Dividends paid per common share (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Schedule of Notional Amounts of Outstanding Derivative Positions Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Crude oil (barrels) Crude Oil [Member] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Pension Benefits - Non-U.S. Foreign Plan [Member] Award Timing Predetermined Award Timing Predetermined [Flag] Entity File Number Entity File Number Revenue outside the scope of ASC 606 Revenue Not from Contract with Customer, Excluding Interest Income Tabular List, Table Tabular List [Table Text Block] Upstream Upstream [Member] Upstream Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Position [Axis] Position [Axis] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Measurement Basis [Axis] Measurement Basis [Axis] Earnings (loss) per common share, basic (in dollars per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Total other comprehensive income (loss) Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Disclosures about Segments and Related Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Adjustment to Compensation, Amount Adjustment to Compensation Amount Pension Plan Pension Plan [Member] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Proceeds from divestment activities Proceeds from Sale of Productive Assets Foreign exchange translation adjustment Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax ExxonMobil share of equity Equity, Attributable to Parent Amortization and settlement of postretirement benefits reserves adjustment included in net periodic benefit costs (Statement of Income line: Non-service pension and postretirement benefit expense) Defined Benefit Plan Amortization Of Actuarial Loss Gain And Prior Service Cost Credit And Recognized Net Gain Loss Due To Settlements And Curtailments Defined Benefit Plan Amortization Of Actuarial Loss/Gain And Prior Service Cost Credit And Recognized Net Gain/Loss Due To Settlements And Curtailments Other comprehensive income (net of income taxes) Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Common stock, shares authorized Common Stock, Shares Authorized Hedging Designation [Domain] Hedging Designation [Domain] Current assets Assets, Current [Abstract] Loss Contingency [Abstract] Loss Contingency [Abstract] Total Liabilities and Equity Liabilities and Equity Cover [Abstract] Cover [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Divestment Activities Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Additional investments and advances Additional Investments And Advances The cash outflow from investing in cost and equity method investments, advancing money to equity method affiliates and from long-term receivables. Net income (loss) attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Postretirement benefits reserves adjustment (excluding amortization) Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax Additions to property, plant and equipment Segment, Expenditure, Addition to Long-Lived Assets Crude oil and product purchases Crude oil and product purchases Purchase cost of crude oil, products and other raw materials, feedstocks, semi finished products, finished products and other merchandise that become part of salable products for oil and gas, refining and marketing and chemical operations. Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt instrument [Line Items] Debt Instrument [Line Items] Non-service pension and postretirement benefit expense Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component Common Stock Held in Treasury Treasury Stock, Common [Member] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Total change in accumulated other comprehensive income Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount LIABILITIES Liabilities [Abstract] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Net notional long / short position of derivative instruments bbl Derivative, Nonmonetary Notional Amount, Volume Income (loss) before income taxes Segment income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Long-term obligations Other Liabilities, Noncurrent Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Comprehensive income (loss) attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Comprehensive income (loss) attributable to ExxonMobil Comprehensive Income (Loss), Net of Tax, Attributable to Parent Name Measure Name Specialty Products Specialty Products [Member] Specialty Products Deferred income tax liabilities Deferred Income Tax Liabilities, Net Document Fiscal Period Focus Document Fiscal Period Focus Award Timing Method Award Timing Method [Text Block] Award Type Award Type [Axis] Exxon Mobil Corporation Share After Noncontrolling Interest Parent Company [Member] Total Assets Assets Trading Symbol Trading Symbol Materials and supplies Inventory, Parts and Components, Net of Reserves Beginning balance, postretirement benefits reserves adjustment Ending balance, postretirement benefits reserves adjustment Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Geographical [Domain] Geographical [Domain] Entity Address, City or Town Entity Address, City or Town Short-Term Debt, Type [Domain] Short-Term Debt, Type [Domain] 1.408% Notes due 2039 One Point Four Zero Eight Percent Notes Due 2039 [Member] One Point Four Zero Eight Percent Notes Due 2039 CASH FLOWS FROM OPERATING ACTIVITIES Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Effects of exchange rate changes on cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Emerging Growth Company Entity Emerging Growth Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Noncash right of use assets recorded in exchange for lease liabilities Lease, Cost [Abstract] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Investments in equity companies Equity Method Investments Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Related Party Related