non current portion of the carrying amount of a liability for an asset retirement obligation, as well as the carrying value of an obligation (known or estimated) arising from requirements to perform activities to remediate one of more sites, payable after twelve months or beyond the next operating cycle if longer. No authoritative reference available. false 203 2 us-gaap_DeferredTaxLiabilitiesNoncurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 3444000000 3444 false false false 2 false false false false 0 0 false false false 3 false true false false 3444000000 3444 false false false 4 false false false false 0 0 false false false 5 false true false false 2785000000 2785 false false false xbrli:monetaryItemType monetary Represents the noncurrent portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A noncurrent taxable temporary difference is a difference between the tax basis and the carrying amount of a noncurrent asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. In a classified statement of financial position, an enterprise shall separate deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets shall be classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, shall be classified according to the expected reversal date of the temporary difference. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 41, 42 false 204 2 cop_EmployeeBenefitObligationsNoncurrent cop false credit instant For classified balance sheets this represents the noncurrent liability for underfunded plans recognized in the balance sheet... false false false false false false false false false false false verboselabel false 1 false true false false 2914000000 2914 false false false 2 false false false false 0 0 false false false 3 false true false false 2914000000 2914 false false false 4 false false false false 0 0 false false false 5 false true false false 2960000000 2960 false false false xbrli:monetaryItemType monetary For classified balance sheets this represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit plans. No authoritative reference available. false 205 2 us-gaap_OtherLiabilitiesNoncurrent us-gaap true credit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 27328000000 27328 [3] false false false 2 false false false false 0 0 false false false 3 false true false false 27328000000 27328 [3] false false false 4 false false false false 0 0 false false false 5 false true false false 25819000000 25819 [3] false false false xbrli:monetaryItemType monetary Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet due to materiality considerations. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 24 -Article 5 true 206 2 us-gaap_Liabilities us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 54101000000 54101 false false false 2 false false false false 0 0 false false false 3 false true false false 54101000000 54101 false false false 4 false false false false 0 0 false false false 5 false true false false 51428000000 51428 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. No authoritative reference available. false 207 2 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 16144000000 16144 false false false 2 false false false false 0 0 false false false 3 false true false false 16144000000 16144 false false false 4 false false false false 0 0 false false false 5 false true false false 9607000000 9607 false false false xbrli:monetaryItemType monetary The cumulative amount of the reporting entity's undistributed earnings or deficit. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 32 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 25 -Article 7 false 211 2 us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities include all transactions and events that are not defined as investing or financing activities. Operating activities generally involve producing and delivering goods and providing services. Cash flows from operating activities are generally the cash effects of transactions and other events that enter into the determination of net income. false 212 2 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration No definition available. false false false false false false false false false false false terselabel 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 4090000000 4090 false false false 4 false true false false 5976000000 5976 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. 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 95 -Paragraph 26 false 213 2 us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 214 2 cop_CapitalExpendituresAndInvestments cop false credit duration Cash outflows for purchases of and capital improvements on property, plant and equipment (capital expenditures), software,... false false false false false false false false false false true negated 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 -853000000 -853 false false false 4 false true false false -1779000000 -1779 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Cash outflows for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets as well as net cash outflows associated with the acquisition of investments. 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No authoritative reference available. false 216 2 us-gaap_PaymentsForAdvanceToAffiliate us-gaap true credit duration No definition available. false false false false false false false false false false true negated 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 -335000000 -335 false false false 4 false true false false 11000000 11 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash outflow from advancing money to an affiliate (an entity that is related but not strictly controlled by the entity). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph a false 217 2 us-gaap_ProceedsFromCollectionOfAdvanceToAffiliate 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 71000000 71 false false false 4 false true false false 97000000 97 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash inflow from the collection of money previously advanced to an entity that is related to it but not strictly controlled. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 true 219 2 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel 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 -952000000 -952 false false false 4 false true false false -1773000000 -1773 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from investing activity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 false 220 2 us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 222 2 cop_RepaymentOfDebt cop false debit duration The cash outflow due to total repayments of additional borrowing. 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 -2629000000 -2629 false false false 4 false true false false -4081000000 -4081 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash outflow due to total repayments of additional borrowing. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18, 19, 20 true 227 2 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel 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 -2611000000 -2611 false false false 4 false true false false -4079000000 -4079 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from financing activity for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 228 2 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel 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 15000000 15 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The effect of exchange rate changes on cash balances held in foreign currencies. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 25 true 229 2 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na 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 542000000 542 false false false 4 false true false false 124000000 124 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net change between the beginning and ending balance of cash and cash equivalents. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 false 230 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false true false false periodstartlabel 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 122000000 122 false false false 4 false true false false 8000000 8 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. 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It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. 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No authoritative reference available. false 233 2 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 5 false false false false 0 0 false false false xbrli:stringItemType string Revenues and Other Income. false 238 2 cop_IntercompanyRevenues cop false credit duration Intercompany revenues. false false false false false false false false false false false totallabel false 1 false true false false 12000000 12 false false false 2 false true false false 12000000 12 false false false 3 false true false false 23000000 23 false false false 4 false true false false 29000000 29 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Intercompany revenues. No authoritative reference available. true 239 2 cop_TotalRevenuesAndOtherIncome cop false credit duration Aggregate revenue recognized during the period, including Other Income and Equity in Earnings of Affiliates. false false false false false false false false false false false totallabel false 1 false true false false 12000000 12 false false false 2 false true false false 12000000 12 false false false 3 false true false false 23000000 23 false false false 4 false true false false 29000000 29 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Aggregate revenue recognized during the period, including Other Income and Equity in Earnings of Affiliates. No authoritative reference available. true 240 2 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 5 false false false false 0 0 false false false xbrli:stringItemType string Costs and Expenses. false 249 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 11000000 11 false false false 2 false true false false 11000000 11 false false false 3 false true false false 21000000 21 false false false 4 false true false false 26000000 26 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Interest and debt related expenses associated with nonoperating financing activities of the entity. 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No authoritative reference available. true 252 2 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 1000000 1 false false false 2 false true false false 1000000 1 false false false 3 false true false false 2000000 2 false false false 4 false true false false 3000000 3 false false false 5 false false false false 0 0 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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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b true 254 2 us-gaap_ProfitLoss us-gaap true credit 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 true false false 1000000 1 false false false 3 false true false false 1000000 1 false false false 4 false true false false 2000000 2 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. 