Dividends paid on common stock (in usd per share) Common Stock, Dividends, Per Share, Cash Paid Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] Short-term debt Business Combination, Recognized Liability Assumed, Short-Term Debt Business Combination, Recognized Liability Assumed, Short-Term Debt Statistical Measurement [Domain] Statistical Measurement [Domain] Properties, plants and equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Schedule of Material Net Exposures and Notional Amount of Derivative Contracts Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Commodity derivatives Commodity Derivative Assets Commodity Contract [Member] Crude oil resales Crude Oil [Member] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Propel Fuels Litigation Propel Fuels Litigation [Member] Propel Fuels Litigation Int’l. Foreign Plan [Member] Award Timing Predetermined Award Timing Predetermined [Flag] Related Party Transaction [Axis] Related Party Transaction [Axis] Entity File Number Entity File Number Capital in Excess of Par Additional Paid-in Capital [Member] Expected period to incur a substantial amount of expenditures Accrual For Environmental Loss Contingencies, Expected Period To Incur Majority Of Expenditures Accrual For Environmental Loss Contingencies, Expected Period To Incur Majority Of Expenditures Equity in earnings of affiliates Equity in earnings of affiliates Income (Loss) from Equity Method Investments Compensating balance Compensating Balance, Amount Tabular List, Table Tabular List [Table Text Block] Basic Earnings Per Share, Basic [Abstract] Number of options to extend Line Of Credit Facility, Number Of Options To Extend Line Of Credit Facility, Number Of Options To Extend Schedule of Significant Transactions with Related Parties Schedule of Related Party Transactions [Table Text Block] Accounts payable Increase (Decrease) in Accounts Payable Maximum potential amount of future payments under the guarantees Guarantor Obligations, Maximum Exposure, Undiscounted Debt to capitalization ratio Debt Instrument Covenant, Debt To Capitalization Ratio Debt Instrument Covenant, Debt To Capitalization Ratio Variable Rate Component One Variable Rate Component One [Member] Variable Rate Component One Position [Axis] Position [Axis] Income (Loss) from Subsidiaries, Net of Tax [Abstract] Income (Loss) from Subsidiaries, Net of Tax [Abstract] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Measurement Basis [Axis] Measurement Basis [Axis] Basic (in usd per share) Earnings Per Share of Common Stock (in usd per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Related Party Transactions Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Commercial Paper Commercial Paper [Member] Sales and Other Operating Revenues Revenue from Contract with Customer [Text Block] Financial assets Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding Other Comprehensive Income (Loss), Net of Income Taxes Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Schedule of Analysis of Results by Operating Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Effect of Collateral Netting Effect of Collateral Netting Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Remaining performance obligations Revenue, Remaining Performance Obligation, Amount Adjustment to Compensation, Amount Adjustment to Compensation Amount Midstream Midstream Midstream Segment [Member] Midstream segment. Pension Benefits Pension Plan [Member] Accounts and notes receivable, percent outstanding less than 60 days Accounts And Notes Receivable, Percent Outstanding Less Than 60 Days Accounts and Notes Receivable, Percent Outstanding less than 60 days Percentage of derivative contract volume expiring within twelve months Estimated Percentage Of Derivative Contract Volume Expiring Within Twelve Months Estimated percentage of derivative contract volume expiring within twelve months 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] Proceeds from asset dispositions Proceeds from Sale of Productive Assets Net working capital deficit Business Combination, Net Working Capital Business Combination, Net Working Capital Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Income taxes on foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Dividends paid on common stock Dividends, Common Stock, Cash Total Stockholders’ Equity Equity, Attributable to Parent Impairments Impairments Asset Impairment Charges Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Insider Trading Policies and Procedures [Line Items] Schedule of Properties, Plants and Equipment with Associated Accumulated Depreciation and Amortization Property, Plant and Equipment [Table Text Block] Common stock authorized (in shares) Common Stock, Shares Authorized Hedging Designation [Domain] Hedging Designation [Domain] Total Liabilities and Equity Liabilities and Equity Defined Benefit Plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Cash and cash equivalents at beginning of period Cash and Cash Equivalents at End of Period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Capital expenditures and investments Capital Expenditures and Investments Capital Expenditures And Investments Cash outflows for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets as well as net cash outflows associated with the acquisition of investments. Cover [Abstract] Cover [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Maximum Maximum [Member] United States and Europe United States And Europe [Member] United States And Europe [Member] Equity Method Investment [Table] Equity Method Investment [Table] Less: net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Effect of Collateral Netting Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Guarantees [Abstract] Guarantees [Abstract] Physical forward contracts Forward Contracts [Member] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Treasury Stock Treasury Stock, Common [Member] Corporate Reconciling Items and Eliminations Corporate Reconciling Items And Eliminations [Member] Corporate Reconciling Items And Eliminations Corporate and Other Corporate And Eliminations [Member] Corporate And Eliminations 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 Other assets Other Assets [Member] Liabilities Liabilities [Abstract] Business Combinations Business Combination [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Scheduled interest payments annually Debt Instrument, Periodic Payment, Interest Commodity Derivative, Nonmonetary Notional Amount, Volume Entity Shell Company Entity Shell Company Shares 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] Issuance of debt Proceeds from Issuance of Debt Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Schedule of Supplemental Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Sales and other operating revenues Sales And Other Operating Revenues [Member] Sales and other operating revenues member. Lessee operating lease remaining lease term (up to) Lessee, Operating Lease, Remaining Lease Term Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Company contributions to plans Defined Benefit Plan, Plan Assets, Contributions by Employer Less: comprehensive income 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 Attributable to Phillips 66 Comprehensive Income (Loss), Net of Tax, Attributable to Parent 364 Day Receivables Securitization Facility Due September 364 Day Receivables Securitization Facility Due September [Member] 364 Day Receivables Securitization Facility Due September Los Angeles Refinery Assets Los Angeles Refinery [Member] Los Angeles Refinery Name Measure Name Net Income Attributable to Phillips 66 Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Secured Debt Secured Debt [Member] Consolidation, Less-than-Wholly-Owned Subsidiary, Parent Ownership Interest, Effect of Change [Table] Consolidation, Less-than-Wholly-Owned Subsidiary, Parent Ownership Interest, Effect of Change [Table] Deferred income taxes Deferred Income Tax Liabilities, Net Document Fiscal Period Focus Document Fiscal Period Focus Total Revenues and Other Income Revenues And Other Income Total revenue and other income recognized during the reporting period, including equity in earnings of affiliates and other income. Non-cash financing activities Cash Flow, Noncash Financing Activities Disclosure [Abstract] Cash Flow, Noncash Financing Activities Disclosure Award Timing Method Award Timing Method [Text Block] Litigation Case [Domain] Litigation Case [Domain] Award Type Award Type [Axis] Foreign Currency Translation Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Long-term debt Long-Term Debt Legal Entity [Axis] Legal Entity [Axis] Total Assets Total Assets Assets Dakota Access and ETCO Dakota Access and ETCO [Member] Dakota Access LLC (DAPL) and Energy Transfer Crude Oil Company, LLC (ETCOP), collectively. Assets that Continue to be Recognized, Transferred Financial Assets and Other Financial Assets Managed Together [Table] Assets that Continue to be Recognized, Transferred Financial Assets and Other Financial Assets Managed Together [Table] Investment, Name [Domain] Investment, Name [Domain] Trading Symbol Trading Symbol Geographical [Domain] Geographical [Domain] Shares issued—share-based compensation (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Derivatives and Financial Instruments Financial Instruments And Derivative Contracts [Text Block] The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts, including disclosure of credit risk. Entity Address, City or Town Entity Address, City or Town Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Cash Flows From Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Other segment items Segment Reporting, Other Segment Item, Amount Inventories Inventory Disclosure [Text Block] 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] Damages awarded Loss Contingency, Damages Awarded, Value Total consideration Business Combination, Consideration Transferred Renewable Fuels Renewable Fuels [Member] Renewable Fuels Entity Emerging Growth Company Entity Emerging Growth Company Difference in Carrying Value and Fair Value Financial And Nonfinancial Liability, Difference In Carrying Value And Fair Value Financial And Nonfinancial Liability, Difference In Carrying Value And Fair Value Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding 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] Asset retirement obligations and accrued environmental costs Asset Retirement Obligations And Accrued Environmental Cost Noncurrent portion of the carrying amount of a liability for an asset retirement obligation, as well as the carrying value of an obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer. Level 2 Fair Value, Inputs, Level 2 [Member] Equity 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] Interim Financial Information Basis of Accounting [Text Block] Related Party Related Party [Member] Net gain on dispositions Gain (Loss) on Disposition of Other Assets 1.300% Senior Notes Due February 2026 1.300% Senior Notes Due February 2026 [Member] 1.300% Senior Notes Due February 2026 Damages awarded, jury verdict Loss Contingency, Damages Awarded, Jury Verdict, Value Loss Contingency, Damages Awarded, Jury Verdict, Value PEO PEO [Member] Accretion on discounted liabilities Accretion on discounted liabilities Accretion Expense, Including Asset Retirement Obligations Line of credit facility, utilized Line of Credit Facility, Maximum Month-end Outstanding Amount Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] DCP LP DCP Midstream, LP [Member] DCP Midstream, LP United States U.S. UNITED STATES Working capital adjustments 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] Carrying amount of indemnifications Guarantor Obligations, Current Carrying Value Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Retained Earnings Retained Earnings [Member] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Income Statement [Abstract] Income Statement [Abstract] Income tax expense Income Tax