Party [Member] Balance (in shares) - outstanding Balance (in shares) - outstanding Common Stock, Shares, Outstanding Other long-term financial assets Other Assets, Fair Value Disclosure PEO PEO [Member] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Segment Reporting, Measurement Disclosures [Abstract] Segment Reporting, Measurement Disclosures [Abstract] Initial margin collateral receivable Accounts Receivable Exchange Collateral Accounts Receivable Exchange Collateral Income taxes payable Accrued Income Taxes, Current U.S. United States Pension Benefits - U.S. UNITED STATES Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Guarantees Guarantor Obligations, Current Carrying Value Earnings Reinvested Retained Earnings [Member] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Cash and cash equivalents at beginning of period (including restricted) Cash and cash equivalents at end of period (including restricted) Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Derivative assets Derivative Asset Income tax expense (benefit) Income Tax Expense (Benefit) Document information [Line Items] Document Information [Line Items] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Product and Service [Domain] Product and Service [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Amortization and settlement of postretirement benefits reserves adjustment included in net periodic benefit costs Amounts reclassified from accumulated other comprehensive income Other Comprehensive Income Postretirement Benefits Recognized In Net Periodic Pension Cost Net Of Tax The adjustment out of other comprehensive income for prior service costs, actuarial gains and losses and other previously recorded other comprehensive income recognized as a component of net period benefit cost during the period, after tax. ExxonMobil Share of Equity Parent [Member] Net income (loss) including noncontrolling interests Net income (loss) including noncontrolling interests Net income (loss) for the period Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Sales and other operating revenue Sales and other operating revenue Sales and Other Operating Revenue [Member] Sales and Other Operating Revenue Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] City Area Code City Area Code Dividends - common shares (total) Dividends Common Stock Inc Noncontrolling Int Dividends Common Stock Including Non Controlling Interests Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Commitments and Contingencies Commitments and Contingencies, Policy [Policy Text Block] CASH FLOWS FROM INVESTING ACTIVITIES Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Disposal Group, Disposed of by Sale Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Amortization of actuarial loss/(gain) Defined Benefit Plan, Amortization of Gain (Loss) Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Equity Components [Axis] Equity Components [Axis] Non-U.S. Non-US [Member] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of reportable segments Number of Reportable Segments Proceeds from hedge, financing activities Proceeds from Hedge, Financing Activities SUPPLEMENTAL DISCLOSURES Supplemental Cash Flow Information [Abstract] Exploration expenses, including dry holes Exploration Expense Dispositions Stock Issued During Period, Value, Treasury Stock Reissued Other Performance Measure, Amount Other Performance Measure, Amount Notes and loans payable Debt, Current Foreign exchange translation adjustment Current period change excluding amounts reclassified from accumulated other comprehensive income Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Entity Address State or Province Entity Address, State or Province Dividends - common shares (company) Dividends, Common Stock Related Party, Type [Domain] Related and Nonrelated Parties [Domain] Total current liabilities Liabilities, Current Derivative Instrument [Axis] Derivative Instrument [Axis] Other Comprehensive Income Information Before Tax [Abstract] Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Individual: Individual [Axis] Changes in operational working capital, excluding cash and debt Increase (Decrease) in Other Current Assets and Liabilities, Net Finance leases Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Cash dividends to ExxonMobil shareholders Payments of Ordinary Dividends, Common Stock Other current assets Other Assets, Current Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Included in cash flows from operating activities Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Other income Other Revenue [Member] Other Revenue Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Reductions in long-term debt Repayments of Long-Term Debt Entity Interactive Data Current Entity Interactive Data Current Net Carrying Value Reported Value Measurement [Member] Litigation and Other Contingencies Legal Matters and Contingencies [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Equity Company Obligations Equity Company Obligations [Member] Equity Company Obligations. Disclosures about Segments and Related Information Segment Reporting Disclosure [Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Net pension enhancement and curtailment/settlement cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Pension and Other Postretirement Benefits Schedule of Net Benefit Costs [Table Text Block] Changes in noncontrolling interests Proceeds from (Payments to) Noncontrolling Interests Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Other Comprehensive Income Information Comprehensive Income (Loss) Note [Text Block] Difference in Carrying Value and Fair Value Difference In Carrying Value And Fair Value [Member] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Selling, general and administrative expenses Selling, General and Administrative Expense Other investing activities including collection of advances