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Debentures Unsecured Debt [Member] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] 1 to 90 days Remaining Maturities 1 to 90 Days [Member] Maturities between one and ninety days. Proceeds from sale of business Proceeds from Sales of Business, Affiliate and Productive Assets Increase (decrease) in accounts payable Increase (Decrease) in Accounts Payable Excise tax on share repurchases Share Repurchase Program, Excise Tax Share Repurchase Program, Excise Tax 5.9% Notes due 2032 5.9% Notes due 2032 [Member] 5.9% Notes due 2032 Reconciliation of Unrecognized Tax Benefits Summary of Income Tax Contingencies [Table Text Block] Valuation Allowance by Deferred Tax Asset [Axis] Valuation Allowance by Deferred Tax Asset [Axis] Income Taxes Information [Table] Income Taxes Information [Table] Income Taxes Information [Table] Non-core assets, measurement input Non-Core Assets, Measurement Input Non-Core Assets, Measurement Input Entity Public Float Entity Public Float Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Terms of financial instruments and trade receivables Credit Derivative, Term Aging of Capitalized Exploratory Well Costs [Axis] Aging of Capitalized Exploratory Well Costs [Axis] Derivative Instrument [Axis] Derivative Instrument [Axis] Increase (decrease) in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount All Trading Arrangements All Trading Arrangements [Member] Before-tax gain (loss) on disposition Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Less: Accumulated depreciation, depletion and amortization Less: Accumulated depreciation, depletion and amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization All Adjustments to Compensation All Adjustments to Compensation [Member] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Defined Contribution Plan Company Retirement Contribution Defined Contribution Plan Company Retirement Contribution [Member] Supplemental Unemployment Benefits [Abstract] Supplemental Unemployment Benefits [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Total Assets Reconciliation of Assets from Segment to Consolidated [Table Text Block] Equity securities, shares sold (in shares) Equity Securities, FV-NI , Shares Sold Equity Securities, FV-NI , Shares Sold Commodity derivatives Derivative Asset Weighted-Average Grant Date Fair Value, Forfeited/Settled/Cancelled (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Deferred taxes Deferred Income Tax Expense (Benefit) Cash received from exercise of stock options Proceeds from Stock Options Exercised Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Income (loss) before income taxes, Percent of Pre-Tax Income (Loss) Income (Loss) Before Income Taxes In Percent Income (Loss) from continuing operations before income taxes in percent. Investments In and Advances To Affiliates Schedule of Investments in and Advances to Affiliates, Schedule of Investments [Table Text Block] 4.025% Notes due 2062 4.025% Note due 2062 [Member] 4.025% Note due 2062 Canada and Lower 48 Canada and Lower 48 [Member] Canada and Lower 48 [Member] Finance leases Total lease liabilities Finance Lease, Liability Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] Stock Units, Forfeited/Settled/Cancelled (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Employer matching contribution, percent of employee's gross pay Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Accumulated benefit obligation Defined Benefit Plan, Accumulated Benefit Obligation Income (loss) before income taxes Income (Loss) Attributable to Parent, before Tax Interest crediting rate for applicable benefits Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate Long-term debt, excluding finance lease obligations, 2024 Long-Term Debt, Maturity, Year One Accrued environmental costs Accrual for Environmental Loss Contingencies, Gross Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] PSU Cash Settled and Stock Settled PSU Cash Settled and Stock Settled [Member] PSU Cash Settled and Stock Settled Changes in Asset Retirement Obligation Schedule of Change in Asset Retirement Obligation [Table Text Block] Collection of advances/loans—related parties Proceeds from Collection of Long-Term Loans to Related Parties Add: Dilutive impact of options and unvested non-participating RSU/PSUs Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Taxes other than income taxes Taxes, Miscellaneous Total environmental accrual included in balance sheet Accrual for Environmental Loss Contingencies Unrealized gain on equity securities still held at the reporting date Equity Securities, FV-NI, Unrealized Gain (Loss) Acquisition of Concho Stock Issued During Period, Shares, Acquisitions Depreciation, Depletion, Amortization and Impairments Depreciation, Depletion, Amortization And Impairments [Table Text Block] Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Enhanced oil recovery credit, Percent of Pre-Tax Income (Loss) Effective Income Tax Rate Reconciliation, Tax Credit, Percent Schedule of Guarantor Obligations [Table] Schedule of Guarantor Obligations [Table] Benefit payments Payments for Restructuring Other accruals Other accruals Other Accruals [Member] Other accruals. Document Period End Date Document Period End Date 5.05% Note due 