Expense (Benefit) Debt instrument, basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Net gain on dispositions Net gain on dispositions Net gain on dispositions Gain (Loss) On Disposition Gain or loss on disposition of assets, including property, plant and equipment, tangible and intangible assets, and equity method investments. Performance Guarantee Performance Guarantee [Member] Accrued income and other taxes Taxes Payable, Current Investments in Rabbi trust assets and in NOVONIX Investments, Fair Value Disclosure Intangibles 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] Net Income Net Income 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] Total fair value gross liabilities Liabilities, Fair Value Disclosure Business Combination [Table] Business Combination [Table] Organization, Consolidation and Presentation of Financial Statements [Abstract] Indemnifications Indemnification Agreement [Member] Total Derivative, Fair Value, Amount Offset Against Collateral, Net [Abstract] Difference in Carrying Value and Fair Value Derivative Asset, Difference In Carrying Value And Fair Value Derivative Asset, Difference In Carrying Value And Fair Value Guarantor Obligation [Table] Guarantor Obligation [Table] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Accum. D&A Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization City Area Code City Area Code Acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Investments, Loans and Long-Term Receivables Investment [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] Stockholders' Equity, Shares [Roll Forward] Stockholders' Equity, Shares [Roll Forward] Stockholders' Equity, Shares [Roll Forward] Contingencies and Commitments Commitments and Contingencies, Policy [Policy Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Damages awarded, pre-judgment interest, percentage Loss Contingency, Damages Awarded, Pre-Judgment Interest, Percentage Loss Contingency, Damages Awarded, Pre-Judgment Interest, Percentage Refining Refining Segment [Member] Refining Segment [Member] 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 (Used in) Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Debt instrument, term Debt Instrument, Term Related Party Transactions [Abstract] Related Party Transactions [Abstract] Floating-rate debt Floating Rate Debt [Member] Floating Rate Debt [Member] Receivables Securitization Facility Receivables Securitization Facility due September 2025 at 5.182% at year-end 2024 Receivables Securitization Facility Due September [Member] Receivables Securitization Facility Due September Amortization of net actuarial loss (gain) Defined Benefit Plan, Amortization of Gain (Loss) Natural gas (billions of cubic feet) Natural Gas [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Goodwill Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Purchases Purchases [Member] Purchases Depreciation Depreciation Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Prepaid expenses and other current assets Prepaid Expenses and Other Current Assets [Member] Liabilities Derivative liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset Transfer of accumulated depreciation and amortization between segments Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization, Transfers Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization, Transfers Out (In) Equity Components [Axis] Equity Components [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Carrying value of net properties, plants and equipment (PP&E) and intangible assets, estimated salvage value Properties, Plants And Equipment, Net And Intangible Assets ,Net, Salvage Value Salvage Value Of Property, Plants And Equipment, Net And Intangible Assets ,Salvage Value Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Accounts Receivable Factoring Transfers and Servicing of Financial Assets [Text Block] Inventory Business Combination, Recognized Asset Acquired, Inventory, Current Revenue from External Customer [Line Items] Revenue from External Customer [Line Items] DCP Midstream Class A Segment Variable Interest Entity Disclosure [Text Block] Other Performance Measure, Amount Other Performance Measure, Amount Joint venture debt obligations, period (up to) Guarantor Obligations, Remaining Term Guarantor Obligations, Remaining Term Short-term debt Debt, Current Entity Address, State or Province Entity Address, State or Province M&S Marketing & Speciality Segment [Member] Marketing & Speciality Segment Payment term of receivables (in days) Payment Term Of Receivables Payment term of receivables. Related Party [Domain] Related and Nonrelated Parties [Domain] Total Current Liabilities Liabilities, Current Total acquisition consideration Business Combination, Consideration Transferred and Preacquisition Equity Interest in Acquiree Derivative Instrument Risk [Axis] Derivative Instrument [Axis] Individual: Individual [Axis] Asset retirement obligations and accrued environmental costs Business Combination, Recognized Liability, Asset Retirement Obligations And Accrued Environmental Costs Business Combination, Recognized Liability, Asset Retirement Obligations And Accrued Environmental Costs Gross PP&E Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Recurring Fair Value Measurements Fair Value of Financial Instruments, Policy [Policy Text Block] Dividends paid on common stock Payments of Ordinary Dividends, Common Stock Capital in excess of par Additional Paid in Capital, Common Stock Damages awarded, exemplary damages Loss Contingency, Damages Awarded, Exemplary Damages, Value Loss Contingency, Damages Awarded, Exemplary Damages, Value Entity [Domain] Entity [Domain] Investments In and Advances to Affiliates Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Facilities Facilities [Member] Facilities [Member] Net Cash Provided by (Used in) Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Remaining performance obligation life Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 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] Contributions