Proceeds from Sale and Collection of Receivables Schedule of Accumulated Other Comprehensive Income Information Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Depreciation and depletion (includes impairments) Depreciation and depletion (includes impairments) Depreciation, Depletion and Amortization Other assets, including intangibles – net Other Assets, Noncurrent Entity Central Index Key Entity Central Index Key PEO Name PEO Name Beginning balance, cumulative foreign exchange translation adjustment Ending balance, cumulative foreign exchange translation adjustment Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Revenues Revenues Revenues Crude oil, products and merchandise Energy Related Inventory Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Fair value balance sheet grouping financial statement captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Financial Instruments and Derivatives Financial Instruments Disclosure [Text Block] Energy Products Energy Products [Member] Energy Products Segments [Axis] Segments [Axis] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Net notional long / short position of derivative instruments MMBtus Derivative, Nonmonetary Notional Amount, Energy Measure Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Common stock, without par value Common Stock, No Par Value All other items – net Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item Long Long [Member] ASSETS Assets [Abstract] Nonrelated Party Nonrelated Party [Member] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Pension and Other Postretirement Benefits Retirement Benefits [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Share repurchases, at cost (company) Treasury Stock, Value, Acquired, Cost Method Accumulated Other Comprehensive Income AOCI Attributable to Parent [Member] Amortization of prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Income statement, balance sheet and additional disclosures by disposal groups, including discontinued operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Entity Registrant Name Entity Registrant Name Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Net benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Other taxes and duties Taxes, Other Total costs and other deductions Total costs and other deductions Costs and Expenses Document Quarterly Report Document Quarterly Report Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Energy [Axis] Energy [Axis] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Not Designated as Hedging Instrument Not Designated as Hedging Instrument, Trading [Member] 0.524% Notes due 2028 Zero Point Five Two Four Percent Notes Due 2028 [Member] Zero Point Five Two Four Percent Notes Due 2028 Interest cost Defined Benefit Plan, Interest Cost Related Party, Type [Axis] Related and Nonrelated Parties [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Foreign exchange translation gain/(loss) included in net income (Statement of Income line: Other income) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax Restatement Determination Date: Restatement Determination Date [Axis] Non-PEO NEO Non-PEO NEO [Member] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Position [Domain] Position [Domain] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Amounts reclassified from accumulated other comprehensive income Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Segment reporting revenue reconciling item [Line Items] Segment Reporting, Revenue Reconciling Item [Line Items] Name Trading Arrangement, Individual Name All Award Types Award Type [Domain] Noncontrolling interests Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Reconciliation of Revenue from Segments to Consolidated [Table] Reconciliation of Revenue from Segments to Consolidated [Table] Share repurchases, at cost (total) Treasury Stock Including Non controlling interests Treasury Stock Including Non Controlling interests Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of revenue [Line Items] Disaggregation of Revenue [Line Items] Canada CANADA Compensation Amount Outstanding Recovery Compensation Amount Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Operating expenses, excl. depreciation and depletion Operating Costs and Expenses Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Other Third-Party Obligations Other Third Party Obligations [Member] Other Third Party Obligations. Retirement Plan Type [Domain] Retirement Plan Type [Domain] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Energy [Domain] Energy [Domain] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Other Comprehensive Income Information Tax [Abstract] Comprehensive Income Tax Including Portion Attributable To Non Controlling Interest [Abstract] Revenues and other income Revenues [Abstract] Amortization of stock-based awards Amortization Of Stock Based Awards Amortization Of Stock Based Awards Accumulated other comprehensive income Balance at beginning of period Balance at end of period Accumulated Other Comprehensive Income (Loss), Net of Tax Long-term debt Long-Term Debt and Lease Obligation Cumulative Foreign Exchange Translation Adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract] Financial Instruments And Derivatives [Abstract] Financial Instruments And Derivatives [Abstract] Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Cash interest paid Interest Paid, Including Capitalized Interest, Operating and Investing Activities [Abstract] Segments [Domain] Segments [Domain] Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Axis] Line of credit Line of Credit Facility, Remaining Borrowing Capacity Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Basis Of Financial Statement Preparation [Abstract] Basis Of Financial Statement Preparation [Abstract] Basis of Financial Statement Preparation [Abstract] Company Selected Measure Name Company Selected