Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Asset retirement obligations and accrued environmental costs due within one year Asset Retirement Obligation And Accrual For Environmental Loss Contingencies, Current Current portion of the carrying amount of a liability for an asset retirement obligation and total costs accrued as of the balance sheet date for environmental loss contingencies. Disposition Of Coop Effective Income Tax Rate Reconciliation, Disposition Of Foreign Equity Investment, Amount Effective Income Tax Rate Reconciliation, Disposition Of Foreign Equity Investment, Amount Non-taxable gain on disposition Effective Income Tax Rate Reconciliation, Disposition of Business, Amount Commodity derivatives Commodity Derivative Assets Commodity Contract [Member] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Schedule of Expected Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Aggregate amounts of estimated payments under long-term throughput and take-or-pay agreements - 2029 Unrecorded Unconditional Purchase Obligation, to be Paid, Year Five Asset retirement balance increase for the period Asset Retirement Obligation, Period Increase (Decrease) Award Timing Predetermined Award Timing Predetermined [Flag] Crude Oil Pipeline Crude Oil Pipeline [Member] Crude Oil Pipeline Indefinite-lived Intangible Assets by Major Class [Axis] Indefinite-Lived Intangible Assets [Axis] Less: Foreign currency forward contract loss Disposal Group Including Discontinued Operations, Gain (Loss) On Foreign Currency Forward Contracts Disposal Group Including Discontinued Operations, Gain (Loss) On Foreign Currency Forward Contracts Entity File Number Entity File Number Capital in Excess of Par Additional Paid-in Capital [Member] Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount 4.950% Senior Notes due March 2035 4.950% Senior Notes Due March 2035 [Member] 4.950% Senior Notes Due March 2035 Tabular List, Table Tabular List [Table Text Block] Target allocations for plan assets (as a percent) Defined Benefit Plan, Plan Assets, Target Allocation, Percentage New Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] 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] Maximum exposure of loss/potential amount of future payments Guarantor Obligations, Maximum Exposure, Undiscounted Debt instrument covenant, debt to capitalization ratio (as a percent) Debt Instrument Covenant, Debt To Capitalization Ratio Debt Instrument Covenant, Debt To Capitalization Ratio Goodwill [Line Items] Goodwill [Line Items] Position [Axis] Position [Axis] Measurement Basis [Axis] Measurement Basis [Axis] Adjustment to Compensation: Adjustment to Compensation [Axis] Interest crediting rate on cash balance plan Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Interest Crediting Rate, Cash Balance Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Interest Crediting Rate, Cash Balance Related Party Transactions Related Party Transactions Disclosure [Text Block] 2.150% Senior Notes due December 2030 2.150% Senior Notes due December 2030 [Member] 2.150% Senior Notes due December 2030 Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Sales and Other Operating Revenues Revenue from Contract with Customer [Text Block] North Dakota Pipeline And Terminal Assets North Dakota Pipeline And Terminal Assets [Member] North Dakota Pipeline And Terminal Assets Stock, Class of Stock [Table] Stock, Class of Stock [Table] Effect of Collateral Netting Effect of Collateral Netting Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Intangible Asset, Indefinite-Lived [Table] Intangible Asset, Indefinite-Lived [Table] Expected future undiscounted payments, due for all future years after 2030 Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, after Year Five Adjustment to Compensation, Amount Adjustment to Compensation Amount Pension Benefits Pension Plan [Member] Net unamortized discounts, debt issuance costs and acquisition fair value adjustments Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Oklahoma OKLAHOMA Consolidation Principles and Investments Consolidation, Policy [Policy Text Block] Notional amount Derivative Asset, Notional Amount Stock options Share-Based Payment Arrangement, Option [Member] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Net working capital deficit Business Combination, Net Working Capital Business Combination, Net Working Capital Impairment of Properties, Plants and Equipment Property, Plant and Equipment, Impairment [Policy Text Block] Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Finance Lease, Liability, Noncurrent, Statement of Financial Position Flag Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] 4.875% Senior Notes due November 2044 4.875% Senior Notes due November 2044 [Member] 4.875% Senior Notes due November 2044 Health care cost trend rate, ultimate (as a percent) Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Dividends paid on common stock Dividends, Common Stock, Cash Total Stockholders’ Equity Equity, Attributable to Parent Impairments Impairments Impairment charges Asset Impairment Charges Insider Trading Policies and Procedures [Line Items] Schedule of Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized State and Local Jurisdiction State and Local Jurisdiction [Member] Cover [Abstract] Cover [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Maximum Maximum [Member] Less: net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Rate of compensation increase Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Net amortized intangible asset balance Finite-Lived Intangible Assets, Net Number of classes of membership created Number Of Classes Of Membership Created Number Of Classes Of Membership Created Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Divestiture Divestiture Defined Benefit Plan, Plan Assets, Divestiture Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Corporate Reconciling Items And Eliminations Corporate Reconciling Items And Eliminations [Member] Corporate Reconciling Items And Eliminations Corporate And Other Eliminations Corporate And Eliminations [Member] Corporate And Eliminations Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Debt at face value Debt, Long-Term and Short-Term, Combined Amount Gray Oak Pipeline LLC Gray Oak Pipeline LLC [Member] Gray Oak Pipeline LLC [Member] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Series B Preferred Stock Series B Preferred Stock [Member] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Other assets Other Assets [Member] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Commodity Derivative, Nonmonetary Notional Amount, Volume Entity Shell Company Entity Shell Company Shares Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract] Environmental Remediation Site [Domain] Environmental Remediation Site [Domain] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Issuance of debt 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 Performance Share Program Activity Share-Based Payment Arrangement, Performance Shares, Activity [Table Text Block] 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 (in years) (up to) Lessee, Operating Lease, Remaining Lease Term 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] Asset Retirement Obligations Asset Retirement Obligation [Policy Text Block] Discount on purchased credits Effective Income Tax Rate Reconciliation, Tax Exempt Income, Discount On Purchased Credits, Amount Effective Income Tax Rate Reconciliation, Tax Exempt Income, Discount On Purchased Credits, Amount Vested Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Intrinsic Value Receivables Securitization Facility due September 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 Los Angeles Refinery [Member] Los Angeles Refinery Net Income Attributable to Phillips 66 Net Income Attributable to Phillips 66 Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent United States Income (Loss) from Continuing Operations before Income Taxes, Domestic Other accruals Operating Lease, Liability, Current Non-taxable or non-deductible items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent [Abstract] Interest on lease liabilities Finance Lease, Interest Expense Document Fiscal Period Focus Document Fiscal Period Focus Rate of compensation increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] Derivatives, Fair Value [Line Items] 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 [Axis] Award Type [Axis] Foreign Currency Translation Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Investment, Name [Domain] Investment, Name [Domain] Investment, Name [Domain] Share-Based Compensation Share-Based Payment Arrangement [Policy Text Block] Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Business Combinations Business Combination [Policy Text Block] United States Income (Loss) From Continuing Operations Before Income Taxes Domestic Percentage Of Total Income (Loss) From Continuing Operations Before Income Taxes1 The percentage of earnings (loss) from continuing operations before income taxes attributable to domestic operations. Changes in valuation allowances Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Shares issued—share-based compensation (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Address, City or Town Entity Address, City or Town Securitization Facility Securitization Facility [Member] Securitization Facility Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Debt interest rate reset, period Debt Instrument, Interest Rate Reset, Period Debt Instrument, Interest Rate Reset, Period Weighted-average discount rate—finance leases Finance Lease, Weighted Average Discount Rate, Percent Awards Granted in 2023 Awards Granted In 2023 [Member] Awards Granted In 2023 Effect of Exchange Rate Changes on Cash and Cash Equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Net deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Foreign currency exchange rate change Foreign currency exchange rate change Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Restricted stock units Restricted Stock Units (RSUs) [Member] Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] 3.900% Senior Notes due March 2028 3.900% Senior Notes due March 2028 [Member] 3.900% Senior Notes due March 2028 Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Damages awarded Loss Contingency, Damages Awarded, Value NGL Pipeline in Texas NGL Pipeline in Texas [Member] NGL Pipeline in Texas Total consideration Business Combination, Consideration Transferred Length of construction period for interest capitalization (in years) Construction Period For Interest Capitalization Treatment Construction Period For Interest Capitalization Treatment Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] Renewable Fuels Renewable Fuels Renewable Fuels [Member] Renewable Fuels Equity method investment impairment Equity Method Investment, Other-than-Temporary Impairment Entity Emerging Growth Company Entity Emerging Growth Company Long-term borrowing maturities, 2027 Long-Term Debt, Maturity, Year Three 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 3.150% Senior Notes due December 2029 3.150% Senior Notes due December 2029 [Member] 3.150% Senior Notes due December 2029 Weighted-average remaining lease term—finance leases (years) Finance Lease, Weighted Average Remaining Lease Term Outstanding at beginning balance (in shares) Outstanding at ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number 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] Aggregate principal amount intended to be redeemed Debt Instrument, Redemption, Principal Intended To Be Redeemed Debt Instrument, Redemption, Principal Intended To Be Redeemed 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. 2026 Defined Benefit Plan, Expected Future Benefit Payment, Year One Indefinite-lived intangible assets Indefinite-Lived Intangible Assets (Excluding Goodwill) Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign, Percentage of Total Income (Loss) from Continuing Operations before Income Taxes The percentage of earnings (loss) from continuing operations before income taxes attributable to foreign operations. Amount representing interest or discounts Finance Lease, Liability, Undiscounted Excess Amount Gulf Coast Express Pipeline LLC Gulf Coast Express Pipeline LLC [Member] Gulf Coast Express Pipeline LLC Net gain on dispositions Gain (Loss) on Disposition of Other Assets Defined benefit plans Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent [Abstract] Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] Assumptions Used to Determine Benefit Obligations: Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Accretion on discounted liabilities Accretion on discounted liabilities Accretion Expense, Including Asset Retirement Obligations Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Awards Granted in 2024 Awards Granted In 2024 [Member] Awards Granted In 2024 Noncurrent assets Assets for Plan Benefits, Defined Benefit Plan Decrease in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount DCP Midstream, LP DCP LP DCP Midstream, LP [Member] DCP Midstream, LP 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] Change in Benefit Obligations Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] 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 tax expense Income tax expense Income Tax Expense (Benefit) Debt instrument, basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Indirect economic interests Indirect Economic Interest, Percent Indirect Economic Interest, Percent 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. Income taxes on hedging activities Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Schedule of Impairments Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block] Hedging activities, net of income taxes Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax 5.650% Senior Notes due June 2054 5.650% Senior Notes Due June 2054 [Member] 5.650% Senior Notes Due June 2054 Weighted-average actual return on plan assets Defined Benefit Plan, Weighted-Average Actual Return On Plan Assets Defined Benefit Plan, Weighted-Average Actual Return On Plan Assets Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block] Indemnifications Indemnification Agreement [Member] Income before income taxes Percent of Pre-tax Income [Abstract] Percent of Pre-tax Income [Abstract] Treasury Stock Stockholders' Equity, Policy [Policy Text Block] 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] Other Income and Expenses [Abstract] Other Income and Expenses [Abstract] Restructuring Restructuring and Related Activities Disclosure [Text Block] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cumulative authorized amount Stock Repurchase Program, Cumulative Authorized Amount Stock Repurchase Program, Cumulative Authorized Amount Goodwill assigned to divestiture Goodwill, Acquired During Period Cash received from the exercise of options Proceeds from Stock Options Exercised Accum. D&A Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization Acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Federal Income Taxes Income Tax Paid, Federal, after Refund Received 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] Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Percentage of Total Income (Loss) from Continuing Operations before Income Taxes Percentage of earnings or loss from continuing operations before income taxes. Weighted-average remaining contractual terms of vested options (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Stockholders' Equity, Shares [Roll Forward] Stockholders' Equity, Shares [Roll Forward] Stockholders' Equity, Shares [Roll Forward] Non-taxable gain on disposition Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent Commitments and Contingencies Commitments and Contingencies, Policy [Policy Text Block] Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Stock units, not vested, end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Accumulated benefit obligations Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] 5.300% Senior Notes Due 2033 5.300% Senior Notes Due 2033 [Member] 5.300% Senior Notes Due 2033 Refining Refining Segment [Member] Refining Segment [Member] 4.950% Senior Notes due December 2027 4.950% Senior Notes Due December 2027 [Member] 4.950% Senior Notes Due December 2027 Deferred tax assets, operating loss carryforwards, foreign Deferred Tax Assets, Operating Loss Carryforwards, Foreign Net Cash Provided by Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Debt term (in days) Debt Instrument, Term Effective Income Tax Rate Reconciliation [Table] Effective Income Tax Rate Reconciliation [Table] Floating-rate debt Floating Rate Debt [Member] Floating Rate Debt [Member] Commercial paper due January 2026 at 3.952% at year-end 2025 Commercial Paper Due January 2025 [Member] Commercial Paper Due January 2025 Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Cash settled (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Cash Settlement, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Non-Option Equity Instruments, Cash Settlement, Weighted Average Grant Date Fair Value Par value of preferred stock, per share (in dollars per share) Preferred Stock, Par or Stated Value Per Share Useful life (in years) Property, Plant and Equipment, Useful Life Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Subsequent Event Subsequent Event [Member] Schedule of Fair Value Assumptions Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Equity Method Investment, Nonconsolidated Investee or Group of Investees Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] 5.850% Junior Subordinated Notes due May 2043 Junior Subordinated Notes due May 2043 [Member] Junior Subordinated Notes due May 2043 Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Depreciation Depreciation Weighted-average exercise price, vested at ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Cash settled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Cash Settlement Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Cash Settlement 2029 Finance Lease, Liability, to be Paid, Year Four Liabilities Total Fair Value of Gross Assets & Liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset Equity Components [Axis] Equity Components [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Sublease income Sublease Income Interest crediting rate on cash balance plan Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Interest