2033 5.05% Note due 2033 [Member] 5.05% Note due 2033 Adoption Date Trading Arrangement Adoption Date Sales and other operating revenues Sales [Member] Weighted-average discount rate, finance leases Finance Lease, Weighted Average Discount Rate, Percent Finance leases, noncurrent Finance Lease, Liability, Noncurrent Schedule of Supplemental Pro Forma Financial Information Business Acquisition, Pro Forma Information [Table Text Block] Treasury Stock Treasury Stock, Common [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Investment, ownership percentage Investment, Ownership Percentage Investment, Ownership Percentage Gain (loss) on dispositions (Gain) loss on dispositions Gain (Loss) on Disposition of Property Plant Equipment Joint Venture Obligation Guarantee Joint Venture Obligation Guarantee [Member] Joint Venture Obligation Guarantee Accounts and notes receivable (net of allowance of $3 and $2, respectively) Accounts and notes receivable—related parties Accounts and Financing Receivable, after Allowance for Credit Loss Income tax provision (benefit) Total tax provision (benefit) Consolidated income tax provision (benefit) Income Tax Expense (Benefit) Other foreign countries Non-US [Member] 6.5% Notes due 2039 6.5% Notes due 2039 [Member] 6.5% Notes due 2039 U.S. foreign tax credits Deferred Tax Assets, Tax Credit Carryforwards, Foreign Energy [Axis] Energy [Axis] Net PPE Finance Lease, Right-of-Use Asset, after Accumulated Amortization Exploration expenses Exploration Expenses [Member] Primary financial statement caption encompassing 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. 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Lower 48 Lower 48 Lower Forty Eight Segment [Member] The Lower 48 operating segment. Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Income (loss) before income taxes Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Components of Investments, Loans and Long-Term Receivables Schedule Of Long-Term Investments And Receivables [Table Text Block] Schedule Of Long-Term Investments And Receivables [Table Text Block] Number of note facilities Number of Note Facilities Number of Note Facilities Recognized net actuarial loss (gain) Defined Benefit Plan, Amortization of Gain (Loss) Alaska Alaska Alaska Segment [Member] The Alaska business operating segment of the entity. Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Demand Deposits Demand Deposits [Member] Business acquisition, threshold Business Acquisition, Contingent Consideration, Threshold Average Business Acquisition, Contingent Consideration, Threshold Average Acquisition of businesses, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Fair Value - Net PP&E (held for use) Property, Plant, and Equipment, Fair Value Disclosure VENEZUELA VENEZUELA Expected return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets 5.951% Notes serially maturing 2022 through 2037 5.951% Notes due 2022 through 2037 [Member] 5.951% Notes due 2022 through 2037 Credit Facility [Domain] Credit Facility [Domain] Net Carrying Amount of Investments and Long-term Receivables Carried at Cost plus Accrued Interest Debt Securities, Held-to-Maturity [Table Text Block] Treasury stock, shares acquired (in shares) Treasury Stock, Shares, Acquired Time Deposits Bank Time Deposits [Member] Assets - Amounts Subject to Right of Setoff, Net Amounts Presented Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Adjustment to valuation allowances, Percent of Pre-Tax Income (Loss) Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 7.65% Debentures due 2023 7.65% Debentures due 2023 [Member] 7.65% Debentures due 2023 2020-2022 Aging of Capitalized Exploratory Well Costs, Period One [Member] Omnibus Plan, General And Executive RSU Program Omnibus Plan, General And Executive RSU Program [Member] Omnibus Plan, General And Executive RSU Program Cash payment Increase (Decrease) in Commodity Contract Assets and Liabilities QatarEnergy QatarEnergy [Member] QatarEnergy [Member] Receivable in dispute Business Combination, Contingent Consideration, Receivable in Dispute Business Combination, Contingent Consideration, Receivable in Dispute Right-of-use assets obtained in exchange for finance lease liabilities Right-of-Use Asset Obtained in Exchange for Finance Lease Liability 5.9% Notes due 2038 5.9% Notes due 2038 [Member] 5.9% Notes due 2038 Asset Retirement Obligations and Accrued Environmental Cost Asset Retirement Obligation Disclosure [Text Block] Interest subsequently acquired Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage Less: portion representing imputed interest Finance Lease, Liability, Undiscounted Excess Amount Sales and Other Operating Revenues Revenue from Contract with Customer [Text Block] Income Tax Provision (Benefit) Segment Reporting Information, Income Taxes By Segment [Table Text Block] Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Settlements Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Capital in excess of par Additional Paid in Capital, Common Stock Capital in Excess of Par Additional Paid-in Capital [Member] Document Annual Report Document Annual Report Proceeds received from sale of equity securities Proceeds from Sale of Equity Securities, FV-NI Balance Sheet Location [Axis] Balance Sheet Location [Axis] Less: Net gain