from noncontrolling interests Proceeds from Noncontrolling Interests Document Fiscal Year Focus Document Fiscal Year Focus Maximum loss exposure Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Effective tax rate, percent Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Net Carrying Value Presented on the Balance Sheet Reported Value Measurement [Member] Customer contracts, term Customer Contracts, Term Customer Contracts, Term Taxes other than income taxes Taxes other than income taxes Taxes, Miscellaneous Equity [Abstract] Equity [Abstract] Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Sale of accounts receivable Consideration Received for Beneficial Interest Obtained for Transferring Financial Asset Segment Disclosures and Related Information Segment Reporting Disclosure [Text Block] 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] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Credit Losses Allowance for Credit Losses [Text Block] Lease Arrangement, Type [Axis] Long-Lived Tangible Asset [Axis] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Transfer of gross PP&E between segments Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization, Transfers Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization, Transfers Net Carrying Value Presented on the Balance Sheet Derivative, Fair Value, Amount Offset Against Collateral, Net Schedule of Components of Net Periodic Benefit Cost Schedule of Net Benefit Costs [Table Text Block] Residual Value Guarantees Residual Value Guarantees [Member] Residual Value Guarantees [Member] Other long-term liabilities Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Weighted Average Weighted Average [Member] Selling, general and administrative expenses Selling, General and Administrative Expense Schedule of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization Other assets Other Assets, Noncurrent Entity Central Index Key Entity Central Index Key Settlements Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 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] Supplemental Cash Flow Elements [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Revolving Credit Facility Revolving Credit Facility [Member] Defined Benefit Plan [Table] Defined Benefit Plan [Table] Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Segments [Axis] Segments [Axis] Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Materials and supplies Other Inventory, Net of Reserves Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Other Payment for (Proceeds from) Other Investing Activity Intangibles Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill Services and other Other Product Line [Member] Other Product Line [Member] Assets Assets [Abstract] Receivables Securitization Facility Receivables Securitization Facility [Member] Receivables Securitization Facility Credit Facility [Axis] Credit Facility [Axis] Nonrelated Party Nonrelated Party [Member] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Statement of Financial Position Location, Balance [Axis] Statement of Financial Position Location, Balance [Axis] Components of Net Periodic Benefit Cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Debt Instrument [Axis] Debt Instrument [Axis] Other income Nonoperating Income (Expense) [Member] Pension and Postretirement Plans Retirement Benefits [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Costs and Expenses Costs and Expenses Cost And Expenses [Abstract] Cost and expenses. 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 Repurchase of common stock Treasury Stock, Value, Acquired, Cost Method Accum. Other Comprehensive Loss Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Debt interest rate Debt Instrument, Interest Rate, Stated Percentage Investment, Name [Axis] Investment, Name [Axis] Allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Rabbi trust assets Rabbi Trust Assets [Member] Rabbi Trust Assets [Member] Assets Commodity Derivative Assets Derivative Asset, Subject to Master Netting Arrangement, before Offset 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 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) Effect of share-based compensation (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Related Party Transaction [Line Items] Related Party Transaction [Line Items] Variable Rate Component Two Variable Rate Component Two [Member] Variable Rate Component Two Document Quarterly Report Document Quarterly Report Variable Rate Component [Axis] Variable Rate Component [Axis] Variable Rate Component Total Fair Value of Gross Assets & Liabilities Assets, Fair Value Disclosure Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Energy [Axis] Energy [Axis] Accounts receivable, held-for-sale Accounts Receivable, Held-for-Sale Guarantees Guarantees [Text Block] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Railcar and Airplane Railcar and Airplane [Member] Railcar and Airplane [Member] Germany GERMANY Consolidating Adjustments excluding Corporate Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Interest cost Defined Benefit Plan, Interest Cost Related Party [Axis] Related and Nonrelated Parties [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Interest and debt expense Interest and Debt Expense Amortization of net actuarial loss and settlements Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Restatement Determination Date: Restatement Determination Date [Axis] Payments to acquire businesses, gross Cash paid to Cenovus Payments to Acquire Businesses, Gross Non-PEO NEO Non-PEO NEO [Member] Performance obligations secured by letters of credit and bank guarantees Letters of Credit Outstanding, Amount Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Contributions from noncontrolling interests Noncontrolling Interest, Increase from Subsidiary Equity Issuance Position [Domain] Position [Domain] Other Proceeds from (Payment for) Other Financing Activity Interest Income Interest Income, Other Difference