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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 true 269 2 us-gaap_Assets us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 762000000 762 false false false 2 false false false false 0 0 false false false 3 false true false false 762000000 762 false false false 4 false false false false 0 0 false false false 5 false true false false 760000000 760 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. 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Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 false 275 2 us-gaap_OtherLiabilitiesCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 9000000 9 false false false 2 false false false false 0 0 false false false 3 false true false false 9000000 9 false false false 4 false false false false 0 0 false false false 5 false true false false 9000000 9 false false false xbrli:monetaryItemType monetary Aggregate carrying amount, as of the balance sheet date, of current obligations not separately disclosed in the balance sheet due to materiality considerations. Current liabilities are expected to be paid within one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 3 -Section A -Paragraph 8 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 6 -Paragraph 15 true 276 2 us-gaap_LiabilitiesCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 10000000 10 false false false 2 false false false false 0 0 false false false 3 false true false false 10000000 10 false false false 4 false false false false 0 0 false false false 5 false true false false 9000000 9 false false false xbrli:monetaryItemType monetary Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 21 -Article 5 false 277 2 us-gaap_LongTermDebtAndCapitalLeaseObligations us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 749000000 749 false false false 2 false false false false 0 0 false false false 3 false true false false 749000000 749 false false false 4 false false false false 0 0 false false false 5 false true false false 749000000 749 false false false xbrli:monetaryItemType monetary Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H false 283 2 us-gaap_Liabilities us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 759000000 759 false false false 2 false false false false 0 0 false false false 3 false true false false 759000000 759 false false false 4 false false false false 0 0 false false false 5 false true false false 758000000 758 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. No authoritative reference available. false 284 2 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1000000 1 false false false 2 false false false false 0 0 false false false 3 false true false false 1000000 1 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 false 285 2 cop_OtherCommonStockholdersEquity cop false credit instant Other common stockholders' equity, excluding retained earnings and noncontrolling interest. false false false false false false false false false false false verboselabel false 1 false true false false 2000000 2 false false false 2 false false false false 0 0 false false false 3 false true false false 2000000 2 false false false 4 false false false false 0 0 false false false 5 false true false false 2000000 2 false false false xbrli:monetaryItemType monetary Other common stockholders' equity, excluding retained earnings and noncontrolling interest. No authoritative reference available. false 287 2 us-gaap_LiabilitiesAndStockholdersEquity us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 762000000 762 false false false 2 false false false false 0 0 false false false 3 false true false false 762000000 762 false false false 4 false false false false 0 0 false false false 5 false true false false 760000000 760 false false false xbrli:monetaryItemType monetary Total of all Liabilities and Stockholders' Equity items. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 32 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 25 -Article 7 false 290 2 us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 294 2 us-gaap_ProceedsFromCollectionOfAdvanceToAffiliate 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 false false false 0 0 false false false 4 false true false false 950000000 950 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash inflow from the collection of money previously advanced to an entity that is related to it but not strictly controlled. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph a false 296 2 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel 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 true false false 950000000 950 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from investing activity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 false 297 2 us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 299 2 cop_RepaymentOfDebt cop false debit duration The cash outflow due to total repayments of additional borrowing. 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 false false false 4 false true false false -950000000 -950 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash outflow due to total repayments of additional borrowing. No authoritative reference available. false 304 2 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel 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 true false false -950000000 -950 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from financing activity for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 309 0 na true na na No definition available. false true false false false false false false false false false http://conocophillips.com/role/financialinformationdetails 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 5 false false false false 0 0 false false false false 21 USD true false false false ConocoPhillips Canada Funding Company I [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi cop_SubsidiariesCompanyTwoMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 22 USD true false false false ConocoPhillips Canada Funding Company I [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi cop_SubsidiariesCompanyTwoMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 23 USD true false false false ConocoPhillips Canada Funding Company I [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi cop_SubsidiariesCompanyTwoMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 24 USD true false false false ConocoPhillips Canada Funding Company I [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi cop_SubsidiariesCompanyTwoMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 25 USD true false false false ConocoPhillips Canada Funding Company I [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi cop_SubsidiariesCompanyTwoMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 310 2 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 5 false false false false 0 0 false false false xbrli:stringItemType string Revenues and Other Income. false 315 2 cop_IntercompanyRevenues cop false credit duration Intercompany revenues. false false false false false false false false false false false totallabel false 1 false true false false 22000000 22 false false false 2 false true false false 19000000 19 false false false 3 false true false false 43000000 43 false false false 4 false true false false 37000000 37 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Intercompany revenues. No authoritative reference available. true 316 2 cop_TotalRevenuesAndOtherIncome cop false credit duration Aggregate revenue recognized during the period, including Other Income and Equity in Earnings of Affiliates. false false false false false false false false false false false totallabel false 1 false true false false 22000000 22 false false false 2 false true false false 19000000 19 false false false 3 false true false false 43000000 43 false false false 4 false true false false 37000000 37 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Aggregate revenue recognized during the period, including Other Income and Equity in Earnings of Affiliates. No authoritative reference available. true 317 2 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 5 false false false false 0 0 false false false xbrli:stringItemType string Costs and Expenses. false 320 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 false false false 0 0 false false false 2 false true false false -1000000 -1 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 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. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 4 -Paragraph 5A false 326 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 20000000 20 false false false 2 false true false false 20000000 20 false false false 3 false true false false 39000000 39 false false false 4 false true false false 39000000 39 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Interest and debt related expenses associated with nonoperating financing activities of the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 false 327 2 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax us-gaap true credit duration No definition available. false false false false false false false false false false true negatedtotal false 1 false true false false -86000000 -86 false false false 2 false true false false 93000000 93 false false false 3 false true false false -55000000 -55 false false false 4 false true false false 55000000 55 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate foreign currency transaction gain or loss (both realized and unrealized) included in determining net income for the reporting period. 