Crediting Rate, Cash Balance Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Interest Crediting Rate, Cash Balance 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] Impaired Long-Lived Assets Held and Used [Line Items] Impaired Long-Lived Assets Held and Used [Line Items] Eligible retirement age Eligible Retirement Age Eligible retirement age Common units, distribution Common Units, Distributed Amount Common Units, Distributed Amount Deferred Tax Assets Components of Deferred Tax Assets [Abstract] Joint venture debt obligations, period (in years) (up to) Guarantor Obligations, Remaining Term Guarantor Obligations, Remaining Term Entity Address, State or Province Entity Address, State or Province Financing cash outflows—finance leases Finance Lease, Principal Payments 2029 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Total Current Liabilities Current liabilities Liabilities, Current Foreign Foreign Income Tax Expense (Benefit), Continuing Operations [Abstract] Inventory Deferred Tax Assets, Inventory Individual: Individual [Axis] Total expense related to participants in the savings plan Defined Contribution Plan, Cost Gross PP&E Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Cash proceeds received Proceeds from Divestiture of Interest in Consolidated Subsidiaries Class B Membership Class B Membership [Member] Class B Membership Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Loss (gain) on early redemption of debt Gain (Loss) on Repurchase of Debt Instrument Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Dividends paid on common stock Payments of Ordinary Dividends, Common Stock Document Annual Report Document Annual Report 5.500% Senior Notes due March 2055 5.500% Senior Notes Due March 2055 [Member] 5.500% Senior Notes Due March 2055 Cash and cash equivalents Defined Benefit Plan, Cash and Cash Equivalents [Member] Contributions from noncontrolling interests Proceeds from Noncontrolling Interests 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] Environmental Remediation Contingency [Axis] Environmental Remediation Contingency [Axis] Entity Interactive Data Current Entity Interactive Data Current Phillips 66 Partners LP Phillips 66 Partners Phillips 66 Partners LP [Member] Phillips 66 Partners LP [Member] Customer contracts, term (in years) Customer Contracts, Term Customer Contracts, Term NOVONIX NOVONIX Limited [Member] NOVONIX Limited Funded Status at December 31 Defined Benefit Plan, Funded (Unfunded) Status of Plan Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Credit Losses Allowance for Credit Losses [Text Block] Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Net Carrying Value Presented on the Balance Sheet Derivative, Fair Value, Amount Offset Against Collateral, Net Indirect economic interest Equity Method Investment, Indirect Economic, Percent Equity Method Investment, Indirect Economic, Percent Acquisition of Phillips 66 Partners Common Units Held by Public Acquisition Of Phillips 66 Partners Common Units Held By Public [Member] Acquisition Of Phillips 66 Partners Common Units Held By Public Ownership [Domain] Ownership [Domain] 2027 Finance Lease, Liability, to be Paid, Year Two Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Auditor [Table] Auditor [Table] 2027 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Other assets Other Assets, Noncurrent Entity Central Index Key Entity Central Index Key PEO Name PEO Name Revenues Revenues Asset retirement obligations Balance at January 1 Balance at December 31 Asset Retirement Obligation 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] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Defined Benefit Plan [Table] Defined Benefit Plan [Table] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Exercise period one Share-Based Payment Arrangement, Tranche One [Member] Non-taxable or non-deductible items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount [Abstract] Schedule of Other Financial Information Schedule of Other Operating Cost and Expense, by Component [Table Text Block] Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Federal statutory income tax Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Subsequent Event Type [Axis] Subsequent Event Type [Axis] Disposal group, including discontinued operation, consideration Disposal Group, Including Discontinued Operation, Consideration Loss contingency expenses Loss Contingency Accrual, Provision Number of pipelines Number Of Pipelines Number Of Pipelines Nonrelated Party Nonrelated Party [Member] Statement of Financial Position Location, Balance [Axis] Statement of Financial Position Location, Balance [Axis] Enbridge Inc Enbridge Inc [Member] Enbridge Inc Depreciation and Amortization Depreciation, Depletion, and Amortization [Policy Text Block] Vesting [Domain] Vesting [Domain] Other income Nonoperating Income (Expense) [Member] 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 Research and Development Expenses Research and Development Expense Accum. Other Comprehensive Loss Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Class Of Membership [Domain] Class Of Membership [Domain] Class Of Membership [Domain] Allowance for accounts and notes receivable Allowance for accounts and notes receivable Accounts Receivable, Allowance for Credit Loss, Current Receivables Securitization Facility due September 2026 at 4.538% at year-end 2025 Receivables Securitization Facility Due September 2025 [Member] Receivables Securitization Facility Due September 2025 Software obligations Software Obligations Software Obligations Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Ownership [Axis] Ownership [Axis] 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 Disposal Group, Held-for-Sale, Not Discontinued Operations Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] Changes in unrecognized tax benefits Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Level 1, 2 and 3 Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Spending on existing obligations Asset Retirement Obligation, Cash Paid to Settle Effect of share-based compensation (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Unrecognized compensation expense from unvested awards held by employees Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Related Party Transaction [Line Items] Related Party Transaction [Line Items] Percentage of ownership Percentage Of Ownership Percentage Of Ownership Change in Unrecognized Tax Benefit, Reasonably Possible [Table] Change in Unrecognized Tax 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An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Examples of environmental loss contingencies are presence of hazardous waste, relevant information from reports issued by regulators, and estimated costs to achieve compliance with regulatory requirements. Employee benefit obligations Noncurrent liabilities Liability, Defined Benefit Plan, Noncurrent NumberOfReportableSegmentsNotDisclosedFlag 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] Extinguishment of debt Extinguishment of Debt, Amount 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] Chemicals Chemicals Chemicals Segment [Member] Chemicals segment. Advanced Term Loan Agreement Advanced Term Loan Agreement [Member] Advanced Term Loan Agreement Marketing and Specialties Marketing and Specialties [Member] Marketing and Specialties Par Value Common Stock [Member] Stock option terms (in years) Deferred Compensation Arrangement with Individual, Maximum Contractual Term Intangible Assets Other Than Goodwill Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Finance Leases Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] 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 5.875% Series A Junior Subordinated Notes due March 2056 5.875% Series A Junior Subordinated Notes Due March 2056 [Member] 5.875% Series A Junior Subordinated Notes Due March 2056 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 1.300% Senior Notes due February 2026 1.300% Senior Notes Due February 2026 [Member] 1.300% Senior Notes Due February 2026 Member Net working capital Business Combination, Recognized Asset Acquired, Asset, Current Capitalized Interest Interest Capitalization, Policy [Policy Text Block] Dividends Paid Per Share of Common Stock (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Short-term debt Business Combination, Recognized Liability Assumed, Short-Term Debt Business Combination, Recognized Liability Assumed, Short-Term Debt Foreign currency translation Asset Retirement Obligation, Foreign Currency Translation Gain (Loss) Statistical Measurement [Domain] Statistical Measurement [Domain] Properties, plants and equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Remaining years Lessee, Operating Lease, Liability, to be Paid, after Year Five Schedule of Outstanding Commodity Derivative Contracts Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Operating Lease, Liability, Current, Statement of Financial Position Flag Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] 5.375% Senior Notes due July 2025 5.375% Senior Notes due July 2025 [Member] 5.375% Senior Notes due July 2025 Crude oil resales Crude Oil [Member] Propel Fuels Litigation