on equity securities sold during the period Equity Securities, FV-NI, Realized Gain (Loss) Capitalized Interest Costs Capitalized Adjustment Equity in earnings of affiliates Before-Tax Loss, Equity Method Investments Consolidated equity in earnings of affiliates Income (Loss) from Equity Method Investments Other liabilities and deferred credits Other Liabilities [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Cover [Abstract] Cover [Abstract] Position [Axis] Position [Axis] Recovery of outside basis Recovery of outside basis Tax benefit associated with operating losses in jurisdictions outside the US taken as a worthless security deduction. U.S. UNITED STATES Fair Value, Measurements, Recurring Fair Value, Recurring Fair Value, Recurring [Member] 2.4% Notes due 2031 2.4% Notes due 2031 [Member] 2.4% Notes due 2031 Other Deferred Tax Assets, Valuation Allowance, Other Number of projects with exploratory well costs capitalized for a period greater than one year Projects that have Exploratory Well Costs that have been Capitalized for Period Greater than One Year, Number of Projects Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Interest costs incurred Interest Costs Incurred Total Lessee, Operating Lease, Liability, to be Paid Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Short-term investments Short-Term Investments Asset acquisition, consideration transferred Asset Acquisition, Consideration Transferred Capitalized Interest Interest Expense, Policy [Policy Text Block] Finance lease cost, amortization of right-of-use-assets Finance Lease, Right-of-Use Asset, Amortization Segment Disclosures and Related Information Segment Reporting Disclosure [Text Block] Net Change in Cash, Cash Equivalents and Restricted Cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Income Tax Authority, Name [Domain] Income Tax Authority, Name [Domain] Natural gas Natural Gas [Member] Equity Component [Domain] Equity Component [Domain] Finance leases, current Finance Lease, Liability, Current Other, net Noninterest Income, Other Project [Axis] Project [Axis] Charged to expense (benefit) Deferred Tax Asset, Valuation Allowance, Charged To Expense Deferred Tax Asset, Valuation Allowance, Charged To Expense QatarEnergy LNG NFS(3) QatarEnergy LNG NFS(3) [Member] QatarEnergy LNG NFS(3) Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Minimum limit of debt for cross default provision Minimum Limit of Debt for Cross Default Provision Minimum limit of debt for cross default provision. Other Deferred Tax Liabilities, Other Entity Current Reporting Status Entity Current Reporting Status Concentration Risk Type [Domain] Concentration Risk Type [Domain] North Field South North Field South [Member] North Field South Rate of compensation increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Shipping and Handling Costs Shipping and Handling [Member] Total deferred tax liabilities Deferred Tax Liabilities, Gross Consolidated Entities [Domain] Consolidated Entities [Domain] Plan participant contributions Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant 3.35% Notes due 2024 3.35% Notes due 2024 [Member] 3.35% Notes due 2024 Concho Resources Inc. Concho Resources Inc. [Member] Concho Resources Inc. 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Corporate Defined Benefit Plan, Debt Security [Member] QatarEnergy LNG Limited Gurantee QatarEnergy LNG Limited Gurantee [Member] QatarEnergy LNG Limited Gurantee Curtailment loss (gain) Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment Issuance of company common stock Proceeds from Issuance of Common Stock Liabilities - Amounts Not Subject to Right of Setoff Derivative Liability, Not Subject to Master Netting Arrangement QatarEnergy LNG NFE(4) QatarEnergy LNG NFE(4) [Member] QatarEnergy LNG NFE(4) Geographical [Axis] Geographical [Axis] Crude oil and natural gas Energy Related Inventory, Crude Oil, Products and Merchandise PSUs, requisite period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period Int’l. Int’l. 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Measurement Basis [Axis] Measurement Basis [Axis] Asset Acquisition [Domain] Asset Acquisition [Domain] Underlying Securities Award Underlying Securities Amount Disposition Of Indonesia Entities Disposition Of Indonesia Entities [Member] Accumulated Other Comprehensive (Loss) Comprehensive Income (Loss) Note [Text Block] Working capital changes associated with investing activities Increase decrease in capital accrual Increase or decrease in capital accrual. Fair Value Measurement [Domain] Fair Value Measurement [Domain] Concho Resources Incorporated Concho Resources Incorporated [Member] Concho Resources Incorporated [Member] Adjustment to tax reserves Adjustment to tax reserves Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the reserve for deferred tax assets. Interest and penalties (benefiting) charging earnings Tax Adjustments, Settlements, and Unusual Provisions Other Other Debt [Member] Selling, general and administration expenses Selling, General and Administrative Expenses [Member] Dividends declared, ordinary (in dollars per share) Common Stock, Dividends, Per Share, Declared Unrealized holding gain (loss) on securities, net of tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Max Potential Future Payments-Prorata Share Max potential future payments-prorata share [Member] Max potential future payments-prorata share. 