Revision of Prior Period [Axis] Revision of Prior Period [Axis] Accumulated other comprehensive (income) loss, other, after tax, beginning balance Accumulated other comprehensive (income) loss, other, after tax, ending balance Accumulated Other Comprehensive (Income) Loss, Other, after Tax Accumulated Other Comprehensive (Income) Loss, Other, after Tax Statistical Measurement [Domain] Statistical Measurement [Domain] Long-term debt – borrowings Proceeds from Issuance of Long-Term Debt and Capital Securities, Net Other current assets Other Current Assets [Member] Property, plant and equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Commodity derivatives Commodity Contract [Member] Crude oil Crude Oil [Member] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Temporary Equity [Abstract] Temporary Equity [Abstract] Award Timing Predetermined Award Timing Predetermined [Flag] Entity File Number Entity File Number Additional Paid-in Capital Additional Paid-in Capital [Member] Other Noncurrent Assets Other Noncurrent Assets [Member] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Income from equity method investments Income from equity method investments Income (Loss) from Equity Method Investments Tabular List, Table Tabular List [Table Text Block] OCI, tax expense (benefit) Other Comprehensive Income (Loss), Tax Basic: Basic earnings per share: Earnings Per Share, Basic [Abstract] Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Percentage of derivative contracts expiring in the next quarter Derivative Instruments Percentage Of Derivative Contracts Expiration1 Percentage Of Derivative Contracts Expiring in the following quarter. Renewable Diesel JV planned turnaround costs Renewable Diesel JV planned turnaround costs Renewable Diesel JV planned turnaround costs Maximum potential undiscounted payments Guarantor Obligations, Maximum Exposure, Undiscounted Soybean oil Soybean oil [Member] Soybean oil Position [Axis] Position [Axis] Corporate Capital Expenditures Excluding Capitalized Interest Capital Expenditures Excluding Capitalized Interest Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Measurement Basis [Axis] Measurement Basis [Axis] Net income (loss) attributable to MPC per share Basic earnings (loss) per share Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Related Party Transactions Related Party Transactions Disclosure [Text Block] Amounts reclassified from accumulated other comprehensive loss: Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [Abstract] Schedule of Line of Credit Facilities Schedule of Line of Credit Facilities [Table Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Current liabilities and other current assets Increase (Decrease) in Accounts Payable and Accrued Liabilities Revenue Revenue from Contract with Customer [Text Block] Actuarial changes Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] Equity transactions of MPLX Equity transactions of MPLX Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net Other comprehensive income (loss) Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Adjusted EBITDA Schedule of Segment Reporting Information, by Segment [Table Text Block] Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Cash collateral netted with derivative liabilities Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Share Repurchase Authorization November 2024 Share Repurchase Authorization November 2024 [Member] Share Repurchase Authorization November 2024 Materials and supplies Other Inventory, Supplies, Gross Adjustment to Compensation, Amount Adjustment to Compensation Amount Pension Benefits Pension Plan [Member] Consolidation Consolidation, Policy [Policy Text Block] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Refined products Fuel [Member] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Less investments in equity method investees(a) Payments to Acquire Equity Method Investments Dividends declared on common stock Dividends, Common Stock, Cash Total MPC stockholders’ equity Equity, Attributable to Parent Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Measurement Frequency [Axis] Measurement Frequency [Axis] Insider Trading Policies and Procedures [Line Items] Summary Of Property, Plant And Equipment Property, Plant and Equipment [Table Text Block] Common stock, shares authorized Common Stock, Shares Authorized Capital expenditures and investments Capital Expenditures And Investments Capital expenditures (including payments to acquire property, plant and equipment; payments to acquire businesses excluding inventories and liabilities assumed; and change in capital accruals) and investments. Loss contingency, damages paid, value Loss Contingency, Damages Paid, Value Total liabilities and equity Liabilities and Equity Fair Value, Recurring Fair Value, Recurring [Member] Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Accumulated Defined Benefit Plans Adjustment Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Cover [Abstract] Cover [Abstract] MPC bank revolving credit facility due July 2027 MPC Revolving Credit Facility due July 2027 [Member] MPC Revolving Credit Facility due July 2027 Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Maximum Maximum [Member] Senior Notes Due April 2056 Senior Notes, 6.100% due April 2056 [Member] Senior Notes, 6.100% due April 2056 [Member] Average forward