Propel Fuels Litigation [Member] Propel Fuels Litigation Int’l. Foreign Plan [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] 5.625% Senior Notes due July 2027 5.625% Senior Notes due July 2027 [Member] 5.625% Senior Notes due July 2027 Other Financial Information Other Income and Other Expense Disclosure [Text Block] Equity in earnings of affiliates Income (Loss) from Equity Method Investments Compensating balance, amount Compensating Balance, Amount Leases [Abstract] Leases [Abstract] Additions for tax positions of prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Basic Earnings Per Share, Basic [Abstract] Real estate and infrastructure investments measured at NAV Defined Benefit Plan, Real Estate And Infrastructure [Member] Defined Benefit Plan, Real Estate And Infrastructure Noncash or Part Noncash Acquisitions [Table] Noncash or Part Noncash Acquisitions [Table] 3.605% Senior Notes due February 2025 3.605% Senior Notes due February 2025 [Member] 3.605% Senior Notes due February 2025 Accounts payable Increase (Decrease) in Accounts Payable Schedule of Disposal Groups, Including Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Type of Restructuring [Domain] Type of Restructuring [Domain] Income Statement Income (Loss) from Subsidiaries, Net of Tax [Abstract] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Basic (in dollars per share) Earnings Per Share of Common Stock (in dollars per share) Earnings Per Share, Basic Commercial Paper Commercial Paper [Member] Schedule of ROU Assets and Lease Liabilities Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Asset dispositions Asset Retirement Obligation, Liabilities Settled Fair value of plan assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets Changes in unrecognized tax benefits Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Award Date [Axis] Award Date [Axis] Total deferred tax assets Deferred Tax Assets, Gross Tax benefit from the exercise of options Share-Based Payment Arrangement, Exercise of Option, Tax Benefit Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Other Comprehensive Income (Loss), Net of Income Taxes Other comprehensive (loss) income 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] Short-term debt Short-Term Debt Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Remaining performance obligations Revenue, Remaining Performance Obligation, Amount Interest and Debt Expense Interest and Debt Expense [Abstract] Properties, plants and equipment, and intangibles Deferred Tax Liabilities, Property, Plant and Equipment and Intangible Assets Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment and intangible assets. Asset retirement obligations Changes in estimates of existing obligations Asset Retirement Obligation, Revision of Estimate Midstream Midstream Midstream Segment [Member] Midstream segment. Fair value of 35% retained interest in JET Management Holding Disposal group, not discontinued operations, equity method investment retained after disposal, fair value Disposal Group, Not Discontinued Operations, Equity Method Investment Retained after Disposal, Fair Value Disposal Group, Not Discontinued Operations, Equity Method Investment Retained after Disposal, Fair Value Impaired Long-Lived Asset, Held and Used [Table] Impaired Long-Lived Asset, Held and Used [Table] 2028 Finance Lease, Liability, to be Paid, Year Three Benefit plan accruals Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Accounts and notes receivable, percent outstanding less than 60 days (as a percent) Accounts And Notes Receivable, Percent Outstanding Less Than 60 Days Accounts and Notes Receivable, Percent Outstanding less than 60 days Goodwill [Line Items] Indefinite-lived Intangible Assets [Line Items] Indefinite-Lived Intangible Assets [Line Items] Estimated percentage of derivative contract volume expiring within twelve months (as a percent) Estimated Percentage Of Derivative Contract Volume Expiring Within Twelve Months Estimated percentage of derivative contract volume expiring within twelve months Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Divestiture Accumulated Defined Benefit Plans Adjustment, Gain (Loss) On Divestiture to Parent [Member] Accumulated Defined Benefit Plans Adjustment, Gain (Loss) On Divestiture to Parent Transfer in Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan Proceeds from asset dispositions Proceeds from Sale of Productive Assets 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 Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Total share-based compensation expense Share-Based Payment Arrangement, Expense Finance Lease, Liability, Current, Statement of Financial Position Flag Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Hedging Designation [Domain] Hedging Designation [Domain] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Gray Oak Holdings LLC Gray Oak Holdings LLC [Member] Gray Oak Holdings LLC [Member] Total Liabilities and Equity Liabilities and Equity Foreign Currency Foreign Currency Transactions and Translations Policy [Policy Text Block] Defined Benefit Plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Investment in joint ventures Deferred Tax Liabilities, Investment in Noncontrolled Affiliates Options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Asset Retirement Obligation and Accrual for Environmental Cost Disclosure [Abstract] Asset Retirement Obligation And Accrual For Environmental Cost Disclosure [Abstract] Asset Retirement Obligation And Accrual For Environmental Cost Disclosure Louisiana And Alabama Gathering And Processing Assets Louisiana And Alabama Gathering And Processing Assets [Member] Louisiana And Alabama Gathering And Processing Assets Cash and cash equivalents at beginning of year Cash and Cash Equivalents at End of Year 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. Other Deferred Tax Assets, Other Equity Method Investment [Table] Equity Method Investment [Table] Total finance lease cost Finance Lease, Cost Finance Lease, Cost Effect of Collateral Netting Effect of Collateral Netting Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Guarantees [Abstract] Guarantees [Abstract] Accounting Policies [Abstract] Accounting Policies [Abstract] Schedule of Operating Lease Liability Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Physical forward contracts Forward Contracts [Member] Gathering And Processing Assets Gathering And Processing Assets [Member] Gathering And Processing Assets Treasury Stock Treasury Stock, Common [Member] Shipping and Handling Costs Shipping And Handling Costs [Policy Text Block] Shipping And Handling Costs [Policy Text Block] Pay vs Performance Disclosure [Line Items] Government debt securities US Government Agencies Debt Securities [Member] Operating leases, Total lease liabilities Total lease liabilities Operating Lease, Liability Liabilities Liabilities [Abstract] DCP Midstream, LLC and DCP Midstream, LP Mergers Business Combinations Business Combination [Text Block] Scheduled interest payments annually Debt Instrument, Periodic Payment, Interest Amortization of right-of-use assets Finance Lease, Right-of-Use Asset, Amortization Auditor [Line Items] Auditor [Line Items] Dos Picos Dos Picos [Member] Dos Picos Site Contingency [Table] Site Contingency [Table] Excess (deficit) of Carrying Value over (under) Underlying Equity in Unconsolidated Affiliates Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Repurchase of noncontrolling interests Payments for Repurchase of Redeemable Noncontrolling Interest Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Company contributions Defined Benefit Plan, Plan Assets, Contributions by Employer 2028 Lessee, Operating Lease, Liability, to be Paid, Year Three Comprehensive Income Attributable to Phillips 66 Comprehensive Income (Loss), Net of Tax, Attributable to Parent Asset retirement obligations and accrued environmental costs Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Asset Retirement Obligations and Environmental Liabilities Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from asset retirement obligations and accrued environmental loss contingencies. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset and an accrued environmental loss contingency is an obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites. Disposal Group Name [Domain] Disposal Group Name [Domain] Name Measure Name Less: Goodwill allocated Disposal Group, Including Discontinued Operation, Goodwill Adjustment Disposal Group, Including Discontinued Operation, Goodwill Adjustment Secured Debt Secured Debt [Member] Refining and Processing Facilities Refining And Processing Facilities [Member] Refining And Processing Facilities [Member] Class of Stock [Line Items] Class of Stock [Line Items] 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 Expected return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets DCP Sand Hills and Southern Hills DCP Sand Hills and Southern Hills [Member] DCP Sand Hills and Southern Hills Deferred tax assets, tax credit carryforwards, foreign Deferred Tax Assets, Tax Credit Carryforwards, Foreign Income Tax Contingency [Table] Income Tax Contingency [Table] Long-term debt Long-Term Debt Legal Entity [Axis] Legal Entity [Axis] Total Assets Assets DAPL and ETCOP 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] Geographical [Domain] Geographical [Domain] Income Taxes Income Tax, Policy [Policy Text Block] 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. Discount on purchased credits Effective Income Tax Rate Reconciliation, Tax Exempt Income, Discount On Purchased Credits, Percent Effective Income Tax Rate Reconciliation, Tax Exempt Income, Discount On Purchased Credits, Percent Components of Deferred Tax Liabilities and Assets Components of Deferred Tax Assets and Liabilities [Abstract] Debt number of interest payment deferrals Debt Instrument, Number Of Interest Payment Deferrals Debt Instrument, Number Of Interest Payment Deferrals 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 Semi-annual discretionary company contribution target (as a percent) Defined Contribution Plan, Employer Discretionary Contribution, Target Percent Of Employees' Gross Pay Target percentage of employees' gross pay for which the employer may contribute a discretionary contribution to a defined contribution plan. Payment term (in days) Contract With Customer, Payment Term Contract With Customer, Payment Term Weighted average useful life of assumed intangible assets Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Schedule of Asset Retirement Obligations and Accrual for Environmental Costs Schedule of Asset Retirement Obligations and Accrual for Environmental Costs [Table Text Block] Tabular disclosure of asset retirement obligations and accrual for environmental costs Inventories Inventory Disclosure [Text Block] 4.680% Senior Notes due February 2045 4.680% Senior Notes due February 2045 [Member] 4.680% Senior Notes due February 2045 5.250% Senior Notes Due 2031 5.250% Senior Notes Due 2031 [Member] 5.250% Senior Notes Due 2031 2013 Omnibus Stock and Performance Incentive Plan of Phillips 66 2013 Omnibus Stock And Performance Incentive Plan Of Phillips 66 [Member] 2013 Omnibus Stock And Performance Incentive Plan Of Phillips 66 [Member] Other Interest and Debt Costs Incurred, Other Interest and debt expense on all other items not previously classified that was either capitalized or charged against earnings. 2026 Finance Lease, Liability, to be Paid, Year One Quarterly cash dividend declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Other investments Other Investments Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Right-of-use asset obtained in exchange for operating lease liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Level 2 Level 2 Fair Value, Inputs, Level 2 [Member] Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] State income tax, net of federal income tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Proceeds from accounts receivable securitization Proceeds from Accounts Receivable Securitization Expected future undiscounted payments, due in 2030 Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year Five 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] Gain on sale of Germany and Austria Marketing Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Related Party Related Party [Member] Change in Fair Value of Plan Assets Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Schedule of Components of Income Tax Expense (Benefits) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Damages awarded, jury verdict Loss Contingency, Damages Awarded, Jury Verdict, Value Loss Contingency, Damages Awarded, Jury Verdict, Value Plan Name [Axis] Plan Name [Axis] Property Dispositions Property, Plant and Equipment, Policy [Policy Text Block] PEO PEO [Member] Line of credit facility, maximum month-end outstanding amount Line of Credit Facility, Maximum Month-end Outstanding Amount Employee Severance Employee Severance [Member] Junior Subordinated Debt Junior Subordinated Debt [Member] United States UNITED STATES Working capital adjustments Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Changes in valuation allowances Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Volatility factor Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Retained Earnings Retained Earnings [Member] Phillips 66 Company Phillips 66 Company [Member] Phillips 66 Company [Member] Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Income Statement [Abstract] Income Statement [Abstract] Junior Subordinated Notes Junior Subordinated Notes [Member] Junior Subordinated Notes 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) Product and Service [Domain] Product and Service [Domain] Weighted-average exercise price, exercisable at ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price 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] New obligations New obligations Asset Retirement Obligation, Liabilities Incurred Total Derivative, Fair Value, Amount Offset Against Collateral, Net [Abstract] Non-taxable gain on disposition Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount Preferred units, liquidation preference Preferred Units, Liquidation Preference, Value Preferred Units, Liquidation Preference, Value City Area Code City Area Code 8.125% Senior Notes due August 2030 8.125% Senior Notes due August 2030 [Member] 8.125% Senior Notes due August 2030 Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Investments, Loans and Long-Term Receivables Investment [Text Block] Capitalized Interest Costs Capitalized Damages awarded, pre-judgment interest, percentage Loss Contingency, Damages Awarded, Pre-Judgment Interest, Percentage Loss Contingency, Damages Awarded, Pre-Judgment Interest, Percentage 0.900% Senior Notes due February 2024 0.900% Senior Notes Due February 2024 [Member] 0.900% Senior Notes Due February 2024 Member Net deferred tax liabilities Deferred Tax Liabilities, Net Cash Flows From Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Worldwide consolidated Long-Lived Assets Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Expected future undiscounted payments, due in 2029 Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year Four Company match of participant's contributions of eligible pay (as a percent) Defined Contribution Plan, Employer Matching Contribution, Percent of Match Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Federal Federal Income Tax Expense (Benefit), Continuing Operations [Abstract] Amortization of net actuarial loss (gain) Defined Benefit Plan, Amortization of Gain (Loss) Effective Income Tax Rate Reconciliation [Line Items] Effective Income Tax Rate Reconciliation [Line Items] Total net lease cost Lease, Cost Natural gas (billions of cubic feet) Natural Gas [Member] Goodwill Goodwill Beginning balance Ending balance Goodwill Senior Notes Due December 2031, 2035 And 2055 Senior Notes Due December 2031, 2035 And 2055 [Member] Senior Notes Due December 2031, 2035 And 2055 Schedule of Lease Cost, Cash Paid for Leases and Lease Term and Discount Rates Lease, Cost [Table Text Block] Purchases Purchases [Member] Purchases Prepaid expenses and other current assets Prepaid Expenses and Other Current Assets [Member] Fair value of plan assets Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets Deferred Deferred Federal Income Tax Expense (Benefit) Reconciliation of Unrecognized Tax Benefits [Roll Forward] Unrecognized Tax Benefits [Roll Forward] Auditor Name Auditor Name Accounts Receivable Factoring Transfers and Servicing of Financial Assets [Text Block] Inventory Business combination, recognized asset acquired, inventory, current Business Combination, Recognized Asset Acquired, Inventory, Current 4.650% Senior Notes due November 2034 4.650% Senior Notes due November 2034 [Member] 4.650% Senior Notes due November 2034 Supplemental Cash Flow Information [Abstract] Supplemental Cash Flow Information [Abstract] Revenue from External Customer [Line Items] Revenue from External Customer [Line Items] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] 3.550% Senior Notes due October 2026 3.550% Senior Notes due October 2026 [Member] 3.550% Senior Notes due October 2026 Other Performance Measure, Amount Other Performance Measure, Amount Weighted-Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Short-term debt Short-term debt Debt, Current M&S Marketing & Speciality Segment [Member] Marketing & Speciality Segment Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Payment term of receivables (in days) Payment Term Of Receivables Payment term of receivables. Related Party [Domain] Related and Nonrelated Parties [Domain] Amount Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Series A & Series B Junior Subordinated Notes due 2056 Series A & Series B Junior Subordinated Notes due 2056 [Member] Series A & Series B Junior Subordinated Notes due 2056 Total acquisition consideration Business Combination, Consideration Transferred and Preacquisition Equity Interest in Acquiree Derivative Instrument Risk [Axis] Derivative Instrument [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 Vesting [Axis] Vesting [Axis] Benefits paid Defined Benefit Plan, Plan Assets, Benefits Paid Leases Lessee, Finance Leases [Text Block] 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 Used in Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Weighted average remaining life (in years) 