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 30 true 328 2 cop_TotalCostsAndExpenses cop false debit duration Total costs and expenses, including operating expenses and non-operating expenses. false false false false false false false false false false false totallabel false 1 false true false false -66000000 -66 false false false 2 false true false false 112000000 112 false false false 3 false true false false -16000000 -16 false false false 4 false true false false 94000000 94 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Total costs and expenses, including operating expenses and non-operating expenses. No authoritative reference available. true 329 2 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 88000000 88 false false false 2 false true false false -93000000 -93 false false false 3 false true false false 59000000 59 false false false 4 false true false false -57000000 -57 false false false 5 false false false false 0 0 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. No authoritative reference available. false 330 2 us-gaap_IncomeTaxExpenseBenefit 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 10000000 10 false false false 2 false true false false 1000000 1 false false false 3 false true false false 13000000 13 false false false 4 false true false false 2000000 2 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b true 331 2 us-gaap_ProfitLoss 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 78000000 78 false false false 2 false true false false -94000000 -94 false false false 3 false true false false 46000000 46 false false false 4 false true false false -59000000 -59 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) false 333 2 us-gaap_NetIncomeLoss 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 78000000 78 false false false 2 false true false false -94000000 -94 false false false 3 false true false false 46000000 46 false false false 4 false true false false -59000000 -59 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 true 334 2 us-gaap_AssetsAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 335 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 23000000 23 false false false 2 false true false false 14000000 14 false false false 3 false true false false 23000000 23 false false false 4 false true false false 14000000 14 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 false 338 2 us-gaap_ShortTermInvestments 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 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 5 false true false false 2973000000 2973 false false false xbrli:monetaryItemType monetary Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 false 339 2 cop_PrepaidExpensesAndOtherCurrentAssets cop false debit instant Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of... false false false false false false false false false false false totallabel false 1 false true false false 1000000 1 false false false 2 false false false false 0 0 false false false 3 false true false false 1000000 1 false false false 4 false false false false 0 0 false false false 5 false true false false 4000000 4 false false false xbrli:monetaryItemType monetary Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer. Also included is the aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet due to materiality considerations. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer.) No authoritative reference available. true 340 2 us-gaap_AssetsCurrent us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 24000000 24 false false false 2 false false false false 0 0 false false false 3 false true false false 24000000 24 false false false 4 false false false false 0 0 false false false 5 false true false false 2995000000 2995 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 9 -Article 5 false 341 2 cop_InvestmentsAndLongTermReceivablesIncludingLoansAndAdvancesRelatedParties cop false debit instant Investments and long-term receivables including Loans and advances-related parties. false false false false false false false false false false false verboselabel false 1 false true false false 1366000000 1366 [3] false false false 2 false false false false 0 0 false false false 3 false true false false 1366000000 1366 [3] false false false 4 false false false false 0 0 false false false 5 false true false false 1376000000 1376 [3] false false false xbrli:monetaryItemType monetary Investments and long-term receivables including Loans and advances-related parties. No authoritative reference available. false 345 2 us-gaap_OtherAssetsNoncurrent us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 3000000 3 false false false 2 false false false false 0 0 false false false 3 false true false false 3000000 3 false false false 4 false false false false 0 0 false false false 5 false true false false 3000000 3 false false false xbrli:monetaryItemType monetary Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet due to materiality considerations. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 true 346 2 us-gaap_Assets us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 1393000000 1393 false false false 2 false false false false 0 0 false false false 3 false true false false 1393000000 1393 false false false 4 false false false false 0 0 false false false 5 false true false false 4374000000 4374 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 25 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 true 347 2 us-gaap_LiabilitiesAndStockholdersEquityAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 348 2 us-gaap_AccountsPayableCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 2000000 2 false false false 2 false false false false 0 0 false false false 3 false true false false 2000000 2 false false false 4 false false false false 0 0 false false false 5 false true false false 1000000 1 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 false 349 2 us-gaap_DebtCurrent us-gaap true credit instant 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 false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 2973000000 2973 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of the sum of short-term debt and current maturities of long-term debt and capital lease obligations, which are due within one year (or one business cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 false 350 2 us-gaap_TaxesPayableCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -1000000 -1 false false false 2 false false false false 0 0 false false false 3 false true false false -1000000 -1 false false false 4 false false false false 0 0 false false false 5 false true false false -1000000 -1 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5 false 352 2 us-gaap_OtherLiabilitiesCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 15000000 15 false false false 2 false false false false 0 0 false false false 3 false true false false 15000000 15 false false false 4 false false false false 0 0 false false false 5 false true false false 15000000 15 false false false xbrli:monetaryItemType monetary Aggregate carrying amount, as of the balance sheet date, of current obligations not separately disclosed in the balance sheet due to materiality considerations. Current liabilities are expected to be paid within one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 3 -Section A -Paragraph 8 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 6 -Paragraph 15 true 353 2 us-gaap_LiabilitiesCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 16000000 16 false false false 2 false false false false 0 0 false false false 3 false true false false 16000000 16 false false false 4 false false false false 0 0 false false false 5 false true false false 2988000000 2988 false false false xbrli:monetaryItemType monetary Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 21 -Article 5 false 354 2 us-gaap_LongTermDebtAndCapitalLeaseObligations us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1250000000 1250 false false false 2 false false false false 0 0 false false false 3 false true false false 1250000000 1250 false false false 4 false false false false 0 0 false false false 5 false true false false 1250000000 1250 false false false xbrli:monetaryItemType monetary Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H false 357 2 us-gaap_DeferredTaxLiabilitiesNoncurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 22000000 22 false false false 2 false false false false 0 0 false false false 3 false true false false 22000000 22 false false false 4 false false false false 0 0 false false false 5 false true false false 10000000 10 false false false xbrli:monetaryItemType monetary Represents the noncurrent portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A noncurrent taxable temporary difference is a difference between the tax basis and the carrying amount of a noncurrent asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. In a classified statement of financial position, an enterprise shall separate deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets shall be classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, shall be classified according to the expected reversal date of the temporary difference. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 41, 42 false 359 2 us-gaap_OtherLiabilitiesNoncurrent us-gaap true credit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 10000000 10 [3] false false false 2 false false false false 0 0 false false false 3 false true false false 10000000 10 [3] false false false 4 false false false false 0 0 false false false 5 false true false false 68000000 68 [3] false false false xbrli:monetaryItemType monetary Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet due to materiality considerations. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 24 -Article 5 true 360 2 us-gaap_Liabilities us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1298000000 1298 false false false 2 false false false false 0 0 false false false 3 false true false false 1298000000 1298 false false false 4 false false false false 0 0 false false false 5 false true false false 4316000000 4316 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. No authoritative reference available. false 361 2 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -3000000 -3 false false false 2 false false false false 0 0 false false false 3 false true false false -3000000 -3 false false false 4 false false false false 0 0 false false false 5 false true false false -49000000 -49 false false false xbrli:monetaryItemType monetary The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 false 362 2 cop_OtherCommonStockholdersEquity cop false credit instant Other common stockholders' equity, excluding retained earnings and noncontrolling interest. false false false false false false false false false false false verboselabel false 1 false true false false 98000000 98 false false false 2 false false false false 0 0 false false false 3 false true false false 98000000 98 false false false 4 false false false false 0 0 false false false 5 false true false false 107000000 107 false false false xbrli:monetaryItemType monetary Other common stockholders' equity, excluding retained earnings and noncontrolling interest. No authoritative reference available. false 364 2 us-gaap_LiabilitiesAndStockholdersEquity us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1393000000 1393 false false false 2 false false false false 0 0 false false false 3 false true false false 1393000000 1393 false false false 4 false false false false 0 0 false false false 5 false true false false 4374000000 4374 false false false xbrli:monetaryItemType monetary Total of all Liabilities and Stockholders' Equity items. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 32 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 25 -Article 7 false 365 2 us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities include all transactions and events that are not defined as investing or financing activities. Operating activities generally involve producing and delivering goods and providing services. Cash flows from operating activities are generally the cash effects of transactions and other events that enter into the determination of net income. false 366 2 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration No definition available. false false false false false false false false false false false terselabel 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 5000000 5 false false false 4 false true false false 4000000 4 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. 