price Derivative, Average Forward Price Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Pension and other postretirement non-service costs Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component Treasury Stock 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] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Tax impact Consolidation, Less Than Wholly Owned Subsidiary, Parent Ownership, Changes, Tax Impact Consolidation, Less Than Wholly Owned Subsidiary, Parent Ownership, Changes, Tax Impact Liabilities Liabilities [Abstract] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] MPLX MPLX LP [Member] MPLX LP [Member] Income before income taxes Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Common stock: Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Summary of Supplemental Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] BANGL, LLC Acquisition BANGL, LLC Acquisition [Member] BANGL, LLC Acquisition Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Employer contributions Defined Benefit Plan, Plan Assets, Contributions by Employer Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Comprehensive income (loss) attributable to MPC Comprehensive Income (Loss), Net of Tax, Attributable to Parent Forward commodity price Derivative, Forward Price Disposal Group Name [Domain] Disposal Group Name [Domain] Name Measure Name Letter of Credit Letter of Credit [Member] Distributions to noncontrolling interests Payments to Noncontrolling Interests Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Table Text Block] Refined products Refined Products [Member] Refined Products [Member] Realized Gain (Loss), Investment and Derivative, Operating, before Tax Derivative Instruments Not Designated as Hedging Instruments, Realized Gain (Loss), NetRealized Gain Derivative Instruments Not Designated as Hedging Instruments, Realized Gain (Loss), NetRealized Gain Operating lease liabilities Operating Lease, Liability, Current Deferred income taxes Deferred Income Tax Liabilities, Net Document Fiscal Period Focus (Q1,Q2,Q3,FY) Document Fiscal Period Focus Award Timing Method Award Timing Method [Text Block] Less net income attributable to: Net Income (Loss) Attributable to Noncontrolling Interest [Abstract] Award Type Award Type [Axis] Commodity derivative instruments, liabilities - netting and collateral Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset Revision of Prior Period, Adjustment Revision of Prior Period, Adjustment [Member] MPC: Parent Company [Member] Legal Entity [Axis] Legal Entity [Axis] Total assets Assets Investment, Name [Domain] Investment, Name [Domain] Trading Symbol Trading Symbol Matching buy/sell receivables Matching Buy/Sell Receivables Carrying amounts due as of the balance sheet date of the amounts receivable from matching buy/sell transactions. Accumulated other comprehensive (income) loss, defined benefit plan, after tax, beginning balance Accumulated other comprehensive (income) loss, defined benefit plan, after tax, ending balance Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Alternative Investment, Valuation Technique [Extensible Enumeration] Alternative Investment, Valuation Technique [Extensible Enumeration] Number of common shares issued - stock compensation Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Address, City or Town Entity Address, City or Town Operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Other segment items Segment Reporting, Other Segment Item, Amount Acquired finite-lived intangible assets, weighted average useful life Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Inventories Inventory Disclosure [Text Block] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Plus: Segment, Reconciliation of Other Items from Segments to Consolidated [Abstract] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Total consideration Business Combination, Consideration Transferred Trade Receivables Securitization due April 2029 Trade Receivables Securitization due April 2029 [Member] Trade Receivables Securitization due April 2029 [Member] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Distribution costs Distribution costs Distribution costs Dividends declared per share of common stock (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Commodity derivative instruments, liabilities - collateral pledged not offset Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Total assets acquired Business Combination, Recognized Asset Acquired, Asset 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] Unamortized debt issuance costs Debt Issuance Costs, Net Level 2 Fair Value, Inputs, Level 2 [Member] Gain (Loss) Derivative, Gain (Loss) on Derivative, Net Equity method investments Equity Method Investments Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination [Domain] Business Combination [Domain] Basis of Accounting Basis of Accounting [Text Block] Related Party Related Party [Member] PEO PEO [Member] Total revenues and other income Revenues And Other Income Total revenues and other income is the sum of sales and other operating revenues (including consumer excise taxes), income from equity method investments, net gain on disposal of assets, and other income. MPC trade receivables securitization facility due September 2027 Trade Receivables Securitization due September 2027 [Member] Trade Receivables Securitization