in Carrying Value and Fair Value Derivative Liability, Difference In Carrying Value And Fair Value Derivative Liability, Difference In Carrying Value And Fair Value Accumulated Other Comprehensive Income Loss [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Amounts reclassified from accumulated other comprehensive loss Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax JET Management Holding JET Management Holding [Member] JET Management Holding WRB Refining LP WRB Refining LP WRB Refining LP [Member] WRB Refining LP Member Schedule of Offsetting Assets Offsetting Assets [Table Text Block] 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] Other Other Noncash Income (Expense) Taxes and other accruals Increase (Decrease) In Taxes And Other Accruals Net increase (decrease) during the reporting period in current income taxes, other accruals payable and other expenses incurred but not yet paid. This element includes items where no more specific or appropriate element exists. Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Net Carrying Value Presented on the Balance Sheet Asset, Fair Value Amount Offset Against Collateral Asset, Fair Value Amount Offset Against Collateral Compensation Amount Outstanding Recovery Compensation Amount Debt issued and guaranteed Debt issued aggregate principal Debt Instrument, Face Amount Other joint ventures and entities Other Joint Ventures [Member] Other Joint Ventures[Member] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Income taxes on defined benefit plans Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Operating revenues and other income Operating Revenue And Other Income [Member] Operating Revenue And Other Income Foreign currency derivative Foreign Exchange Contract [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Settlement of relationships with Phillips 66 and WRB Business Combination, Consideration Transferred, Equity Interest MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Assets Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral Name Awards Close in Time to MNPI Disclosures, Individual Name Accumulated other comprehensive income (loss) AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Energy [Domain] Energy [Domain] Operating expenses and selling, general and administrative expenses Operating Expenses And Selling, General And Administrative Expenses [Member] Operating Expenses And Selling, General And Administrative Expenses Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Revenues and Other Income Revenues and Other Income Revenues [Abstract] Credit Loss [Abstract] Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Long-term debt Long-Term Debt and Lease Obligation Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Financial Instruments [Domain] Financial Instruments [Domain] Litigation Case [Axis] Litigation Case [Axis] Segments [Domain] Segments [Domain] Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Axis] Damages sought Loss Contingency, Damages Sought, Value Gulf Coast Express LLC Gulf Coast Express LLC [Member] Gulf Coast Express LLC Asset retirement obligations Business Combination, Recognized Liabilities Assumed, Asset Retirement Obligations Business Combination, Recognized Liabilities Assumed, Asset Retirement Obligations Changes in accumulated other comprehensive income (loss) by component Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Variable Rate Component [Domain] Variable Rate Component [Domain] Variable Rate Component [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Damages awarded, post-judgment interest, percentage Loss Contingency, Damages Awarded, Post-Judgment Interest, Percentage Loss Contingency, Damages Awarded, Post-Judgment Interest, Percentage Marketing and Specialties Marketing And Specialties Segment [Member] Marketing And Specialties Segment [Member] Statement of Financial Position Location, Balance [Domain] Statement of Financial Position Location, Balance [Domain] Inventories Increase (Decrease) in Inventories Inventories Inventories Inventory, Net Sales-Quarter Quarterly Sales [Member] Quarterly Sales Minimum Minimum [Member] Income allocated to participating securities Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted Assets Derivative Asset [Abstract] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Company Selected Measure Name Company Selected Measure Name Employee benefit obligations Employee Benefit Obligations Current Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Excludes payroll taxes which are presented elsewhere in the balance sheet. Environmental accruals for known contaminations Total environmental accrual Accrual for Environmental Loss Contingencies Fair Value Measurement [Domain] Fair Value Measurement [Domain] Assets Effect of Counterparty Netting Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Senior Notes Senior Notes [Member] Debt Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Fixed-rate debt, excluding finance leases and software obligations Fixed Rate Debt Excluding Finance Leases And Software Obligations [Member] Fixed Rate Debt Excluding Finance Leases And Software Obligations Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Net income available to common stockholders Net Income (Loss) Available to Common Stockholders, Diluted All Executive Categories All Executive Categories [Member] Schedule of Fair Value Hierarchy for Material Financial Instruments and Derivative Assets and Liabilities, Including the Effect of Counterparty Netting Schedule Of Fair Value, Assets And Liabilities And Offsetting Assets And Liabilities [Table Text Block] Tabular disclosure of assets and liabilities, including financial instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Also disclosure of information about derivative and financial liabilities that are subject to offsetting, including enforceable master netting arrangements. Common stock (2,500,000,000 shares authorized at $0.01 par value) Issued (2025—659,131,505 shares; 2024—656,987,861 shares) Par value