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 95 -Paragraph 26 false 374 2 us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 383 2 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na 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 5000000 5 false false false 4 false true false false 4000000 4 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net change between the beginning and ending balance of cash and cash equivalents. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 false 384 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false true false false periodstartlabel 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 18000000 18 false false false 4 false true false false 10000000 10 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 false 385 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false false true false periodendlabel false 1 false true false false 23000000 23 false false false 2 false true false false 14000000 14 false false false 3 false true false false 23000000 23 false false false 4 false true false false 14000000 14 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 false 386 0 na true na na No definition available. false true false false false false false false false false false http://conocophillips.com/role/financialinformationdetails 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 5 false false false false 0 0 false false false false 26 USD true false false false ConocoPhillips Canada Funding Company II [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi cop_SubsidiariesCompanyThreeMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 27 USD true false false false ConocoPhillips Canada Funding Company II [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi cop_SubsidiariesCompanyThreeMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 28 USD true false false false ConocoPhillips Canada Funding Company II [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi cop_SubsidiariesCompanyThreeMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 29 USD true false false false ConocoPhillips Canada Funding Company II [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi cop_SubsidiariesCompanyThreeMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 30 USD true false false false ConocoPhillips Canada Funding Company II [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi cop_SubsidiariesCompanyThreeMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 387 2 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 5 false false false false 0 0 false false false xbrli:stringItemType string Revenues and Other Income. false 392 2 cop_IntercompanyRevenues cop false credit duration Intercompany revenues. false false false false false false false false false false false totallabel false 1 false true false false 37000000 37 false false false 2 false true false false 12000000 12 false false false 3 false true false false 50000000 50 false false false 4 false true false false 23000000 23 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Intercompany revenues. No authoritative reference available. true 393 2 cop_TotalRevenuesAndOtherIncome cop false credit duration Aggregate revenue recognized during the period, including Other Income and Equity in Earnings of Affiliates. false false false false false false false false false false false totallabel false 1 false true false false 37000000 37 false false false 2 false true false false 12000000 12 false false false 3 false true false false 50000000 50 false false false 4 false true false false 23000000 23 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Aggregate revenue recognized during the period, including Other Income and Equity in Earnings of Affiliates. No authoritative reference available. true 394 2 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 5 false false false false 0 0 false false false xbrli:stringItemType string Costs and Expenses. false 397 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 false false false 0 0 false false false 2 false true false false -1000000 -1 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 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. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 4 -Paragraph 5A false 403 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 14000000 14 false false false 2 false true false false 14000000 14 false false false 3 false true false false 27000000 27 false false false 4 false true false false 27000000 27 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Interest and debt related expenses associated with nonoperating financing activities of the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 false 404 2 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax us-gaap true credit duration No definition available. false false false false false false false false false false true negatedtotal false 1 false true false false -102000000 -102 false false false 2 false true false false 116000000 116 false false false 3 false true false false -53000000 -53 false false false 4 false true false false 109000000 109 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate foreign currency transaction gain or loss (both realized and unrealized) included in determining net income for the reporting period. 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 30 true 405 2 cop_TotalCostsAndExpenses cop false debit duration Total costs and expenses, including operating expenses and non-operating expenses. false false false false false false false false false false false totallabel false 1 false true false false -88000000 -88 false false false 2 false true false false 129000000 129 false false false 3 false true false false -26000000 -26 false false false 4 false true false false 136000000 136 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Total costs and expenses, including operating expenses and non-operating expenses. No authoritative reference available. true 406 2 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 125000000 125 false false false 2 false true false false -117000000 -117 false false false 3 false true false false 76000000 76 false false false 4 false true false false -113000000 -113 false false false 5 false false false false 0 0 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. No authoritative reference available. false 407 2 us-gaap_IncomeTaxExpenseBenefit 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 25000000 25 false false false 2 false true false false -13000000 -13 false false false 3 false true false false 20000000 20 false false false 4 false true false false -17000000 -17 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b true 408 2 us-gaap_ProfitLoss 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 100000000 100 false false false 2 false true false false -104000000 -104 false false false 3 false true false false 56000000 56 false false false 4 false true false false -96000000 -96 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. 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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 true 411 2 us-gaap_AssetsAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 412 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 412000000 412 false false false 2 false true false false 1000000 1 false false false 3 false true false false 412000000 412 false false false 4 false true false false 1000000 1 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. 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Also included is the aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet due to materiality considerations. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer.) No authoritative reference available. true 417 2 us-gaap_AssetsCurrent us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 413000000 413 false false false 2 false false false false 0 0 false false false 3 false true false false 413000000 413 false false false 4 false false false false 0 0 false false false 5 false true false false 4000000 4 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 9 -Article 5 false 418 2 cop_InvestmentsAndLongTermReceivablesIncludingLoansAndAdvancesRelatedParties cop false debit instant Investments and long-term receivables including Loans and advances-related parties. false false false false false false false false false false false verboselabel false 1 false true false false 563000000 563 [3] false false false 2 false false false false 0 0 false false false 3 false true false false 563000000 563 [3] false false false 4 false false false false 0 0 false false false 5 false true false false 933000000 933 [3] false false false xbrli:monetaryItemType monetary Investments and long-term receivables including Loans and advances-related parties. 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Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 false 426 2 us-gaap_DebtCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 350000000 350 false false false 2 false false false false 0 0 false false false 3 false true false false 350000000 350 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of the sum of short-term debt and current maturities of long-term debt and capital lease obligations, which are due within one year (or one business cycle if longer). 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It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. 