due September 2027 Interest income Investment Income, Interest Changes in: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] 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] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Retained Earnings Retained Earnings [Member] Capital expenditures Capital expenditures Capital Expenditure Capital expenditures Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Cash, cash equivalents, restricted cash and restricted cash equivalents, beginning balance Cash, cash equivalents, restricted cash and restricted cash equivalents, ending balance Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Provision for income taxes Income Tax Expense (Benefit) Accrued taxes Taxes Payable, Current Long-term debt – repayments Repayment of Long-Term Debt, Long-Term Lease Obligation, and Capital Security Preferred stock, shares issued Preferred Stock, Shares Issued Intangibles, net Intangible Assets, Net (Excluding Goodwill) 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] Adjusted EBITDA Adjusted EBITDA Adjusted EBITDA Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Business Combination [Table] Business Combination [Table] Refining & Marketing Refining And Marketing [Member] MPC's Refining and Marketing operating segment refines crude oil and other feedstocks at our refineries in the Gulf Coast and Midwest regions of the United States and distributes refined products through various means, including barges, terminals and trucks that we own or operate. We sell refined products to wholesale marketing customers domestically and internationally, to buyers on the spot market, to our Speedway segment and to dealers and jobbers who operate Marathon-branded retail outlets. Discontinued Operations and Disposal Groups [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Other Accumulated Gain (Loss), Other [Member] Accumulated Gain (Loss), Other [Member] Cost of purchases Cost, Direct Material Other Income and Expenses [Abstract] Other Income and Expenses [Abstract] Business Combination, Recognized Asset Acquired and Liability Assumed Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Recognized identifiable assets acquired and liabilities assumed, net working capital Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Net Working Capital Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Net Working Capital Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Accumulated Depreciation Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization City Area Code City Area Code Acquisitions and Other Transactions Mergers, Acquisitions and Dispositions Disclosures [Text Block] Acquisitions, net of cash acquired Payments to acquire businesses, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired 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] Class of Treasury Stock [Table] Class of Treasury Stock [Table] Senior Notes Due April 2036 Senior Notes, 5.300% due April 2036 [Member] Senior Notes, 5.300% due April 2036 [Member] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Refining & Renewable Diesel planned turnaround costs Refining & Renewable Diesel planned turnaround costs Refining & Renewable Diesel planned turnaround costs Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Related Party Transactions [Abstract] Related Party Transactions [Abstract] Preferred stock, par or stated value per share Preferred Stock, Par or Stated Value Per Share Amortization of actuarial loss Defined Benefit Plan, Amortization of Gain (Loss) Subsequent Event Subsequent Event [Member] Other current assets Business Combination, Recognized Asset Acquired, Other Asset, Current Cost of revenues Cost of Sales [Member] Goodwill Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Depreciation Depreciation Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Commodity derivative instruments, liabilities - gross Derivative Liability, Subject to Master Netting Arrangement, before Offset Assets acquired: Business Combination, Recognized Asset Acquired, Asset [Abstract] Other Liabilities Disclosure Other Liabilities Disclosure [Text Block] Equity Components [Axis] Equity Components [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Other Accumulated Gain (Loss), Net, Other [Member] Accumulated Gain (Loss), Net, Other[Member] Number of reportable segments Number of Reportable Segments Unamortized discount, net of unamortized premium Debt Instrument, Unamortized Discount (Premium), Net Sales and other operating revenues Sales [Member] Receivables Business Combination, Recognized Asset Acquired, Receivable, Current Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Other Performance Measure, Amount Other Performance Measure, Amount Amounts due within one year Debt, Current Debt issuance costs Payments of Debt Issuance Costs Entity Address, State or Province Entity Address, State or Province Payments for repurchase of common stock excluding excise taxes on share repurchases Payments For Repurchase Of Common Stock Excluding Excise Taxes On Share Repurchases Payments For Repurchase Of Common Stock Excluding Excise Taxes On Share Repurchases Related Party, Type [Domain] Related and Nonrelated Parties [Domain] Total current liabilities Liabilities, Current Other current liabilities Other Current Liabilities [Member] Net change in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation Interest capitalized Interest Costs Capitalized Adjustment Fair value of net assets acquired Business Combination, Consideration Transferred and Preacquisition Equity Interest in Acquiree Derivative Instrument [Axis] Derivative Instrument [Axis] Individual: Individual [Axis] Gross PP&E Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Operating costs Manufacturing Costs Dividends paid Payments of Ordinary Dividends, Common Stock Other current assets Other Assets, Current Additional paid-in capital Additional Paid in Capital, Common Stock Entity [Domain] Entity [Domain] 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] Changes in the fair value of derivative instruments Unrealized Gain (Loss) on Derivatives Unrealized Gain (Loss) on Derivatives and Commodity Contracts Interest paid (net of amounts capitalized) Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Share Repurchase Authorization August 2025 Share Repurchase Authorization August 2025 [Member] Share Repurchase Authorization August 2025 Right of use assets, net Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Income tax credits and adjustments Income Tax Credits and Adjustments Entity Interactive Data Current Entity Interactive Data Current Exchange Traded Exchange Traded [Member] Reported Value Measurement Reported Value Measurement [Member] Other taxes Taxes, Miscellaneous Share Repurchase Authorization August 2022 Share Repurchase Authorization August 2022 [Member] Share Repurchase Authorization August 2022 Equity [Abstract] Equity [Abstract] Net Interest And Other Financial Income (Costs) Interest and Other Income [Table Text Block] Noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Nonredeemable Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Attributable to Nonredeemable Noncontrolling Interest Derivative instruments Derivatives, Policy [Policy Text Block] Segment Information Segment Reporting Disclosure [Text Block] Debt due within one year Long-Term Debt and Lease Obligation, Current Total debt Debt and Lease Obligation Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Distributions to noncontrolling interests Temporary Equity, Other Changes Ownership [Domain] Ownership [Domain] Components of Net Periodic Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Pension and other postretirement benefits, net Pension and Other Postretirement Benefits Expense (Reversal of Expense), Noncash Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Contingent consideration Business Combination, Contingent Consideration, Liability Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Noncontrolling interests Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest Equity transactions of MPLX Stock Redeemed or Called During Period, Value Selling, general and administrative expenses Selling, General and Administrative Expense Increase (decrease) in capital accruals Increase (Decrease) In Accrual For Capital Expenditures Increase (decrease) during the period in the accrual for capital expenditures Changes in Accumulated Other Comprehensive Loss by Component Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization Other noncurrent assets Other Assets, Noncurrent Accrued interest payable Interest Payable, Current Entity Central Index Key Entity Central Index Key PEO Name PEO Name 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] Purchases from related parties(a) Costs and Expenses, Related Party Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Elements [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Finance lease obligations Finance Lease, Liability Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Commodity derivative instruments, assets - netting and collateral Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset Northwind Midstream Acquisition Northwind Midstream Acquisition [Member] Northwind Midstream Acquisition Segments [Axis] Segments [Axis] Classification of Fair Values of Derivative Instruments, Excluding Cash Collateral Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Less comprehensive income attributable to: Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest [Abstract] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid All other, net Payment for (Proceeds from) Other Investing Activity All other, net Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item Subsequent Event Type [Axis] Subsequent Event Type [Axis] Units repurchased, units Stock Repurchased and Retired During Period, Shares Long Long [Member] Intangibles Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill Cash and cash equivalents Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent Consideration Disposal Group, Including Discontinued Operation, Consideration Assets Assets [Abstract] Crude oil and other feedstocks Energy Related Inventory, Crude Oil and Natural Gas Liquids Guarantee of Indebtedness of Others Guarantee of Indebtedness of Others [Member] Credit Facility [Axis] Credit Facility [Axis] Spread Contracts Other Contract [Member] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Axis] Preferred stock: Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract] Other Commitments [Axis] Other Commitments [Axis] Components of net periodic benefit cost: Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Uncommitted Amount Uncommitted Amount [Member] Uncommitted Amount [Member] Debt Instrument [Axis] Debt Instrument [Axis] Bonds Bonds [Member] Martinez JV Martinez JV [Member] Martinez JV Pension and Other Postretirement Plans Retirement Benefits [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Business Combination [Line Items] Business Combination [Line Items] Credit Facility [Domain] Credit Facility [Domain] 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 Shares repurchased Treasury Stock, Value, Acquired, Cost Method Other noncurrent assets Business Combination, Recognized Asset Acquired, Asset, Noncurrent Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Investment, Name [Axis] Investment, Name [Axis] Accounts receivable, allowance for credit loss, current Accounts Receivable, Allowance for Credit Loss, Current Revenue from External Customers by Products and Services Revenue from External Customers by Products and Services [Table Text Block] Long-term operating lease liabilities Operating Lease, Liability, Noncurrent Beginning balance Ending balance Redeemable Noncontrolling Interest, Equity, Carrying Amount Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] MPLX Revolving Credit Facility Due April 2031 MPLX Revolving Credit Facility Due April 2031 [Member] MPLX Revolving Credit Facility Due April 2031 [Member] Ownership [Axis] Ownership [Axis] Derivatives Derivative Instruments and Hedging Activities Disclosure [Text Block] Amortization of prior service credit Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Commodity derivative instruments, assets - gross Asset Derivative Asset, Subject to Master Netting Arrangement, before Offset 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 Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Entity Registrant Name Entity Registrant Name Schedule of Business Combination, Consideration Schedule of Business Combination, Consideration [Table Text Block] Schedule of Business Combination, Consideration Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Other financial costs Interest Expense, Other Alternative Investment, Measurement Input Alternative Investment, Measurement Input Outstanding Borrowings Schedule of Long-Term Debt Instruments [Table Text Block] Rockies Business Rockies Operations [Member] Rockies Operations Total costs and expenses Costs and expenses Costs and Expenses Related Party Transaction [Line Items] Related Party Transaction [Line Items] Document Quarterly Report Document Quarterly Report Other Significant Reconciling Items from Segments to Consolidated Segment, Reconciliation of Other Items from Segments to Consolidated [Table Text Block] Long-term debt, fair value Long-Term Debt, Fair Value Revision of Prior Period [Domain] Revision of Prior Period [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Commercial paper – repayments Repayments of Commercial Paper BANGL, LLC BANGL, LLC [Member] BANGL, LLC Energy [Axis] Energy [Axis] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Other income Other Income [Member] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Accounting Standards Update and Change in Accounting Principle [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] 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 Clean fuel production tax credit Clean fuel production tax credit Clean fuel production tax credit Increase (decrease) due to change in ownership Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Issuance of Equity by Subsidiary to Noncontrolling Interests Net interest and other financial costs Net interest and other financial costs Net interest and other financial costs Interest and Debt Expense Amortization of actuarial loss Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Deferred credits and other liabilities Other Noncurrent Liabilities [Member] Restatement Determination Date: Restatement Determination Date [Axis] Total cash paid Payments to Acquire Businesses, Gross Non-PEO NEO Non-PEO NEO [Member] Outstanding Letters of Credit Letters of Credit Outstanding, Amount Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Position [Domain] Position [Domain] All other, net Proceeds from (Payment for) Other Financing Activity Interest expense Interest Expense, Debt Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Liabilities assumed: Business Combination, Recognized Liability Assumed, Liability [Abstract] LOOP and LOCAP LLC Loop And Locap Llc [Member] LOOP and LOCAP LLC [Member] Name Trading Arrangement, Individual Name All Award Types Award Type [Domain] Previously Reported Previously Reported [Member] 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] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Debt instrument, face amount Debt Instrument, Face Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Estimate of Fair Value Measurement Estimate of Fair Value Measurement [Member] Tax effect Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax Share-based compensation Total Adjustments to Equity From Share Based Compensation Total Adjustments to Equity From Share Based Compensation Retirement Plan Type [Domain] Retirement Plan Type [Domain] Share Repurchase Program [Axis] Share Repurchase Program [Axis] 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] Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items] Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Revenues and other income: Revenues [Abstract] Held in treasury, at cost – 702 