5.05% Notes due 2033 5.05% Notes due 2033 [Member] 5.05% Notes due 2033 Financial assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] 5.95% Notes due 2036 5.95% Notes due 2036 [Member] 5.95% Notes due 2036 Income Statement Location [Axis] Income Statement Location [Axis] Employee benefit obligations Noncurrent liabilities Liability, Defined Benefit Plan, Noncurrent 3.35% Debentures due 2025 3.35% Debentures due 2025 [Member] 3.35% Debentures due 2025 Asset Retirement Obligations and Environmental Costs Asset Retirement Obligation and Environmental Cost [Policy Text Block] Asset Retirement Obligation Disclosure [Abstract] Asset Retirement Obligation Disclosure [Abstract] Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax U.S. Government Agency Obligations US Government Corporations and Agencies Securities [Member] Site Contingency [Table] Site Contingency [Table] Maturity of Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] 6.95% Notes due 2029 6.95% Notes due 2029 [Member] 6.95% Notes due 2029 Disposal group, including discontinued operation, asset retirement obligation Disposal Group, Including Discontinued Operation, Asset Retirement Obligation Disposal Group, Including Discontinued Operation, Asset Retirement Obligation Change in Benefit Obligation Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Foreign Exchange Forward Foreign Exchange Forward [Member] Retained earnings, undistributed earnings of affiliated companies Retained Earnings, Undistributed Earnings from Equity Method Investees Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Undistributed earnings of foreign subsidiaries Undistributed Earnings of Foreign Subsidiaries Loss and credit carryforwards Deferred Tax Assets, Other Loss Carryforwards 2.4% Notes due 2022 2.4% Notes due 2022 [Member] 2.4% Notes due 2022 Schedule of Net Fair Value of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Product and Service [Domain] Product and Service [Domain] Business acquisition, term Business Combination, Contingent, Consideration Arrangements, Term Business Combination, Contingent, Consideration Arrangements, Term Other Performance Measure, Amount Other Performance Measure, Amount 7.2% Notes due 2031 7.2% Notes due 2031 [Member] 7.2% Notes due 2031 Lease Cost Lease, Cost [Table Text Block] Decrease (increase) in inventories Increase (Decrease) in Inventories Cash Flows From Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Property dispositions Asset Retirement Obligation, Liabilities Settled Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Income taxes on unrealized gain (loss) on hedging activities Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent Plan Name [Domain] Plan Name [Domain] Post Sixty Five Retiree Post Sixty Five Retiree [Member] Accrued environmental costs discounted Accrued Enviornmental Costs Discounted 3.8% Notes due 2052 3.8% Note due 2052 [Member] 3.8% Note due 2052 Non-Mineral Leases Leases Disclosure [Text Block] Recognized federal and state tax benefit Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount Asia Pacific Asia Pacific Asia Pacific Operating Segment [Member] Asia Pacific Operating Segment [Member] Share based compensation plan, number of shares authorized Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Trading Arrangement: Trading Arrangement [Axis] Crude oil Crude Oil [Member] Measurment input Business Combination, Contingent Consideration, Liability, Measurement Input Use of Estimates Use of Estimates, Policy [Policy Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Entity File Number Entity File Number Loss Contingencies [Table] Loss Contingencies [Table] Assets - Amounts Not Subject to Right of Setoff Derivative Asset, Not Subject to Master Netting Arrangement 7.375% Debentures due 2029 7.375% Debentures due 2029 [Member] 7.375% Debentures due 2029 Total Costs and Expenses Operating Expenses Including Nonoperating Income Expense And Interest And Debt Expense Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense, before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement as well as Interest and debt related expenses associated with nonoperating financing activities of the entity. Remaining years Lessee, Operating Lease, Liability, to be Paid, after Year Five Measurement Input, Discount Rate Measurement Input, Discount Rate [Member] Restricted Stock Unit Activity Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Long-term debt, excluding finance lease obligations, 2026 Long-Term Debt, Maturity, Year Three Net Unrealized Holding Gain/(Loss) on Securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Schedule of Available-for-sale Securities [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Reductions for tax positions of prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Auditor Firm ID Auditor Firm ID Entity Shell Company Entity Shell Company 7.4% Notes due 2031 7.4% Notes due 2031 [Member] 7.4% Notes due 2031 Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Restatement Determination Date Restatement Determination Date Revenue from contracts outside the scope of ASC Topic 606 Revenue Not from Contract with Customer Additions based on tax positions related