3.26.1 html 126 80 1 false 17 0 false 4 false false R1.htm 75000 - Document - Document and Entity Information Sheet http://www.phillips66.com/20251231/taxonomy/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 75010 - Statement - Statements of Net Assets Available for Benefits Sheet http://www.phillips66.com/20251231/taxonomy/role/StatementStatementsOfNetAssetsAvailableForBenefits Statements of Net Assets Available for Benefits Statements 2 false false R3.htm 75020 - Statement - Statement of Changes in Net Assets Available for Benefits Sheet http://www.phillips66.com/20251231/taxonomy/role/StatementStatementOfChangesInNetAssetsAvailableForBenefits Statement of Changes in Net Assets Available for Benefits Statements 3 false false R4.htm 75030 - Disclosure - Plan Description Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosurePlanDescription Plan Description Notes 4 false false R5.htm 75040 - Disclosure - Significant Accounting Policies Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosureSignificantAccountingPolicies Significant Accounting Policies Notes 5 false false R6.htm 75050 - Disclosure - Investments Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosureInvestments Investments Notes 6 false false R7.htm 75060 - Disclosure - Fair Value Measurements Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosureFairValueMeasurements Fair Value Measurements Notes 7 false false R8.htm 75070 - Disclosure - Investment Strategy Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosureInvestmentStrategy Investment Strategy Notes 8 false false R9.htm 75080 - Disclosure - Tax Status Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosureTaxStatus Tax Status Notes 9 false false R10.htm 75090 - Disclosure - Related-Party and Party-in-Interest Transactions Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosureRelatedpartyAndPartyininterestTransactions Related-Party and Party-in-Interest Transactions Notes 10 false false R11.htm 75100 - Disclosure - Plan Termination Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosurePlanTermination Plan Termination Notes 11 false false R12.htm 75110 - Disclosure - Reconciliation of Financial Statements to Form 5500 Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosureReconciliationOfFinancialStatementsToForm5500 Reconciliation of Financial Statements to Form 5500 Notes 12 false false R13.htm 75120 - Disclosure - Subsequent Event Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosureSubsequentEvent Subsequent Event Notes 13 false false R14.htm 75130 - Disclosure - Schedule of Assets Held at End of Year Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosureScheduleOfAssetsHeldAtEndOfYear Schedule of Assets Held at End of Year Notes 14 false false R15.htm 75140 - Disclosure - Significant Accounting Policies (Policies) Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosureSignificantAccountingPoliciesPolicies Significant Accounting Policies (Policies) Policies http://www.phillips66.com/20251231/taxonomy/role/DisclosureSignificantAccountingPolicies 15 false false R16.htm 75150 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosureFairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://www.phillips66.com/20251231/taxonomy/role/DisclosureFairValueMeasurements 16 false false R17.htm 75160 - Disclosure - Reconciliation of Financial Statements to Form 5500 (Tables) Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosureReconciliationOfFinancialStatementsToForm5500Tables Reconciliation of Financial Statements to Form 5500 (Tables) Tables http://www.phillips66.com/20251231/taxonomy/role/DisclosureReconciliationOfFinancialStatementsToForm5500 17 false false R18.htm 75170 - Disclosure - Schedule of Assets Held at End of Year (Tables) Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosureScheduleOfAssetsHeldAtEndOfYearTables Schedule of Assets Held at End of Year (Tables) Tables http://www.phillips66.com/20251231/taxonomy/role/DisclosureScheduleOfAssetsHeldAtEndOfYear 18 false false R19.htm 75180 - Disclosure - Plan Description - Additional Information (Details) Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosurePlanDescriptionAdditionalInformationDetails Plan Description - Additional Information (Details) Details 19 false false R20.htm 75190 - Disclosure - Fair Value Measurements - Schedule of Plan Investment Assets Fair Value (Details) Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosureFairValueMeasurementsScheduleOfPlanInvestmentAssetsFairValueDetails Fair Value Measurements - Schedule of Plan Investment Assets Fair Value (Details) Details 20 false false R21.htm 75200 - Disclosure - Investment Strategy - Additional Information (Details) Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosureInvestmentStrategyAdditionalInformationDetails Investment Strategy - Additional Information (Details) Details 21 false false R22.htm 75210 - Disclosure - Tax Status - Additional Information (Details) Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosureTaxStatusAdditionalInformationDetails Tax Status - Additional Information (Details) Details 22 false false R23.htm 75220 - Disclosure - Reconciliation of Financial Statements to Form 5500 - Schedule of Reconciliation of Net Assets Available for Benefits (Details) Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosureReconciliationOfFinancialStatementsToForm5500ScheduleOfReconciliationOfNetAssetsAvailableForBenefitsDetails Reconciliation of Financial Statements to Form 5500 - Schedule of Reconciliation of Net Assets Available for Benefits (Details) Details 23 false false R24.htm 75230 - Disclosure - Reconciliation of Financial Statements to Form 5500 - Schedule of Reconciliation of Net Increase (Details) Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosureReconciliationOfFinancialStatementsToForm5500ScheduleOfReconciliationOfNetIncreaseDetails Reconciliation of Financial Statements to Form 5500 - Schedule of Reconciliation of Net Increase (Details) Details 24 false false R25.htm 75240 - Disclosure - Subsequent Event - Additional Information (Details) Sheet http://www.phillips66.com/20251231/taxonomy/role/DisclosureSubsequentEventAdditionalInformationDetails Subsequent Event - Additional Information (Details) Details 25 false false R26.htm 75250 - Schedule - Schedule of Assets Held at End of Year (Details) Sheet http://www.phillips66.com/20251231/taxonomy/role/ScheduleScheduleOfAssetsHeldAtEndOfYearDetails Schedule of Assets Held at End of Year (Details) Details http://www.phillips66.com/20251231/taxonomy/role/DisclosureScheduleOfAssetsHeldAtEndOfYearTables 26 false false All Reports Book All Reports psx-20251231.htm psx-20251231.xsd http://fasb.org/us-gaap-ebp/2025 http://xbrl.sec.gov/dei/2025 false false