Common Stock, Value, Issued Restructuring Plan [Domain] Restructuring Plan [Domain] Undistributed equity earnings Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Contingencies and Commitments Commitments and Contingencies Disclosure [Text Block] Damages awarded, pre-judgment interest Loss Contingency, Damages Awarded, Pre-Judgment Interest, Value Loss Contingency, Damages Awarded, Pre-Judgment Interest, Value Diluted (in shares) Weighted-average commons shares outstanding - EPS (in shares) Weighted Average Number of Shares Outstanding, Diluted Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Derivative [Table] Derivative [Table] Extension term Line Of Credit Facility, Extension Term Line Of Credit Facility, Extension Term Business Combination [Axis] Business Combination [Axis] Comprehensive Income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Entity Small Business Entity Small Business Exchange-cleared instruments Exchange Cleared [Member] Business combination, voting equity interest acquired, percentage Business Combination, Voting Equity Interest Acquired, Percentage Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Operating expenses Other Cost and Expense, Operating Noncontrolling Interests Noncontrolling Interest [Member] Commitment fee Line of Credit Facility, Commitment Fee Amount Document Transition Report Document Transition Report Other long-term assets Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent Percentage of ownership interest Equity investment (as a percent) Equity Method Investment, Ownership Percentage Underlying Securities Award Underlying Securities Amount Reduction in borrowings under Receivables Securitization Facility Notes Reduction Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Income Taxes Income Tax Disclosure [Text Block] Diluted Earnings Per Share, Diluted [Abstract] Refined petroleum products and renewable fuels Refined Petroleum Products and Renewable Fuels [Member] Refined Petroleum Products and Renewable Fuels United Kingdom UNITED KINGDOM Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Income before income taxes Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax Debt Debt Instrument, Fair Value Disclosure Net Carrying Value Presented on the Balance Sheet Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Deferred tax liabilities Business Combination, Recognized Liability Assumed, Deferred Tax Liability LIFO inventory amount LIFO Inventory Amount Total Equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Number of refineries Number Of Petroleum Refineries Number Of Petroleum Refineries Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Line of credit facility, increase limit Line Of Credit Facility, Accordion Feature, Increase Limit Line Of Credit Facility, Accordion Feature, Increase Limit Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Defined benefit plans, net of income taxes Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Investment in NOVONIX Investment in NOVONIX [Member] Investment in NOVONIX Net Carrying Value Presented on the Balance Sheet Net Carrying Value Presented on the Balance Sheet Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Product and Service [Axis] Product and Service [Axis] Domestic Plan Domestic Plan [Member] Derivative Contract Type [Domain] Derivative Contract [Domain] Issuance of common stock Proceeds from Issuance of Common Stock Sales and other operating revenues Sales and other operating revenues Total sales and other operating revenues Revenue from Contract with Customer, Excluding Assessed Tax CPChem CPChem [Member] CPChem. All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Accounts and notes receivable Increase (Decrease) in Receivables Name Forgone Recovery, Individual Name Benefit plan activity Total Adjustments To Equity From Share Based Compensation Total adjustments to equity resulting from share-based compensation plans, including the value of stock (or other type of equity award) earned during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any value of such awards forfeited, plus the increase in APIC resulting from the tax benefits associated with such share-based awards, including, but not limited to, excess tax benefit, less dividend equivalents paid to or declared for holders of share-based awards. Total Current Assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] 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] Proceeds from sale of finance receivables Proceeds from Sale of Finance Receivables Loss contingency accrual Loss Contingency Accrual Before-tax gain Equity Method Investment, Realized Gain (Loss) on Disposal Weighted-average common shares outstanding (in shares) Weighted Average Number of Shares Issued, Basic Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount The Facility The Facility [Member] The Facility Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Net income available to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Line of credit facility, maximum borrowing capacity, increase Line Of Credit Facility, Maximum Borrowing Capacity, Increase Line Of Credit Facility, Maximum Borrowing Capacity, Increase Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Geographical [Axis] Geographical [Axis] Transaction Type [Axis] Transaction Type [Axis] Liabilities Derivative Liability [Abstract] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Interim Financial Information [Abstract] Interim Financial Information [Abstract] Interim Financial Information [Abstract] Level 1 Fair Value, Inputs, Level 1 [Member] Amount borrowed Long-Term Line of Credit Foreign currency transaction (gains) losses Gain (Loss), Foreign Currency Transaction, before Tax Related Party Transaction [Table] Related Party Transaction [Table] Diluted (in usd per share) Earnings Per Share of Common Stock (in usd per share) Earnings Per Share, Diluted Income allocated to participating securities Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Accounts and notes