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No authoritative reference available. false 464 2 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 5 false false false false 0 0 false false false xbrli:stringItemType string Revenues and Other Income. false 465 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 false true false false 16272000000 16272 false false false 2 false true false false 13526000000 13526 false false false 3 false true false false 33171000000 33171 false false false 4 false true false false 26733000000 26733 false false false 5 false false false false 0 0 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 466 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 995000000 995 false false false 2 false true false false 289000000 289 false false false 3 false true false false 1673000000 1673 false false false 4 false true false false 528000000 528 false false false 5 false false false false 0 0 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 467 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 2890000000 2890 false false false 2 false false false false 0 0 false false false 3 false true false false 2890000000 2890 false false false 4 false false false false 0 0 false false false 5 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 468 2 us-gaap_OtherNonoperatingIncome 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 432000000 432 false false false 2 false true false false -11000000 -11 false false false 3 false true false false 419000000 419 false false false 4 false true false false -88000000 -88 false false false 5 false false false false 0 0 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 80 -Subparagraph Exhibit 4-4 -IssueDate 2006-05-01 false 469 2 cop_IntercompanyRevenues cop false credit duration Intercompany revenues. false false false false false false false false false false false totallabel false 1 false true false false 7411000000 7411 false false false 2 false true false false 3969000000 3969 false false false 3 false true false false 12881000000 12881 false false false 4 false true false false 7473000000 7473 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Intercompany revenues. No authoritative reference available. true 470 2 cop_TotalRevenuesAndOtherIncome cop false credit duration Aggregate revenue recognized during the period, including Other Income and Equity in Earnings of Affiliates. false false false false false false false false false false false totallabel false 1 false true false false 28000000000 28000 false false false 2 false true false false 17773000000 17773 false false false 3 false true false false 51034000000 51034 false false false 4 false true false false 34646000000 34646 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Aggregate revenue recognized during the period, including Other Income and Equity in Earnings of Affiliates. No authoritative reference available. true 471 2 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 5 false false false false 0 0 false false false xbrli:stringItemType string Costs and Expenses. false 472 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 13061000000 13061 false false false 2 false true false false 9349000000 9349 false false false 3 false true false false 25012000000 25012 false false false 4 false true false false 17936000000 17936 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Cost of oil and gas purchased during the reporting period. No authoritative reference available. false 473 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 1558000000 1558 false false false 2 false true false false 1478000000 1478 false false false 3 false true false false 3008000000 3008 false false false 4 false true false false 2953000000 2953 false false false 5 false false false false 0 0 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 474 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 160000000 160 false false false 2 false true false false 167000000 167 false false false 3 false true false false 285000000 285 false false false 4 false true false false 324000000 324 false false false 5 false false false false 0 0 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. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 4 -Paragraph 5A false 475 2 us-gaap_ExplorationExpense 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 157000000 157 false false false 2 false true false false 192000000 192 false false false 3 false true false false 499000000 499 false false false 4 false true false false 352000000 352 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph a -Subparagraph 15 -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-OGP -Chapter 2 -Paragraph 48 -IssueDate 2006-05-01 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 17 false 476 2 us-gaap_DepreciationDepletionAndAmortization 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 1883000000 1883 false false false 2 false true false false 1932000000 1932 false false false 3 false true false false 3782000000 3782 false false false 4 false true false false 3737000000 3737 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. No authoritative reference available. false 477 2 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 false true false false 1518000000 1518 false false false 2 false true false false 51000000 51 false false false 3 false true false false 1606000000 1606 false false false 4 false true false false 59000000 59 false false false 5 false false false false 0 0 false 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 478 2 cop_TaxesOtherThanIncomeTaxes cop false debit duration Taxes other than income taxes, if not included elsewhere, that could include, payroll tax, property tax or other selling and... false false false false false false false false false false false verboselabel false 1 false true false false 2883000000 2883 false false false 2 false true false false 2504000000 2504 false false false 3 false true false false 5711000000 5711 false false false 4 false true false false 4831000000 4831 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Taxes other than income taxes, if not included elsewhere, that could include, payroll tax, property tax or other selling and distribution-related taxes. Also includes excise taxes. No authoritative reference available. false 479 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 97000000 97 false false false 2 false true false false 89000000 89 false false false 3 false true false false 196000000 196 false false false 4 false true false false 175000000 175 false false false 5 false false false false 0 0 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 480 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 90000000 90 false false false 2 false true false false 239000000 239 false false false 3 false true false false 324000000 324 false false false 4 false true false false 513000000 513 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Interest and debt related expenses associated with nonoperating financing activities of the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 false 481 2 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax us-gaap true credit duration No definition available. false false false false false false false false false false true negatedtotal false 1 false true false false 237000000 237 false false false 2 false true false false -301000000 -301 false false false 3 false true false false 163000000 163 false false false 4 false true false false -132000000 -132 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate foreign currency transaction gain or loss (both realized and unrealized) included in determining net income for the reporting period. 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 30 true 482 2 cop_TotalCostsAndExpenses cop false debit duration Total costs and expenses, including operating expenses and non-operating expenses. false false false false false false false false false false false totallabel false 1 false true false false 21644000000 21644 false false false 2 false true false false 15700000000 15700 false false false 3 false true false false 40586000000 40586 false false false 4 false true false false 30748000000 30748 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Total costs and expenses, including operating expenses and non-operating expenses. No authoritative reference available. true 483 2 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 6356000000 6356 false false false 2 false true false false 2073000000 2073 false false false 3 false true false false 10448000000 10448 false false false 4 false true false false 3898000000 3898 false false false 5 false false false false 0 0 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. No authoritative reference available. false 484 2 us-gaap_IncomeTaxExpenseBenefit 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 1740000000 1740 false false false 2 false true false false 1087000000 1087 false false false 3 false true false false 3613000000 3613 false false false 4 false true false false 2159000000 2159 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b true 485 2 us-gaap_ProfitLoss 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 4616000000 4616 false false false 2 false true false false 986000000 986 false false false 3 false true false false 6835000000 6835 false false false 4 false true false false 1739000000 1739 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) false 486 2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest us-gaap true debit duration No definition available. false false false false false false false false false false true negatedtotal false 1 false true false false -19000000 -19 false false false 2 false true false false -16000000 -16 false false false 3 false true false false -33000000 -33 false false false 4 false true false false -32000000 -32 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The portion of net income (loss) attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 true 487 2 us-gaap_NetIncomeLoss 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 4597000000 4597 false false false 2 false true false false 970000000 970 false false false 3 false true false false 6802000000 6802 false false false 4 false true false false 1707000000 1707 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 true 488 2 us-gaap_AssetsAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 489 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 6025000000 6025 false false false 2 false true false false 741000000 741 false false false 3 false true false false 6025000000 6025 false false false 4 false true false false 741000000 741 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a -Article 5 false 491 2 us-gaap_InventoryNet us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 3015000000 3015 false false false 2 false false false false 0 0 false false false 3 false true false false 3015000000 3015 false false false 4 false false false false 0 0 false false false 5 false true false false 2029000000 2029 false false false xbrli:monetaryItemType monetary Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer). No authoritative reference available. false 493 2 cop_PrepaidExpensesAndOtherCurrentAssets cop false debit instant Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of... false false false false false false false false false false false totallabel false 1 false true false false 1330000000 1330 false false false 2 false false false false 0 0 false false false 3 false true false false 1330000000 1330 false false false 4 false false false false 0 0 false false false 5 false true false false 1621000000 1621 false false false xbrli:monetaryItemType monetary Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer. Also included is the aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet due to materiality considerations. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer.) No authoritative reference available. true 494 2 us-gaap_AssetsCurrent us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 22314000000 22314 false false false 2 false false false false 0 0 false false false 3 false true false false 22314000000 22314 false false false 4 false false false false 0 0 false false false 5 false true false false 17916000000 17916 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 9 -Article 5 false 495 2 cop_InvestmentsAndLongTermReceivablesIncludingLoansAndAdvancesRelatedParties cop false debit instant Investments and long-term receivables including Loans and advances-related parties. false false false false false false false false false false false verboselabel false 1 false true false false 46475000000 46475 [3] false false false 2 false false false false 0 0 false false false 3 false true false false 46475000000 46475 [3] false false false 4 false false false false 0 0 false false false 5 false true false false 47886000000 47886 [3] false false false xbrli:monetaryItemType monetary Investments and long-term receivables including Loans and advances-related parties. No authoritative reference available. false 496 2 us-gaap_PropertyPlantAndEquipmentNet us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 61848000000 61848 false false false 2 false false false false 0 0 false false false 3 false true false false 61848000000 61848 false false false 4 false false false false 0 0 false false false 5 false true false false 67870000000 67870 false false false xbrli:monetaryItemType monetary 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; net of accumulated depreciation. Examples include land, buildings, and production equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 12 -Paragraph 5 -Subparagraph b, c Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 false 498 2 us-gaap_IntangibleAssetsNetExcludingGoodwill us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 44000000 44 false false false 2 false false false false 0 0 false false false 3 false true false false 44000000 44 false false false 4 false false false false 0 0 false false false 5 false true false false 53000000 53 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 42, 45 false 499 2 us-gaap_OtherAssetsNoncurrent us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 396000000 396 false false false 2 false false false false 0 0 false false false 3 false true false false 396000000 396 false false false 4 false false false false 0 0 false false false 5 false true false false 509000000 509 false false false xbrli:monetaryItemType monetary Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet due to materiality considerations. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 true 500 2 us-gaap_Assets us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 131077000000 131077 false false false 2 false false false false 0 0 false false false 3 false true false false 131077000000 131077 false false false 4 false false false false 0 0 false false false 5 false true false false 134234000000 134234 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 25 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 true 501 2 us-gaap_LiabilitiesAndStockholdersEquityAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 502 2 us-gaap_AccountsPayableCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 7850000000 7850 false false false 2 false false false false 0 0 false false false 3 false true false false 7850000000 7850 false false false 4 false false false false 0 0 false false false 5 false true false false 10904000000 10904 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 false 503 2 us-gaap_DebtCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 2386000000 2386 false false false 2 false false false false 0 0 false false false 3 false true false false 2386000000 2386 false false false 4 false false false false 0 0 false false false 5 false true false false 207000000 207 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of the sum of short-term debt and current maturities of long-term debt and capital lease obligations, which are due within one year (or one business cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 false 504 2 us-gaap_TaxesPayableCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 4116000000 4116 false false false 2 false false false false 0 0 false false false 3 false true false false 4116000000 4116 false false false 4 false false false false 0 0 false false false 5 false true false false 3105000000 3105 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5 false 505 2 cop_EmployeeBenefitObligationsCurrent cop false credit instant Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for... false false false false false false false false false false false verboselabel false 1 false true false false 202000000 202 false false false 2 false false false false 0 0 false false false 3 false true false false 202000000 202 false false false 4 false false false false 0 0 false false false 5 false true false false 258000000 258 false false false xbrli:monetaryItemType monetary Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses. For classified balance sheets, used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer); for unclassified balance sheets, used to reflect the total liabilities (regardless of due date). No authoritative reference available. false 506 2 us-gaap_OtherLiabilitiesCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 1162000000 1162 false false false 2 false false false false 0 0 false false false 3 false true false false 1162000000 1162 false false false 4 false false false false 0 0 false false false 5 false true false false 1301000000 1301 false false false xbrli:monetaryItemType monetary Aggregate carrying amount, as of the balance sheet date, of current obligations not separately disclosed in the balance sheet due to materiality considerations. Current liabilities are expected to be paid within one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 3 -Section A -Paragraph 8 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 6 -Paragraph 15 true 507 2 us-gaap_LiabilitiesCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 15716000000 15716 false false false 2 false false false false 0 0 false false false 3 false true false false 15716000000 15716 false false false 4 false false false false 0 0 false false false 5 false true false false 15775000000 15775 false false false xbrli:monetaryItemType monetary Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 21 -Article 5 false 508 2 us-gaap_LongTermDebtAndCapitalLeaseObligations us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 5169000000 5169 false false false 2 false false false false 0 0 false false false 3 false true false false 5169000000 5169 false false false 4 false false false false 0 0 false false false 5 false true false false 7463000000 7463 false false false xbrli:monetaryItemType monetary Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H false 509 2 cop_AssetRetirementObligationsAndAccruedEnvironmentalCosts cop false credit instant Non current portion of the carrying amount of a liability for an asset retirement obligation, as well as the carrying value... false false false false false false false false false false false label false 1 false true false false 6989000000 6989 false false false 2 false false false false 0 0 false false false 3 false true false false 6989000000 6989 false false false 4 false false false false 0 0 false false false 5 false true false false 7307000000 7307 false false false xbrli:monetaryItemType monetary Non current portion of the carrying amount of a liability for an asset retirement obligation, as well as the carrying value of an obligation (known or estimated) arising from requirements to perform activities to remediate one of more sites, payable after twelve months or beyond the next operating cycle if longer. No authoritative reference available. false 510 2 us-gaap_DueToRelatedPartiesNoncurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 4666000000 4666 false false false 2 false false false false 0 0 false false false 3 false true false false 4666000000 4666 false false false 4 false false false false 0 0 false false false 5 false true false false 5009000000 5009 false false false xbrli:monetaryItemType monetary Portion of the carrying amount as of the balance sheet date of obligations due all related parties that is payable after one year or beyond the normal operating cycle if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 57 -Paragraph 2 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 23 -Article 5 false 511 2 us-gaap_DeferredTaxLiabilitiesNoncurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 13524000000 13524 false false false 2 false false false false 0 0 false false false 3 false true false false 13524000000 13524 false false false 4 false false false false 0 0 false false false 5 false true false false 15155000000 15155 false false false xbrli:monetaryItemType monetary Represents the noncurrent portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A noncurrent taxable temporary difference is a difference between the tax basis and the carrying amount of a noncurrent asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. In a classified statement of financial position, an enterprise shall separate deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets shall be classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, shall be classified according to the expected reversal date of the temporary difference. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 41, 42 false 512 2 cop_EmployeeBenefitObligationsNoncurrent cop false credit instant For classified balance sheets this represents the noncurrent liability for underfunded plans recognized in the balance sheet... false false false false false false false false false false false verboselabel false 1 false true false false 922000000 922 false false false 2 false false false false 0 0 false false false 3 false true false false 922000000 922 false false false 4 false false false false 0 0 false false false 5 false true false false 1170000000 1170 false false false xbrli:monetaryItemType monetary For classified balance sheets this represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit plans. No authoritative reference available. false 513 2 us-gaap_OtherLiabilitiesNoncurrent us-gaap true credit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 16753000000 16753 [3] false false false 2 false false false false 0 0 false false false 3 false true false false 16753000000 16753 [3] false false false 4 false false false false 0 0 false false false 5 false true false false 17296000000 17296 [3] false false false xbrli:monetaryItemType monetary Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet due to materiality considerations. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 24 -Article 5 true 514 2 us-gaap_Liabilities us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 63739000000 63739 false false false 2 false false false false 0 0 false false false 3 false true false false 63739000000 63739 false false false 4 false false false false 0 0 false false false 5 false true false false 69175000000 69175 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. No authoritative reference available. false 515 2 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 16155000000 16155 false false false 2 false false false false 0 0 false false false 3 false true false false 16155000000 16155 false false false 4 false false false false 0 0 false false false 5 false true false false 10240000000 10240 false false false xbrli:monetaryItemType monetary The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 false 516 2 cop_OtherCommonStockholdersEquity cop false credit instant Other common stockholders' equity, excluding retained earnings and noncontrolling interest. false false false false false false false false false false false verboselabel false 1 false true false false 50609000000 50609 false false false 2 false false false false 0 0 false false false 3 false true false false 50609000000 50609 false false false 4 false false false false 0 0 false false false 5 false true false false 54229000000 54229 false false false xbrli:monetaryItemType monetary Other common stockholders' equity, excluding retained earnings and noncontrolling interest. No authoritative reference available. false 517 2 us-gaap_MinorityInterest us-gaap true credit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 574000000 574 false false false 2 false false false false 0 0 false false false 3 false true false false 574000000 574 false false false 4 false false false false 0 0 false false false 5 false true false false 590000000 590 false false false xbrli:monetaryItemType monetary Total of all Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 27 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 26 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A3 -Appendix A true 518 2 us-gaap_LiabilitiesAndStockholdersEquity us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 131077000000 131077 false false false 2 false false false false 0 0 false false false 3 false true false false 131077000000 131077 false false false 4 false false false false 0 0 false false false 5 false true false false 134234000000 134234 false false false xbrli:monetaryItemType monetary Total of all Liabilities and Stockholders' Equity items. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 32 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 25 -Article 7 false 519 2 us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities include all transactions and events that are not defined as investing or financing activities. Operating activities generally involve producing and delivering goods and providing services. Cash flows from operating activities are generally the cash effects of transactions and other events that enter into the determination of net income. false 520 2 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration No definition available. false false false false false false false false false false false terselabel 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 3227000000 3227 false false false 4 false true false false 5669000000 5669 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. 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 95 -Paragraph 26 false 521 2 us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 522 2 cop_CapitalExpendituresAndInvestments cop false credit duration Cash outflows for purchases of and capital improvements on property, plant and equipment (capital expenditures), software,... false false false false false false false false false false true negated 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 -3549000000 -3549 false false false 4 false true false false -4035000000 -4035 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Cash outflows for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets as well as net cash outflows associated with the acquisition of investments. No authoritative reference available. false 523 2 cop_ProceedsFromAssetDispositions cop false debit duration Cash inflows from disposals of property, plant and equipment (property dispositions) as well as net cash inflows associated... 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 5877000000 5877 false false false 4 false true false false 227000000 227 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Cash inflows from disposals of property, plant and equipment (property dispositions) as well as net cash inflows associated with the sale of investments. No authoritative reference available. false 524 2 us-gaap_PaymentsForAdvanceToAffiliate us-gaap true credit duration No definition available. false false false false false false false false false false true negated 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 -66000000 -66 false false false 4 false true false false -136000000 -136 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash outflow from advancing money to an affiliate (an entity that is related but not strictly controlled by the entity). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph a false 525 2 us-gaap_ProceedsFromCollectionOfAdvanceToAffiliate 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 1363000000 1363 false false false 4 false true false false 3783000000 3783 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash inflow from the collection of money previously advanced to an entity that is related to it but not strictly controlled. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph a false 526 2 us-gaap_PaymentsForProceedsFromOtherInvestingActivities us-gaap true credit duration No definition available. false false false false false false false false false false true negatedtotal 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 9000000 9 false false false 4 false true false false 30000000 30 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net cash outflow (inflow) from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 true 527 2 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel 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 3634000000 3634 false false false 4 false true false false -131000000 -131 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from investing activity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 false 528 2 us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 529 2 cop_IssuanceOfDebt cop false debit duration The cash inflow due to total proceeds from additional borrowings. 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 197000000 197 false false false 4 false true false false 123000000 123 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash inflow due to total proceeds from additional borrowings. No authoritative reference available. false 530 2 cop_RepaymentOfDebt cop false debit duration The cash outflow due to total repayments of additional borrowing. 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 -554000000 -554 false false false 4 false true false false -3763000000 -3763 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash outflow due to total repayments of additional borrowing. No authoritative reference available. false 533 2 us-gaap_PaymentsOfDividendsCommonStock us-gaap true credit duration No definition available. false false false false false false false false false false true negated 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 -889000000 -889 false false false 4 false true false false -1871000000 -1871 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash outflow from the distribution of an entity's earnings in the form of dividends to common shareholders. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a false 534 2 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel 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 -149000000 -149 false false false 4 false true false false -125000000 -125 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18, 19, 20 true 535 2 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel 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 -1395000000 -1395 false false false 4 false true false false -5636000000 -5636 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from financing activity for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 536 2 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel 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 5000000 5 false false false 4 false true false false 89000000 89 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The effect of exchange rate changes on cash balances held in foreign currencies. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 false 538 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false true false false periodstartlabel 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 554000000 554 false false false 4 false true false false 750000000 750 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. 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It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. 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No authoritative reference available. false 541 2 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 5 false false false false 0 0 false false false xbrli:stringItemType string Revenues and Other Income. false 543 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 -9080000000 -9080 false false false 2 false true false false -1721000000 -1721 false false false 3 false true false false -13442000000 -13442 false false false 4 false true false false -3391000000 -3391 false false false 5 false false false false 0 0 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. 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No authoritative reference available. true 547 2 cop_TotalRevenuesAndOtherIncome cop false credit duration Aggregate revenue recognized during the period, including Other Income and Equity in Earnings of Affiliates. false false false false false false false false false false false totallabel false 1 false true false false -16571000000 -16571 false false false 2 false true false false -5968000000 -5968 false false false 3 false true false false -26716000000 -26716 false false false 4 false true false false -11571000000 -11571 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Aggregate revenue recognized during the period, including Other Income and Equity in Earnings of Affiliates. No authoritative reference available. true 548 2 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 5 false false false false 0 0 false false false xbrli:stringItemType string Costs and Expenses. false 549 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 -7212000000 -7212 false false false 2 false true false false -4037000000 -4037 false false false 3 false true false false -12769000000 -12769 false false false 4 false true false false -7706000000 -7706 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Cost of oil and gas purchased during the reporting period. No authoritative reference available. false 550 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 -23000000 -23 false false false 2 false true false false -25000000 -25 false false false 3 false true false false -51000000 -51 false false false 4 false true false false -51000000 -51 false false false 5 false false false false 0 0 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 551 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 -19000000 -19 false false false 2 false true false false -3000000 -3 false false false 3 false true false false -26000000 -26 false false false 4 false true false