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] Interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Real Estate Investment Real Estate Investment [Member] Operating leases, Total right-of-use assets Operating Lease, Right-of-Use Asset Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Cliff Vesting Cliff Vesting [Member] Cliff Vesting [Member] Reductions for tax positions of prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Operating lease cost Operating Lease, Cost Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Divestiture Other Comprehensive Income (Loss), Defined Benefit Plan, Divestiture, Before Tax Other Comprehensive Income (Loss), Defined Benefit Plan, Divestiture, Before Tax Net Carrying Value Presented on the Balance Sheet Reported Value Measurement [Member] Plan Name [Domain] Plan Name [Domain] Weighted-average period for recognition of unrecognized compensation expense from unvested awards (in months) Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Taxes other than income taxes Taxes, Miscellaneous Decrease of treasury stock Acquisition Of Noncontrolling Interests Held By Public, Increase (Decrease) To Treasury Stock Acquisition Of Noncontrolling Interests Held By Public, Increase (Decrease) To Treasury Stock Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Less: valuation allowance Deferred Tax Assets, Valuation Allowance Equity [Abstract] Equity [Abstract] Sale of accounts receivable Consideration Received for Beneficial Interest Obtained for Transferring Financial Asset Derivative Instruments Derivatives, Policy [Policy Text Block] Segment Disclosures and Related Information Segment Reporting Disclosure [Text Block] Goodwill [Table] Goodwill [Table] Aggregate amounts of estimated payments under long-term throughput and take-or-pay agreements - 2027 Unrecorded Unconditional Purchase Obligation, to be Paid, Year Three 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] Schedule of Amounts Recognized in the Consolidated Balance Sheet Schedule of Amounts Recognized in Balance Sheet [Table Text Block] Fair value of plan assets at January 1 Fair value of plan assets at December 31 Fair value of plan assets Defined Benefit Plan, Plan Assets, Amount Current Current Federal Tax Expense (Benefit) 4.950% Senior Notes Due 2035 4.950% Senior Notes Due 2035 [Member] 4.950% Senior Notes Due 2035 Total debt Debt and Lease Obligation Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] 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 liability, noncurrent 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] Amortization of intangible assets Amortization of Intangible Assets Selling, general and administrative expenses Selling, General and Administrative Expense Audit Information [Abstract] Audit Information 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 Direct and indirect economic interest Direct Ownership Interest, Percent Direct Ownership Interest, Percent Settlement losses Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Revolving Credit Facility Revolving Credit Facility [Member] Statutory tax rate difference between United Kingdom and United States Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Finance leases Finance leases, Total lease liabilities Total lease liabilities Finance Lease, Liability Arrangement Duration Trading Arrangement Duration Dividends, Common Stock Dividends, Common Stock [Abstract] Other Share-Based Payment Arrangement, Other [Member] Share-Based Payment Arrangement, Other Fair value of cash settled units Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Cash Settlement, Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Cash Settlement, Fair Value Expected future undiscounted payments, due in 2028 Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year Three Segments [Axis] Segments [Axis] Materials and supplies Other Inventory, Net of Reserves Local Phone Number Local Phone Number Expected future undiscounted payments related to the portion of the accrued environmental costs that have been discounted Accrual for Environmental Loss Contingencies, Gross, Fiscal Year Maturity [Abstract] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Other Payment for (Proceeds from) Other Investing Activity Share-Based Compensation Plans Share-Based Payment Arrangement [Text Block] Non-taxable gain on disposition Effective Income Tax Rate Reconciliation, Disposition of Business, Percent DCP Sand Hills And DCP Southern Hills DCP Sand Hills And DCP Southern Hills [Member] DCP Sand Hills And DCP Southern Hills Intangible asset 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] Years of service (in years) Eligible Retirement Age, Years Of Service Requirement Eligible Retirement Age, Years Of Service Requirement Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debt Instrument [Axis] Debt Instrument [Axis] Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value 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 percentage (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Repurchase of common stock Cost of shares repurchased Treasury Stock, Value, Acquired, Cost Method Debt interest rate (as a percent) Debt Instrument, Interest Rate, Stated Percentage Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Axis] Other liabilities and deferred credits Operating Lease, Liability, Noncurrent Entity Voluntary Filers Entity Voluntary Filers Rabbi trust assets Rabbi Trust Assets [Member] Rabbi Trust Assets [Member] Assets Total Fair Value of Gross Assets & Liabilities Derivative Asset, Subject to Master Netting Arrangement, before Offset Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Entity Registrant Name Entity Registrant Name Income tax (benefit) expense reflected in the capital in excess of par column of the consolidated statement of equity Income Tax Effects Allocated Directly to Equity Disposal group, not discontinued operation, gain (loss) on disposal, statement of income or comprehensive income flag Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] 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) Foreign currency exchange rate change Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) Option, exercisable at ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Other State and Local Tax Jurisdiction, Other [Member] Total fair value of gross assets Assets, Fair Value Disclosure Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted Marketing and Specialties Acquisition Marketing and Specialties Acquisition [Member] Marketing and Specialties Acquisition Energy [Axis] Energy [Axis] Senior Notes Due 2027 And 2033 Senior Notes Due 2027 And 2033 [Member] Senior Notes Due 2027 And 2033 Effect of cross-border tax laws Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Amount [Abstract] Railcar and Airplane Railcar and Airplane [Member] Railcar and Airplane [Member] Schedule of Long Term Debt Schedule of Debt [Table Text Block] Consolidating Adjustments excluding Corporate Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Interest cost Defined Benefit Plan, Interest Cost Related Party [Axis] Related and Nonrelated Parties [Axis] Merger With DCP LP Merger With DCP LP [Member] Merger With DCP LP Repayments of long-term lines of credit Repayments of Long-Term Lines of Credit Expected future undiscounted payments, due in 2027 Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year Two Expected future undiscounted payments, due in 2026 Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year One Restatement Determination Date: Restatement Determination Date [Axis] 3.250% Senior Notes due February 2032 3.250% Senior Notes due February 2032 [Member] 3.250% Senior Notes due February 2032 Deferred Deferred Foreign Income Tax Expense (Benefit) Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Number of reporting units for purposes of testing goodwill for impairment Number of Reporting Units Contributions from noncontrolling interests Noncontrolling Interest, Increase from Subsidiary Equity Issuance Front Range Pipeline LLC Front Range Pipeline LLC Front Range Pipeline LLC [Member] Front Range Pipeline LLC Income Tax Expense (Benefit) Income Tax Expense (Benefit), Continuing Operations [Abstract] Other Proceeds from (Payment for) Other Financing Activity Debt Interest Expense, Debt Amounts reclassified from accumulated other comprehensive loss Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Tax law and rate changes Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Debt interest payment deferral, consecutive years per deferral period Debt Instrument, Interest Payment Deferral, Consecutive Years Per Deferral Period Debt Instrument, Interest Payment Deferral, Consecutive Years Per Deferral Period Name Trading Arrangement, Individual Name Cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax 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. Acquisition of noncontrolling interest in DCP Midstream, LP Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Debt issued and guaranteed Debt Instrument, Face Amount 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] 5.875% Senior Notes due May 2042 5.875% Senior Notes due May 2042 [Member] 5.875% Senior Notes due May 2042 Operating revenues and other income Operating Revenue And Other Income [Member] Operating Revenue And Other Income Share Repurchase Program [Axis] Share Repurchase Program [Axis] Settlement of relationships with Phillips 66 and WRB Business Combination, Consideration Transferred, Equity Interest Assumptions Used to Determine Net Periodic Benefit Cost: Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Name Awards Close in Time to MNPI Disclosures, Individual Name Other countries Other foreign countries [Member] Other foreign countries [Member] Weighted-average grant date fair value, not vested, end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Energy [Domain] Energy [Domain] Restructuring Type [Axis] Restructuring Type [Axis] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Crude Oil Processing And Logistics Assets Crude Oil Processing And Logistics Assets [Member] Crude Oil Processing And Logistics Assets 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 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Equity Instruments Other than Options, Issued in Period, Weighted Average Grant Date Fair Value 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 Assets Commodity Derivative Assets Derivative Asset [Abstract] Divestiture Defined Benefit Plan, Benefit Obligation, Divestiture Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Accretion of discount Asset Retirement Obligation, Accretion Expense 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. 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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. Employees Eligible for Retirement Employees Eligible for Retirement [Member] Employees Eligible for Retirement [Member] Loans and long-term receivables Accounts and Financing Receivable, after Allowance for Credit Loss, Noncurrent Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets [Table Text Block] Common stock (2,500,000,000 shares authorized at $0.01 par value) Issued (2025—656,987,861 shares; 2024—654,842,101 shares) Par value Common Stock, Value, Issued Finance leases, Total right-of-use assets Finance Lease, Right-of-Use Asset, after Accumulated Amortization Undistributed equity earnings Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Extension term (in years) Line Of Credit Facility, Extension Term Line Of Credit Facility, Extension Term Amortization of assumed intangible assets Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived NAV Fair Value Measured at Net Asset Value Per Share [Member] Business Combination [Axis] Business Combination [Axis] Comprehensive Income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Loans Payable Loans Payable [Member] Exchange-cleared instruments Exchange Cleared [Member] Noncontrolling Interests Noncontrolling Interest [Member] Impairment of Investments in Unconsolidated Affiliates Equity Method Investments [Policy Text Block] Defined benefit plan, amortization percentage Defined Benefit Plan, Amortization Percentage Defined Benefit Plan, Amortization Percentage Ownership interest (as a percent) Equity investment (as a percent) Equity Method Investment, Ownership Percentage Changes in Accounting Principles New Accounting Standards Accounting Standards Update and Change in Accounting Principle [Text Block] Notes reduction Derecognition of Discharged Notes and Distribution of Advance Term Loan from WRB Notes Reduction Eligible tax credits purchased Tax Credits Purchased, Inflation Reduction Act Tax Credits Purchased, Inflation Reduction Act PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount 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 Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Income before income taxes Income before income taxes Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax Floating-rate debt and Fixed-rate debt, excluding finance leases and software obligations Debt Instrument, Fair Value Disclosure Deferred tax liabilities Business Combination, Recognized Liability Assumed, Deferred Tax Liability Schedule of Unrecognized Tax Benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] 6.200% Series B Junior Subordinated Notes due March 2056 6.200% Series B Junior Subordinated Notes Due March 2056 [Member] 6.200% Series B Junior Subordinated Notes Due March 2056 Number Of Petroleum Refineries Number Of Petroleum Refineries Number Of Petroleum Refineries 4.900% Senior Notes due October 2046 4.900% Senior Notes due October 2046 [Member] 4.900% Senior Notes due October 2046 Crude Gathering Assets Crude Gathering Assets [Member] Crude Gathering Assets Defined benefit plans, net of income taxes Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Number of transactions Treasury Stock, Number Of Transactions Treasury Stock, Number Of Transactions 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 California CALIFORNIA Domestic Plan Domestic Plan [Member] Derivative Contract Type [Domain] Derivative Contract [Domain] Issuance of common stock Proceeds from Issuance of Common Stock 2030 Defined Benefit Plan, Expected Future Benefit Payment, Year Five Number of shares of common stock to be issued per stock unit (in shares) Number Of Shares Of Common Stock To Be Issued Per Stock Unit Number of shares of common stock to be issued per stock unit All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Noncash or Part Noncash Acquisitions [Line Items] Noncash or Part Noncash Acquisitions [Line Items] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Accounts and notes receivable Increase (Decrease) in Receivables Name Forgone Recovery, Individual Name Benefit plan activity and other 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. Aggregate amounts of estimated payments under long-term throughput and take-or-pay agreements - 2028 Unrecorded Unconditional Purchase Obligation, to be Paid, Year Four 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] Domestic Refineries and Underground Sites Domestic Refineries and Renewable Fuel Facilities and Underground Sites [Member] Domestic Refineries and Underground Sites [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Equity securities Defined Benefit Plan, Equity Securities [Member] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Geographical [Axis] Geographical [Axis] Performance measurement period (in years) Share-based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Performance Measurement Period Share-based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Performance Measurement Period Transaction Type [Axis] Transaction Type [Axis] Liabilities Commodity Derivative Liabilities Derivative Liability [Abstract] Customer-Related Intangible Assets Customer-Related Intangible Assets [Member] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Floating Rate Term Loan due June 2026 at 5.445% at year-end 2024 Floating Rate Term Loan due June 2026 [Member] Floating Rate Term Loan due June 2026 Foreign currency transaction (gains) losses Foreign Currency Transaction (Gains) Losses Gain (Loss), Foreign Currency Transaction, before Tax Investment in subsidiaries Deferred Tax Liabilities, Investment in Subsidiaries Deferred Tax Liabilities, Investment in Subsidiaries Income allocated to participating securities Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Title of 12(b) Security Title of 12(b) Security Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Incurred Interest And Debt Expense Incurred [Abstract] Interest And Debt Expense Incurred [Abstract] Coop Mineraloel AG Coop Mineraloel AG [Member] Coop Mineraloel AG Accounts Receivables Securitization Facility Accounts Receivables Securitization Facility [Member] Accounts Receivables Securitization Facility Net Income Attributable to Phillips 66 Per Share of Common Stock (dollars) Earnings Per Share [Abstract] Earnings Per Share [Abstract] 2030 Lessee, Operating Lease, Liability, to be Paid, Year Five Restructuring Plan [Axis] Restructuring Plan [Axis] Other income Other Income Nonoperating Income (Expense) Ownership percentage, divested Subsidiary, Ownership Percentage, Parent Return of investments in equity affiliates Proceeds from Equity Method Investment, Distribution, Return of Capital Goodwill assigned to divestiture Goodwill assigned to divestiture Goodwill, Written off Related to Sale of Business Unit Gathering Assets Gathering Assets [Member] Gathering Assets Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] 3.300% Senior Notes due March 2052 3.300% Senior Notes due March 2052 [Member] 3.300% Senior Notes due March 2052 Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Forfeitures Net actuarial gain (loss) arising during the period Net actuarial gain (loss) arising during the period Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax Repurchase of common stock (in shares) Treasury Stock, Shares, Acquired Remaining years Finance Lease, Liability, to be Paid, after Year Five Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price EnvironmentalRemediationExpenseStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag EnvironmentalRemediationExpenseStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag EnvironmentalRemediationExpenseStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag DCP Midstream Class B Segment DCP Midstream Class B Segment [Member] DCP Midstream Class B Segment Award Timing