million and 699 million shares Treasury Stock, Value Refined products Energy Related Inventory Refined Products Balance includes refined products. Inventories are carried at the lower of cost or market value. The cost of inventories of refined products is determined primarily under the last-in, first-out ("LIFO") method. Accumulated other comprehensive loss Accumulated other comprehensive loss, beginning balance Accumulated other comprehensive loss, ending balance Accumulated Other Comprehensive Income (Loss), Net of Tax Long-term debt Long-Term Debt and Lease Obligation Other comprehensive income (loss) before reclassifications, tax Other Comprehensive Income (Loss) before Reclassifications, Tax Bakken Pipeline System Bakken Pipeline System [Member] Bakken Pipeline System [Member] Segments [Domain] Segments [Domain] Loss contingency, damages sought, value Loss Contingency, Damages Sought, Value Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Percentage of ownership before transaction Sale of Stock, Percentage of Ownership before Transaction Available Capacity 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] Balance Sheet Location [Domain] Statement of Financial Position Location, Balance [Domain] Inventories Increase (Decrease) in Inventories Inventories Total Inventory, Net Amortization of deferred financing costs and debt discount Amortization of Debt Issuance Costs and Discounts Minimum Minimum [Member] Commodity derivative instruments, assets - 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Method Investment, Distribution, Return of Capital Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] The amount of total (gain) loss for the period included in earnings attributable to the change in unrealized (gain) loss relating to liabilities still held at the end of period Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) Units repurchased, value Stock Repurchased and Retired During Period, Value Embedded derivatives in commodity contracts Embedded Derivative Financial Instruments [Member] Segment, Reconciliation of Other Items from Segments to Consolidated [Table] Segment, Reconciliation of Other Items from Segments to Consolidated [Table] 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Measurement Frequency [Domain] Measurement Frequency [Domain] Payroll and benefits payable Employee-related Liabilities, Current Property, Plant and Equipment Property, Plant and Equipment Disclosure [Text Block] Other comprehensive income (loss), before reclassifications, net of tax Other Comprehensive Income (Loss), before Reclassifications, Net of Tax MPLX LP MPLX: Subsidiaries [Member] Property, plant and equipment, net Net PP&E Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Equity Equity [Text Block] Total Capacity Line of Credit Facility, Current Borrowing Capacity Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Distributions to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Other Current Liabilities Other Current Liabilities [Table Text Block] Net income (loss) attributable to MPC Net income attributable to MPC Net Income (Loss) Attributable to Parent Contribution of assets Contribution of Net Assets Contribution of Net Assets Intersegment Eliminations Intersegment Eliminations [Member] Expiration Date Trading Arrangement Expiration Date Other Commitments [Domain] Other Commitments [Domain] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Preferred stock, shares authorized Preferred Stock, Shares Authorized Common stock repurchased Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Contingent consideration, maximum, amount Business Combination, Contingent Consideration, Range of Outcomes, Maximum, Amount Compensation Actually Paid vs. Net 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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] Repayments of debt Repayments of Debt Class of Stock [Axis] Class of Stock [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Net Interest and Other Financial Costs Interest and Other Income [Text Block] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Other current liabilities Business Combination, Recognized Liability Assumed, Other Liability, Current 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] Statement [Table] Statement [Table] Deferred income taxes Deferred Income 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expenses, excluding depreciation Contract with Customer, Liability Contract with Customer, Liability Reconciliation of Additions to Property, Plant and Equipment to Total Capital Expenditures Schedule Of Reconciliation Of Additions To Property Plant And Equipment To Total Capital Expenditures [Table Text Block] Schedule of Reconciliation of Additions to Property, Plant And Equipment to Total Capital Expenditures [Table Text Block] Distributions from equity method investments Proceeds from Equity Method Investment, Distribution Assets and Liabilities Accounted for at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Financial Support to Nonconsolidated Legal Entity [Domain] Financial Support to Nonconsolidated Legal Entity [Domain] Total identifiable net assets Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Reconciliation of Net Beginning and Ending Balances Recorded for Net 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Trading Arrangement Termination Date Net cash provided