Measure Name Total Gross Assets & Liabilities [Domain] Fair Value Measurement [Domain] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] All Executive Categories All Executive Categories [Member] Common stock without par value (9,000 million shares authorized, 8,019 million shares issued) Common Stock, Value, Issued Long-term obligations to equity companies Long Term Obligations To Equity Companies Chemical Products Chemical Products [Member] Chemical Products Commitments and contingencies Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Amortization and settlement of postretirement benefits reserves adjustment included in net periodic benefit costs Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax Derivative [Table] Derivative [Table] Comprehensive income (loss) including noncontrolling interests Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Entity Small Business Entity Small Business Geographic Sales and Other Operating Revenue Revenue from External Customers by Geographic Areas [Table Text Block] Non-controlling Interests Noncontrolling Interest [Member] Document Transition Report Document Transition Report Underlying Securities Award Underlying Securities Amount Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Postretirement Benefits Reserves Adjustment [Roll Forward] Postretirement Benefits Reserves Adjustment [Roll Forward] Postretirement Benefits Reserves Adjustment PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Advances to/receivables from equity companies Advances To Receivables From Equity Companies Adjustment for foreign exchange translation (gain)/loss included in net income Amounts reclassified from accumulated other comprehensive income Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Other Revenue, Interest Other Revenue, Interest [Member] Other Revenue, Interest Hedging Designation [Axis] Hedging Designation [Axis] Total Equity Balance Balance Equity, Including Portion Attributable to Noncontrolling Interest Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Loss Contingencies [Table] Loss Contingencies [Table] Postretirement benefits reserves adjustment (excluding amortization) Current period change excluding amounts reclassified from accumulated other comprehensive income Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Product and Service [Axis] Product and Service [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Pension Benefits - U.S. Domestic Plan [Member] Revenue from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Additions to property, plant and equipment Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name Total current assets Assets, Current Capitalized, included in cash flows from investing activities Interest Paid, Capitalized, Investing Activity Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Total change in accumulated other comprehensive income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Current liabilities Liabilities, Current [Abstract] Geographical [Axis] Geographical [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Net Investment Hedge Risk Management Policy Derivatives, Methods of Accounting, Hedging Derivatives [Policy Text Block] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Total change in accumulated other comprehensive income Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Level 1 Fair Value, Inputs, Level 1 [Member] Earnings (loss) per common share, diluted (in dollars per share) Earnings Per Share, Diluted Cumulative Foreign Exchange Translation Adjustment [Roll Forward] Cumulative Translation Adjustment Summary [Roll Forward] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Security 12(b) Title Title of 12(b) Security Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Balance (in shares) - in treasury Balance (in shares) - in treasury Balance (in shares) - in treasury Treasury Stock, Common, Shares Earnings Per Share [Abstract] Earnings Per Share [Abstract] Consolidation Items [Domain] Consolidation Items [Domain] Short-term line of credit Line Of Credit Short Term [Member] Line Of Credit Short Term Derivative liability, statement of financial position [Extensible Enumeration] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Short-Term Debt, Type [Axis] Short-Term Debt, Type [Axis] Other Stockholders' Equity, Other Share repurchases, at cost (in shares) Treasury Stock, Shares, Acquired Award Timing Disclosures [Line Items] Service cost Defined Benefit Plan, Service Cost Non-debt-related Other Guarantees [Member] Other Guarantees. Current period change excluding amounts reclassified from accumulated other comprehensive income, Total Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Dividends - common shares (NCI) Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Unrealized gain (loss) on derivative instruments Gain (Loss) on Derivative Instruments, Net, Pretax Net income (loss) attributable to ExxonMobil Net income (loss) attributable to ExxonMobil Net income (loss) attributable to ExxonMobil Net Income (Loss) Attributable to Parent Intersegment Eliminations Intersegment Eliminations [Member] Expiration Date Trading Arrangement Expiration Date Liabilities, Noncurrent Liabilities, Noncurrent [Abstract] Production and manufacturing expenses Production and manufacturing expenses Costs, excluding deprecation, incurred to operate and maintain - 1) oil and gas wells, production, transportation and support equipment and facilities; 2) refining manufacturing facilities; and 3) chemical manufacturing facilities. Additions/(reductions) in commercial paper, and debt with three months or less maturity Proceeds from (Repayments of) Other Debt EQUITY Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Property, plant and equipment – net Property, Plant and Equipment, Net Segment reporting information [Line Items] Segment Reporting Information [Line Items] Common stock