Disclosures [Line Items] Line of credit facility, borrowing maturity, period Line Of Credit Facility, Borrowing Maturity, Period Line Of Credit Facility, Borrowing Maturity, Period Schedule of Change in Asset Retirement Obligation Schedule of Change in Asset Retirement Obligation [Table Text Block] Schedule of Inventory Schedule of Inventory, Current [Table Text Block] Service cost Defined Benefit Plan, Service Cost Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Equity Equity [Text Block] Deferred Deferred State and Local Income Tax Expense (Benefit) Illinois ILLINOIS Net Income Attributable to Phillips 66 Net Income (Loss) Attributable to Parent Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Other Types of Investments Other Types of Investments [Member] Other Types of Investments [Member] Total distributions received from affiliates Proceeds From Equity Method Investment, Distribution And Return Of Capital Proceeds From Equity Method Investment, Distribution And Return Of Capital Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Preferred stock authorized, shares (in shares) Preferred Stock, Shares Authorized State and local State and Local Income Tax Expense (Benefit), Continuing Operations [Abstract] Repurchase of common stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Joint Venture Debt Obligation Guarantees Joint Venture Debt Obligation Guarantees [Member] Joint Venture Debt Obligation Guarantees Consolidating Adjustments Consolidation, Eliminations [Member] Line of Credit Line of Credit [Member] Schedule of Offsetting Liabilities Offsetting Liabilities [Table Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Schedule of Reconciliation of Projected Benefit Obligations and Plan Assets Schedule of Net Funded Status [Table Text Block] Merger of DCP Midstream, LLC and Gray Oak Holdings LLC Merger of DCP Midstream, LLC and Gray Oak Holdings LLC [Member] Merger of DCP Midstream, LLC and Gray Oak Holdings LLC Schedule of Share-Based Compensation Expense Tax Benefit Share-Based Payment Arrangement, Cost by Plan [Table Text Block] 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] Class of Stock [Axis] Class of Stock [Axis] Hedging Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Issued (in shares) Share-based Compensation Arrangement By Share-based Payment Award, Non-Option Equity Instruments, Issued Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Issued Maximum employee contribution of eligible pay (as a percent) Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Environmental Costs Environmental Costs, Policy [Policy Text Block] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Other Effective Income Tax Rate Reconciliation, Cross-Border, Other, Amount 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] Other Deferred Tax Liabilities, Other Retirement Plan Type [Axis] Retirement Plan Type [Axis] Other, net Other Nonoperating Income (Expense) CF United LLC CF United LLC [Member] CF United LLC [Member] Statement [Table] Statement [Table] Actual return on plan assets Actual increase in plan assets Actual return on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 5.300% Senior Notes due June 2033 5.300% Senior Notes Due June 2033 [Member] 5.300% Senior Notes Due June 2033 Schedule of Fair Value of Consideration Transferred and Amounts Included in Operations Business Combination [Table Text Block] Deferred income taxes Deferred Income Tax Expense (Benefit) Cash Flows From Financing Activities Cash Provided by 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Noncurrent Other Benefits Other Postretirement Benefits Plan [Member] Schedule of Fair Values of Pension Plan Assets Schedule of Allocation of Plan Assets [Table Text Block] Transfers and Servicing [Abstract] Treasury stock (at cost: 2025—258,252,603 shares; 2024—248,594,923 shares) Treasury Stock, Common, Value Termination Date Trading Arrangement Termination Date Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Exercise period three Share-Based Payment Arrangement, Tranche Three [Member] Weighted-average discount rate—operating leases Operating Lease, Weighted Average Discount Rate, Percent Total payments under long-term throughput and take-or-pay agreements Unrecorded Unconditional Purchase Obligation, Purchases Schedule of Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Accrued liabilities for interest and penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Reduction in the investment Reduction of WRB investment balance Transfer from Investments Coastal Bend Coastal Bend [Member] Coastal Bend Basic (in shares) Weighted-average commons shares outstanding - EPS (in shares) Weighted-average commons shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic New Jersey NEW JERSEY Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Inventory write-down Inventory Write-down Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Unrecognized tax benefits that if recognized would affect our effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Other liabilities and deferred credits Other Liabilities And Deferred Credits [Member] Other Liabilities And Deferred Credits [Member] Schedule of Long Term Investments and Receivables Schedule Of Long Term Investments And Receivables [Table Text Block] Tabular disclosure of long term investments and receivables. 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] Common/collective trusts measured at NAV Common Or Collective Trusts Equity Securities [Member] Common or collective trusts equity securities. 6.750% Senior Notes due September 2037 6.750% Senior Notes due September 2037 [Member] 6.750% Senior Notes due September 2037 Variable interest rate (as a percent) Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate Debt Disclosure [Abstract] Debt Disclosure [Abstract] Other Income Nonoperating Income (Expense) [Abstract] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] 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 Gains/(Losses) From Commodity Derivatives Schedule of Price Risk Derivatives [Table Text Block] 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. 5.500% Senior Notes Due 2055 5.500% Senior Notes Due 2055 [Member] 5.500% Senior Notes Due 2055 Restructuring and Related Activities [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Consolidated Entities [Axis] Consolidated Entities [Axis] 3.605% Senior Notes Due February 2025 3.605% Senior Notes Due February 2025 [Member] 3.605% Senior Notes Due February 2025 2031-2035 Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Use of Estimates Use of Estimates, Policy [Policy Text Block] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Current liabilities Liability, Defined Benefit Plan, Current Operating cash outflows—finance leases Finance Lease, Interest Payment on Liability Liabilities Effect of Counterparty Netting Derivative Asset, Subject to Master Netting Arrangement, Liability Offset 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] Forfeited (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Stock Units Performance Share Units Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Less: Liabilities incurred in conjunction with the sale Disposal Group Including Discontinued Operations, Liabilities Incurred, In Conjunction With Sale Disposal Group Including Discontinued Operations, Liabilities Incurred, In Conjunction With Sale Total Liabilities Liabilities Distributions to noncontrolling interests Payments of Ordinary Dividends, Noncontrolling Interest Outstanding, beginning of period (in dollars per share) Outstanding, end of period (in dollars per share) Share-based Compensation Arrangement By Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value 5.125% Senior Notes due May 2029 5.125% Senior Notes due May 2029 [Member] 5.125% Senior Notes due May 2029 Other accruals Other Accruals [Member] Other accruals member. Term Loan Agreement Term Loan Agreement [Member] Term Loan Agreement The Credit Agreement The Credit Agreement [Member] The Credit Agreement 2030 Finance Lease, Liability, to be Paid, Year Five Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Additions for tax positions of current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Debt instrument, repurchased face amount Debt Instrument, Repurchased Face Amount Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Trade names and trademarks Trademarks and Trade Names [Member] Dakota Senior Notes Dakota Senior Notes [Member] Dakota Senior Notes Expected future employer contributions next fiscal year Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Consolidation Items [Axis] Consolidation Items [Axis] Accrued environmental costs, discount rate, percent Accrual for Environmental Loss Contingencies, Discount Rate Insurance contracts Insurance Contracts [Member] Insurance Contracts [Member] Schedule of Stock Unit Activity Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Deferred Tax Liabilities Components of Deferred Tax Liabilities [Abstract] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Corporate debt securities Corporate Debt Securities [Member] Total recognized Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position Crude oil and products Energy Related Inventory, Crude Oil, Products and Merchandise