false -13000000 -13 false false false 5 false false false false 0 0 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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No authoritative reference available. true 560 2 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 -9080000000 -9080 false false false 2 false true false false -1721000000 -1721 false false false 3 false true false false -13442000000 -13442 false false false 4 false true false false -3391000000 -3391 false false false 5 false false false false 0 0 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. No authoritative reference available. false 562 2 us-gaap_ProfitLoss 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 -9080000000 -9080 false false false 2 false true false false -1721000000 -1721 false false false 3 false true false false -13442000000 -13442 false false false 4 false true false false -3391000000 -3391 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) false 564 2 us-gaap_NetIncomeLoss 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 -9080000000 -9080 false false false 2 false true false false -1721000000 -1721 false false false 3 false true false false -13442000000 -13442 false false false 4 false true false false -3391000000 -3391 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 true 565 2 us-gaap_AssetsAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 566 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -3004000000 -3004 false false false 2 false false false false 0 0 false false false 3 false true false false -3004000000 -3004 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a -Article 5 false 569 2 us-gaap_ShortTermInvestments 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 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 5 false true false false -2973000000 -2973 false false false xbrli:monetaryItemType monetary Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 9 -Article 5 false 572 2 cop_InvestmentsAndLongTermReceivablesIncludingLoansAndAdvancesRelatedParties cop false debit instant Investments and long-term receivables including Loans and advances-related parties. false false false false false false false false false false false verboselabel false 1 false true false false -184513000000 -184513 [3] false false false 2 false false false false 0 0 false false false 3 false true false false -184513000000 -184513 [3] false false false 4 false false false false 0 0 false false false 5 false true false false -175272000000 -175272 [3] false false false xbrli:monetaryItemType monetary Investments and long-term receivables including Loans and advances-related parties. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 true 577 2 us-gaap_Assets us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false -193508000000 -193508 false false false 2 false false false false 0 0 false false false 3 false true false false -193508000000 -193508 false false false 4 false false false false 0 0 false false false 5 false true false false -185526000000 -185526 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. 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Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 false 580 2 us-gaap_DebtCurrent us-gaap true credit instant 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 false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false -2973000000 -2973 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of the sum of short-term debt and current maturities of long-term debt and capital lease obligations, which are due within one year (or one business cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 false 583 2 us-gaap_OtherLiabilitiesCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false totallabel 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 5 false true false false -6000000 -6 false false false xbrli:monetaryItemType monetary Aggregate carrying amount, as of the balance sheet date, of current obligations not separately disclosed in the balance sheet due to materiality considerations. Current liabilities are expected to be paid within one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 3 -Section A -Paragraph 8 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 6 -Paragraph 15 true 584 2 us-gaap_LiabilitiesCurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -5991000000 -5991 false false false 2 false false false false 0 0 false false false 3 false true false false -5991000000 -5991 false false false 4 false false false false 0 0 false false false 5 false true false false -9997000000 -9997 false false false xbrli:monetaryItemType monetary Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 21 -Article 5 false 590 2 us-gaap_OtherLiabilitiesNoncurrent us-gaap true credit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false -46935000000 -46935 [3] false false false 2 false false false false 0 0 false false false 3 false true false false -46935000000 -46935 [3] false false false 4 false false false false 0 0 false false false 5 false true false false -42683000000 -42683 [3] false false false xbrli:monetaryItemType monetary Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet due to materiality considerations. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 24 -Article 5 true 591 2 us-gaap_Liabilities us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -52926000000 -52926 false false false 2 false false false false 0 0 false false false 3 false true false false -52926000000 -52926 false false false 4 false false false false 0 0 false false false 5 false true false false -52680000000 -52680 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. No authoritative reference available. false 592 2 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -25822000000 -25822 false false false 2 false false false false 0 0 false false false 3 false true false false -25822000000 -25822 false false false 4 false false false false 0 0 false false false 5 false true false false -13268000000 -13268 false false false xbrli:monetaryItemType monetary The cumulative amount of the reporting entity's undistributed earnings or deficit. 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No authoritative reference available. false 595 2 us-gaap_LiabilitiesAndStockholdersEquity us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -193508000000 -193508 false false false 2 false false false false 0 0 false false false 3 false true false false -193508000000 -193508 false false false 4 false false false false 0 0 false false false 5 false true false false -185526000000 -185526 false false false xbrli:monetaryItemType monetary Total of all Liabilities and Stockholders' Equity items. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 32 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 25 -Article 7 false 596 2 us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. 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Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. 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No authoritative reference available. false 600 2 cop_ProceedsFromAssetDispositions cop false debit duration Cash inflows from disposals of property, plant and equipment (property dispositions) as well as net cash inflows associated... 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 -99000000 -99 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Cash inflows from disposals of property, plant and equipment (property dispositions) as well as net cash inflows associated with the sale of investments. No authoritative reference available. false 601 2 us-gaap_PaymentsForAdvanceToAffiliate us-gaap true credit duration No definition available. false false false false false false false false false false true negated 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 132000000 132 false false false 4 false true false false 4000000 4 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash outflow from advancing money to an affiliate (an entity that is related but not strictly controlled by the entity). 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 false 605 2 us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract 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 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 606 2 cop_IssuanceOfDebt cop false debit duration The cash inflow due to total proceeds from additional borrowings. 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 -132000000 -132 false false false 4 false true false false -4000000 -4 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash inflow due to total proceeds from additional borrowings. No authoritative reference available. false 607 2 cop_RepaymentOfDebt cop false debit duration The cash outflow due to total repayments of additional borrowing. 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 1738000000 1738 false false false 4 false true false false 4794000000 4794 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash outflow due to total repayments of additional borrowing. No authoritative reference available. false 610 2 us-gaap_PaymentsOfDividendsCommonStock us-gaap true credit duration No definition available. false false false false false false false false false false true negated 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 889000000 889 false false false 4 false true false false 1871000000 1871 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash outflow from the distribution of an entity's earnings in the form of dividends to common shareholders. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a false 611 2 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel 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 -223000000 -223 false false false 4 false true false false -236000000 -236 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 614 2 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na 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 -2851000000 -2851 false false false 4 false true false false 14000000 14 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net change between the beginning and ending balance of cash and cash equivalents. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 false 615 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false true false false periodstartlabel 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 -153000000 -153 false false false 4 false true false false -14000000 -14 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. 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It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 false 1 Includes excise taxes on petroleum products sales of $3,417 million and $3,316 million for the three months ended June 30, 2010 and June 30, 2009 respectively; $6,637 million and $6,376 million for six months ended June 30, 2010 and June 30, 2009, respectively. 2 Recast to reflect a change in accounting principle. See Note 2-Changes in Accounting Principles, for more information. 3 Includes intercompany loans. 5 423 false Millions UnKnown UnKnown false true