acquired Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Entity Current Reporting Status Entity Current Reporting Status Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Consolidated Entities [Domain] Consolidated Entities [Domain] Earnings reinvested Retained Earnings (Accumulated Deficit) Long-term debt Long Term Fair Value Debt Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Executive Category: Executive Category [Axis] 0.835% Notes due 2032 Zero Point Eight Three Five Percent Notes Due 2032 [Member] Zero Point Eight Three Five Percent Notes Due 2032 Additions to long-term debt Proceeds from Issuance of Long-Term Debt Interest expense Interest Expense, Operating and Nonoperating Current Fiscal Year End Date Current Fiscal Year End Date Class of Stock [Axis] Class of Stock [Axis] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Schedule Of Guarantees Schedule of Guarantor Obligations [Table Text Block] Statement [Table] Statement [Table] Derivative liabilities Derivative Liability CASH FLOWS FROM FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Natural gas (MMBTUs) Natural Gas [Member] Notes and accounts receivable – net Receivables, Net, Current Long-term line of credit Line Of Credit Long Term [Member] Line Of Credit Long Term Investments, advances and long-term receivables Long-Term Investments and Receivables, Net All Adjustments to Compensation All Adjustments to Compensation [Member] Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities, Current Amendment Flag Amendment Flag Inflows from noncontrolling interests for major projects Proceeds From Noncontrolling Interests For Major Projects Proceeds From Noncontrolling Interests For Major Projects Other Postretirement Benefits Other Postretirement Benefits Plan [Member] Common stock held in treasury (3,874 million shares at March 31, 2026 and 3,840 million shares at December 31, 2025) Treasury Stock, Common, Value Termination Date Trading Arrangement Termination Date Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Effect of Collateral Netting Effect Of Collateral Netting [Member] Measure: Measure [Axis] Postretirement Benefits Reserves Adjustment Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract] Petroleum products (barrels) Products [Member] Effect of Counterparty Netting Effect Of Counterparty Netting [Member] Basis of Financial Statement Preparation Basis of Presentation and Significant Accounting Policies [Text Block] Weighted average number of common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Disposal Group Classification [Domain] Disposal Group Classification [Domain] Earnings Per Share Computation Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Net investment hedge gain/(loss), net of taxes Other Comprehensive Income Loss Net Investment Hedge Gain Loss Net Of Tax Other Comprehensive Income Loss Net Investment Hedge Gain Loss Net Of Tax Segment Reporting [Abstract] Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Income from equity affiliates Income From Equity Affiliates [Member] Income From Equity Affiliates Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Entity Tax Identification Number Entity Tax Identification Number Costs and other deductions Costs and Expenses [Abstract] Other long-term financial liabilities Other Long Term Financial Liabilities Inventories Inventory, Net [Abstract] Total cash interest paid Interest Paid, Including Capitalized Interest, Operating and Investing Activities Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Short Short [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Common stock, shares, issued Balance (in shares) - issued Balance (in shares) - issued Common Stock, Shares, Issued Derivative asset, statement of financial position [Extensible Enumeration] Derivative Asset, Statement of Financial Position [Extensible Enumeration] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Total Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Proceeds from asset sales and returns of investments Proceeds from Sales of Business, Affiliate and Productive Assets Litigation and other contingencies [Line Items] Loss Contingencies [Line Items] Insider Trading Arrangements [Line Items] Segment Reporting, Reconciling Item, Corporate Nonsegment Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Security Exchange Name Security Exchange Name Total Liabilities Liabilities Cash dividends to noncontrolling interests Payments of Ordinary Dividends, Noncontrolling Interest Total Other Comprehensive Income (Loss), Net of Tax, Period Change [Abstract] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Postretirement benefits reserves Liability, Defined Benefit Plan, Noncurrent Reductions in short-term debt Repayments of Short-Term Debt, Maturing in More than Three Months Statement [Line Items] Statement [Line Items] Consolidation Items [Axis] Consolidation Items [Axis] Schedule of Capital Units [Table] Equity, Capital Unit or Share [Table] Disposal group not discontinued operation gain loss on disposal, after tax Disposal Group Not Discontinued Operation Gain Loss On Disposal, After Tax Disposal Group Not Discontinued Operation Gain Loss On Disposal, After Tax Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Accumulated Other Comprehensive Income [Roll Forward] Accumulated Other Comprehensive Income [Roll Forward] Accumulated Other Comprehensive Income Cash and cash equivalents Cash and Cash Equivalent Common Stock, without par value Common Stock Common Stock [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Increase/(decrease) in cash and cash equivalents (including restricted) Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Schedule of Income Tax (Expense)/Credit for Components of Other Comprehensive Income Schedule Of Income Tax Expense For Components Of Comprehensive Income [Table Text Block] Schedule Of Income Tax Expense For Components Of Comprehensive Income [Table Text Block]