by (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] Measure: Measure [Axis] Renewable Diesel Renewable Diesel [Member] Renewable Diesel Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Repurchases of noncontrolling interests Payments for Repurchase of Other Equity Weighted average shares outstanding Weighted average common shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Stock repurchase program, remaining authorized repurchase amount Share Repurchase Program, Remaining Authorized, Amount Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Cost of revenues (excludes items below) Cost of Product and Service Sold Other long-term liabilities Business Combination, Recognized Liability Assumed, Liability, Noncurrent Disposal Group Classification [Domain] Disposal Group Classification [Domain] Summary of Earnings (Loss) Per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Share Repurchase Program [Table] Share Repurchase Program [Table] Notional contracts (in thousands of total barrels) Derivative, Nonmonetary Notional Amount Subsequent Events [Abstract] Segment Reporting [Abstract] Segment Reporting [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Derivative asset, net carrying value on balance sheet Derivative Asset, Subject to Master Netting Arrangement, after Offset Entity Tax Identification Number Entity Tax Identification Number Proceeds from sale of equity method investments Proceeds from Sale of Equity Method Investments Costs and expenses: Costs and Expenses [Abstract] Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] 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, par or stated value per share Common Stock, Par or Stated Value Per Share Common stock, shares, issued Beginning balance Ending balance Common Stock, Shares, Issued Purchase crude oil from Strategic Petroleum Reserve Purchase crude oil from Strategic Petroleum Reserve [Member] Purchase crude oil from Strategic Petroleum Reserve [Member] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Receivables for recoverable costs Recorded Third-Party Environmental Recoveries Receivable Disposal of assets Proceeds from Sales of Business, Affiliate and Productive Assets Loss Contingencies [Line Items] Loss Contingencies [Line Items] Liability Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Subsequent Events Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Corporate Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Security Exchange Name Security Exchange Name Reconciliation of Revenue from Segments to Consolidated Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Environmental credits liability Regulatory Liability, Current Other Pension Plan Other Pension Plan [Member] MPLX bank revolving credit facility due July 2027 MPLX Revolving Credit Facility due July 2027 [Member] MPLX Revolving Credit Facility due July 2027 Total liabilities Liabilities Goodwill, expected tax deductible percent Business Combination Purchase Price Allocation Goodwill Expected Tax Deductible Percent Business Combination Purchase Price Allocation Goodwill Expected Tax Deductible Percent Settlements of derivative instruments Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] The Andersons Marathon Holdings LLC The Andersons Marathon Holdings LLC [Member] The Andersons Marathon Holdings LLC Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Other current liabilities Total other current liabilities Other Liabilities, Current Investments – acquisitions and contributions Payments to Acquire Interest in Joint Venture Swing-line Loan Swing-line Loan [Member] Swing-line Loan [Member] Other current liabilities Other Sundry Liabilities, Current Defined benefit postretirement plan obligations Liability, Defined Benefit Plan, Noncurrent Fair value of previously held equity interest Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Fair Value Long-term debt Business Combination, Recognized Liability Assumed, Long-Term Debt, Noncurrent Additional ownership acquired Equity Method Investment, Additional Ownership Acquired Equity Method Investment, Additional Ownership Acquired Statement [Line Items] Statement [Line Items] Consolidation Items [Axis] Consolidation Items [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Midstream Midstream [Member] MPC's Midstream operating segment transports crude oil and other feedstocks to our refineries and other locations and delivers refined products to wholesale and retail market areas, and owns, among other transportation-related assets, a majority interest in LOOP LLC, which is owner and operator of the only U.S. deepwater oil port. The segment was previously called the Pipeline Transportation segment, but was renamed with the MarkWest merger to reflect the expanded business activity in natural gas and natural gas liquids markets. Common Stock Common Stock [Member] Net income (loss) Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Marathon Petroleum Corporation Marathon Petroleum Corporation [Member] Marathon petroleum corporation. Effect of dilutive securities (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Long-term operating lease liabilities Business Combination, Recognized Liability Assumed, Operating Lease Liability, Long-term Business Combination, Recognized Liability Assumed, Operating Lease Liability, Noncurrent Valuation Technique, Discounted Cash Flow [Member]