receivable Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current Title of 12(b) Security Title of 12(b) Security Cash proceeds Proceeds From Sale Of Equity Method Investment And Annual Dividends Proceeds From Sale Of Equity Method Investment And Annual Dividends Additional contributions expected to be made during remainder of fiscal year Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year Coop Mineraloel AG Coop Mineraloel AG [Member] Coop Mineraloel AG Receivables outstanding Transfer of Financial Assets Accounted for as Sales, Amount Derecognized Accounts Receivables Securitization Facility Accounts Receivables Securitization Facility [Member] Accounts Receivables Securitization Facility Treasury stock (in shares) Beginning balance, treasury stock (in shares) Ending balance, treasury stock (in shares) Treasury Stock, Common, Shares Net Income Attributable to Phillips 66 Per Share of Common Stock (dollars) Earnings Per Share [Abstract] Earnings Per Share [Abstract] Restructuring Plan [Axis] Restructuring Plan [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Other income Nonoperating Income (Expense) Return of investments in equity affiliates Proceeds from Equity Method Investment, Distribution, Return of Capital Effect of share-based compensation (in shares) Weighted Average Number of Shares, Contingently Issuable Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Maximum exposure, undiscounted Maximum Exposure, Undiscounted Maximum Exposure, Undiscounted Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Purchased crude oil and products Cost Of Goods And Services Sold [Member] Cost Of Goods And Services Sold Commodity Derivatives Commodity [Member] Repurchase of common stock (in shares) Treasury Stock, Shares, Acquired Award Timing Disclosures [Line Items] Natural gas liquids and natural gas Natural Gas Liquids (NGL) [Member] Each borrowing maturity, period Line Of Credit Facility, Borrowing Maturity, Period Line Of Credit Facility, Borrowing Maturity, Period Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Service cost Defined Benefit Plan, Service Cost Borrowings outstanding Long-Term Debt, Gross Properties, Plants and Equipment Property, Plant and Equipment Disclosure [Text Block] Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Net properties, plants and equipment Net PP&E Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Distributions to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Net Income Attributable to Phillips 66 Net Income (Loss) Attributable to Parent Intercompany revenues Intersegment Eliminations [Member] Expiration Date Trading Arrangement Expiration Date Significant transactions with related parties Related Party Transaction, Amounts of Transaction Equity Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Unrealized investment loss Equity Securities, FV-NI, Unrealized Gain (Loss) Net properties, plants and equipment Property, Plant and Equipment, Net Repayment of debt Repayments of Debt and Lease Obligation Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Repurchase of common stock 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] Net loss from commodity derivative activity Gain (Loss) on Price Risk Derivative Instruments Not Designated as Hedging Instruments Joint Venture Debt Obligation Guarantees Joint Venture Debt Obligation Guarantees [Member] Joint Venture Debt Obligation Guarantees Entity Current Reporting Status Entity Current Reporting Status Consolidating Adjustments Consolidation, Eliminations [Member] Derivative [Line Items] Derivative [Line Items] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Revenue from External Customers by Products and Services [Table] Segment Reporting, Revenue from External Customer, Product and Service [Table] Consolidated Entities [Domain] Consolidated Entities [Domain] Line of Credit Line of Credit [Member] Schedule of Offsetting Liabilities Offsetting Liabilities [Table Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Accounts Receivable Securitization Sales [Axis] Accounts Receivable Securitization Sales [Axis] Accounts Receivable Securitization Sales Transaction [Domain] Transaction [Domain] Financial Instrument [Axis] Financial Instrument [Axis] Adjustments to reconcile net income to net cash provided by operating activities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] 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] Repayments of debt Repayments of Debt Total Costs and Expenses Cost And Expenses Total costs and expenses, including operating expenses and non-operating expenses. Other comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Current Fiscal Year End Date Current Fiscal Year End Date Hedging Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Net working capital deficit 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] WRB Acquisition WRB Acquisition [Member] WRB Acquisition 2025 Uncommitted Facility Uncommitted Facility 2025 [Member] Uncommitted Facility 2025 Retirement Plan Type [Axis] Retirement Plan Type [Axis] Statement [Table] Statement [Table] Other countries Other Geographical Areas [Member] Other Geographical Areas [Member] Schedule of Fair Value of Consideration Transferred and Amounts Included in Operations Business Combination [Table Text Block] Effect of Exchange Rate Changes on Cash and Cash Equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Deferred income taxes Deferred Income Tax Expense (Benefit) Vanessa A. Sutherland [Member] Vanessa A. Sutherland 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] Estimated excess of current replacement cost over LIFO cost of inventories Excess of Replacement or Current Costs over Stated LIFO Value Crude oil, refined petroleum products, NGL and renewable feedstocks (millions of barrels) Crude Oil, Refined Petroleum Products, NGL and Renewable Feedstocks [Member] Crude Oil, Refined Petroleum Products, NGL and Renewable Feedstocks Assumed dividend Proceeds from Equity Method Investment, Distribution Contract with customer, liability Contract with