to the current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Cash, cash equivalents and restricted cash at beginning of period Cash, Cash Equivalents and Restricted Cash at End of Period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Asset Class [Axis] Asset Class [Axis] Operating lease cost Operating Lease, Cost Impairment of Properties, Plants and Equipment Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Other Other Products [Member] Other products not separately disclosed by the entity. Common stock, shares issued (in shares) Beginning of year End of year Common Stock, Shares, Issued Stock Units, Issued (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Unrecognized net actuarial loss (gain) Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Gains and Losses Recorded in Other Income (Loss) Unrealized Gain (Loss) on Investments [Table Text Block] Previous Dispositions Previous Dispositions [Member] Previous Dispositions Total debt, excluding finance leases Long-Term Debt Total assets Fair Value Assets, Fair Value Disclosure Increase (decrease) in PP&E related to an increase (decrease) in asset retirement obligations Increase (Decrease) in Asset Retirement Obligations Cenovus Energy Inc Cenovus Energy Inc [Member] Cenovus Energy Inc. is an integrated oil company headquartered in Calgary, Alberta. Long-term debt, excluding finance lease obligations, 2027 Long-Term Debt, Maturity, Year Four Australia Pacific APLNG Australia Pacific APLNG [Member] Australia Pacific APLNG. Foreign Currency Translation Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Employer matching contribution, percent of match Defined Contribution Plan, Employer Matching Contribution, Percent of Match Several Louisiana parishes and the State of Louisiana against oil and gas companies Several Louisiana parishes and the State of Louisiana against oil and gas companies [Member] Several Louisiana parishes and the State of Louisiana have filed lawsuits under Louisiana's State and Local Coastal Resources Management Act (SLCRMA) against oil and gas companies, including ConocoPhillips. 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Net Income (Loss) attributable to ConocoPhillips Business Acquisition, Pro Forma Net Income (Loss) Total Revenues and Other Income Operating revenues and other income Revenues And Other Income Revenues And Other Income Number of investment options Number Of Investment Funds In Which Employee Can Contribute Number Of Investment Funds In Which Employee Can Contribute Distributed under benefit plans Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Federal statutory income tax Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Noncurrent assets Assets for Plan Benefits, Defined Benefit Plan Diluted earnings per share Earnings Per Share, Diluted [Abstract] Prior service credit (cost) arising during the period Prior service credit (cost) arising during the period Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax Equity Method Investments Carrying value of equity method investment Equity Method Investments Business acquisition, contingent payment term Business Acquisition, Contingent Consideration, Term Business Acquisition, Contingent Consideration, Term 4.3% Notes due 2044 4.3% Notes due 2044 [Member] 4.3% Notes due 2044 Inventories Total inventories Inventory, Net Other of $10 Million or less each Other Projects [Member] Other Projects [Member] After tax loss Gain (Loss) on Price Risk Derivative Instruments Not Designated as Hedging Instruments, After Tax Gain (Loss) on Price Risk Derivative Instruments Not Designated as Hedging Instruments, After Tax Net carrying value Disposal Group, Including Discontinued Operation, Net Carrying Value Disposal Group, Including Discontinued Operation, Net Carrying Value Participating interest in annuity contract, fair value Fair Value Of Participating Interest In Annuity Contract Fair Value Of Participating Interest In Annuity Contract Arithmetic Average Arithmetic Average [Member] 4.85% Notes due 2048 4.85% Notes due 2048 Two [Member] 4.85% Notes due 2048 Two Business combination, derivative liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Derivative Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Derivative Liabilities Financial Instrument [Axis] Financial Instrument [Axis] Interest crediting rate for applicable benefits Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate Fair value, equity method investments Investments in Affiliates, Subsidiaries, Associates, and Joint Ventures, Fair Value Disclosure Derivative, liability position, aggregate fair value Derivative, Net Liability Position, Aggregate Fair Value Schedule of Before-tax Impairment Charges Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block] Total Shareholder Return Amount Total Shareholder Return Amount Disposal group including discontinued operation, net carrying value, PP&E Disposal Group, Including Discontinued Operation, Property, Plant and Equipment Repurchase of company common stock Payments for Repurchase of Common Stock Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Pro Forma Pro Forma [Member] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Deferred Deferred Foreign Income Tax Expense (Benefit) Mitsui & Co., Ltd. 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