Customer, Liability Investments and long-term receivables Long-Term Investments and Receivables, Net Weighted-Average Common Shares Outstanding (thousands) Weighted Average Number of Shares Outstanding, Diluted [Abstract] All Adjustments to Compensation All Adjustments to Compensation [Member] Liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral Amendment Flag Amendment Flag Other liabilities and deferred credits Deferred Credits and Other Liabilities, Noncurrent Other Benefits Other Postretirement Benefits Plan [Member] Transfers and Servicing [Abstract] Treasury stock (at cost: 2026—259,986,676 shares; 2025—258,252,603 shares) Treasury Stock, Common, Value Termination Date 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] Defined benefit plans Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract] Contract with customer, asset Contract with Customer, Asset, before Allowance for Credit Loss Coastal Bend Coastal Bend [Member] Coastal Bend Lease Arrangement, Type [Domain] Long-Lived Tangible Asset [Domain] Basic (in shares) Weighted-average commons shares outstanding - EPS (in shares) Weighted-average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Purchased crude oil and products Purchased crude oil and products Cost of Product and Service Sold Amortization of net actuarial loss and settlements Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] Other liabilities and deferred credits Other Liabilities And Deferred Credits [Member] Other Liabilities And Deferred Credits [Member] Schedule of Reconciliation of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Related Party Transaction [Domain] Related Party Transaction [Domain] 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 Assets that Continue to be Recognized, Securitized or Asset-Backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items] Assets that Continue to be Recognized, Securitized or Asset-Backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items] Entity Tax Identification Number Entity Tax Identification Number Dakota Access, LLC Dakota Access, LLC [Member] Dakota Access, LLC [Member] Proceeds from sale of ownership interests Equity Method Investment, Amount Sold 2024 Uncommitted Facility 2024 Uncommitted Facility [Member] 2024 Uncommitted Facility Accounts receivable, before allowance for credit loss Accounts Receivable, before Allowance for Credit Loss Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Schedule of Fair Value of Commodity Derivative Assets and Liabilities and Gains (Losses) from Derivative Contracts Schedule of Price Risk Derivatives [Table Text Block] Post-trial motions filed Loss Contingency, Number Of Post-Trial Motions Filed Loss Contingency, Number Of Post-Trial Motions Filed Plans sponsored by equity affiliates Other Comprehensive Income (Loss), Defined Benefit Plan, Non Sponsored Plans, Reclassification Adjustment From AOCI, Before Tax The pre-tax change in other comprehensive income related to benefit plans for which the reporting entity is not the primary obligor - primarily those administered by equity affiliates. Accounts payable Accounts Payable, Trade, Current Accounts Receivable Securitization Sales [Domain] Accounts Receivable Securitization Sales [Domain] Accounts Receivable Securitization Sales [Domain] OnCue Holdings, LLC OnCue Holdings, LLC [Member] OnCue Holdings, LLC [Member] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Consolidated Entities [Axis] Consolidated Entities [Axis] Short Short [Member] Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Common Stock, Shares, Issued Common stock issued (in shares) Beginning balance, common stock issued (in shares) Ending balance, common stock issued (in shares) Common Stock, Shares, Issued 3.605% Senior Notes due February 2025 3.605% Senior Notes Due February 2025 [Member] 3.605% Senior Notes Due February 2025 Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Trading Arrangement: Trading Arrangement [Axis] Difference in Carrying Value and Fair Value Difference In Carrying Value And Fair Value Liability The amount by which the aggregate fair value of the liability exceeds (or is less than) the carrying value. Total Shareholder Return Amount Total Shareholder Return Amount Liabilities Effect of Counterparty Netting Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Accounts and notes receivable (net of allowances of $66 million in 2026 and $68 million in 2025) Accounts and Financing Receivable, after Allowance for Credit Loss, Current Foreign currency translation adjustments, net of income taxes Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Insider Trading Arrangements [Line Items] Corporate and Other Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Security Exchange Name Security Exchange Name Total Liabilities Liabilities Distributions to noncontrolling interests Payments of Ordinary Dividends, Noncontrolling Interest Other accruals Other Accruals [Member] Other accruals member. Term Loan Agreement Term Loan Agreement [Member] Term Loan Agreement Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Other accruals Other Liabilities, Current Employee benefit obligations Liability, Defined Benefit Plan, Noncurrent Number of reportable segments not disclosed flag NumberOfReportableSegmentsNotDisclosedFlag NumberOfReportableSegmentsNotDisclosedFlag Fair value of previously held equity interest in WRB Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Fair Value 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 Chemicals Chemicals Chemicals Segment [Member] Chemicals segment. Par Value Common Stock [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Crude oil and products Energy Related Inventory, Crude Oil, Products and Merchandise Net Change in Cash and Cash Equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Net Carrying Value Presented on the Balance Sheet Financial And Nonfinancial Liability, Fair Value, Amount Offset Against Collateral Financial And Nonfinancial Liability, Fair Value, Amount Offset Against Collateral