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  <xs:element id="psx_EmployeeBenefitObligationsCurrent" abstract="false" name="EmployeeBenefitObligationsCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="psx_AssetRetirementObligationsAndAccruedEnvironmentalCost" abstract="false" name="AssetRetirementObligationsAndAccruedEnvironmentalCost" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="psx_IncreaseDecreaseInTaxesAndOtherAccruals" abstract="false" name="IncreaseDecreaseInTaxesAndOtherAccruals" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="psx_CapitalExpendituresAndInvestments" abstract="false" name="CapitalExpendituresAndInvestments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="psx_TotalAdjustmentsToEquityFromShareBasedCompensation" abstract="false" name="TotalAdjustmentsToEquityFromShareBasedCompensation" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="psx_StockholdersEquitySharesRollForward" abstract="true" name="StockholdersEquitySharesRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="psx_AssetRetirementObligationAndAccrualForEnvironmentalCostDisclosureAbstract" abstract="true" name="AssetRetirementObligationAndAccrualForEnvironmentalCostDisclosureAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="psx_AssetRetirementObligationsAndEnvironmentalCostTextBlock" abstract="false" name="AssetRetirementObligationsAndEnvironmentalCostTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="psx_FinancialInstrumentsAndDerivativeContractsTextBlock" abstract="false" name="FinancialInstrumentsAndDerivativeContractsTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="psx_TaxesCollectedFromCustomersAndRemittedToGovernmentAuthoritiesPolicyPolicyTextBlock" abstract="false" name="TaxesCollectedFromCustomersAndRemittedToGovernmentAuthoritiesPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="psx_ShippingAndHandlingCostsPolicyTextBlock" abstract="false" name="ShippingAndHandlingCostsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="psx_ScheduleOfLongTermInvestmentsAndReceivablesTableTextBlock" abstract="false" name="ScheduleOfLongTermInvestmentsAndReceivablesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="psx_ScheduleOfAssetRetirementObligationsAndAccrualForEnvironmentalCostsTableTextBlock" abstract="false" name="ScheduleOfAssetRetirementObligationsAndAccrualForEnvironmentalCostsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="psx_ScheduleOfFairValueAssetsAndLiabilitiesAndOffsettingAssetsAndLiabilitiesTableTextBlock" abstract="false" name="ScheduleOfFairValueAssetsAndLiabilitiesAndOffsettingAssetsAndLiabilitiesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="psx_AssetsAndLiabilitiesLesseeTableTextBlock" abstract="false" name="AssetsAndLiabilitiesLesseeTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="psx_A2013OmnibusStockAndPerformanceIncentivePlanOfPhillips66Member" abstract="true" name="A2013OmnibusStockAndPerformanceIncentivePlanOfPhillips66Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_ConstructionPeriodForInterestCapitalizationTreatment" abstract="false" name="ConstructionPeriodForInterestCapitalizationTreatment" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="psx_ContractWithCustomerPaymentTerm" abstract="false" name="ContractWithCustomerPaymentTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="psx_MinimumServicePeriodToAvoidAwardForfeiture" abstract="false" name="MinimumServicePeriodToAvoidAwardForfeiture" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="psx_EligibleRetirementAge" abstract="false" name="EligibleRetirementAge" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="psx_EligibleRetirementAgeYearsOfServiceRequirement" abstract="false" name="EligibleRetirementAgeYearsOfServiceRequirement" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="psx_DCPMidstreamLLCMember" abstract="true" name="DCPMidstreamLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_GrayOakHoldingsLLCMember" abstract="true" name="GrayOakHoldingsLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_GrayOakPipelineLLCMember" abstract="true" name="GrayOakPipelineLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_DCPSandHillsAndSouthernHillsMember" abstract="true" name="DCPSandHillsAndSouthernHillsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_EnbridgeIncMember" abstract="true" name="EnbridgeIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_DCPMidstreamClassASegmentMember" abstract="true" name="DCPMidstreamClassASegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_DCPMidstreamClassBSegmentMember" abstract="true" name="DCPMidstreamClassBSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_DCPSandHillsAndDCPSouthernHillsMember" abstract="true" name="DCPSandHillsAndDCPSouthernHillsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_MergerOfDCPMidstreamLLCAndGrayOakHoldingsLLCMember" abstract="true" name="MergerOfDCPMidstreamLLCAndGrayOakHoldingsLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_AcquisitionOfDCPLPCommonUnitsHeldByPublicMember" abstract="true" name="AcquisitionOfDCPLPCommonUnitsHeldByPublicMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="psx_ClassBMembershipMember" abstract="true" name="ClassBMembershipMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="psx_PercentageOfOwnership" abstract="false" name="PercentageOfOwnership" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="psx_NumberOfClassesOfMembershipCreated" abstract="false" name="NumberOfClassesOfMembershipCreated" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
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  <xs:element id="psx_DirectOwnershipInterestPercent" abstract="false" name="DirectOwnershipInterestPercent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="psx_EquityMethodInvestmentDirectAndIndirectOwnershipInterestsPercent" abstract="false" name="EquityMethodInvestmentDirectAndIndirectOwnershipInterestsPercent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="psx_PaymentToAcquireNoncontrollingInterestsHeldByPublic" abstract="false" name="PaymentToAcquireNoncontrollingInterestsHeldByPublic" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="psx_LosAngelesRefineryMember" abstract="true" name="LosAngelesRefineryMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_PropertiesPlantsAndEquipmentNetAndIntangibleAssetsNetSalvageValue" abstract="false" name="PropertiesPlantsAndEquipmentNetAndIntangibleAssetsNetSalvageValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="psx_RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag" abstract="false" name="RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="psx_EnvironmentalRemediationExpenseStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag" abstract="false" name="EnvironmentalRemediationExpenseStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
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  <xs:element id="psx_DosPicosMember" abstract="true" name="DosPicosMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_MarketingAndSpecialtiesAcquisitionMember" abstract="true" name="MarketingAndSpecialtiesAcquisitionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_BusinessCombinationRecognizedLiabilityAssumedShortTermDebt" abstract="false" name="BusinessCombinationRecognizedLiabilityAssumedShortTermDebt" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="psx_BusinessCombinationNetWorkingCapital" abstract="false" name="BusinessCombinationNetWorkingCapital" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="psx_BusinessCombinationRecognizedLiabilityAssetRetirementObligationsAndAccruedEnvironmentalCosts" abstract="false" name="BusinessCombinationRecognizedLiabilityAssetRetirementObligationsAndAccruedEnvironmentalCosts" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="psx_BusinessCombinationRecognizedLiabilitiesAssumedAssetRetirementObligations" abstract="false" name="BusinessCombinationRecognizedLiabilitiesAssumedAssetRetirementObligations" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="psx_RefinedPetroleumProductsAndRenewableFuelsMember" abstract="true" name="RefinedPetroleumProductsAndRenewableFuelsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_OtherProductLineMember" abstract="true" name="OtherProductLineMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_OtherGeographicalAreasMember" abstract="true" name="OtherGeographicalAreasMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_CustomerContractsTerm" abstract="false" name="CustomerContractsTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="psx_AccountsAndNotesReceivablePercentOutstandingLessThan60Days" abstract="false" name="AccountsAndNotesReceivablePercentOutstandingLessThan60Days" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="psx_ChevronPhillipsChemicalCompanyLLCMember" abstract="true" name="ChevronPhillipsChemicalCompanyLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_GulfCoastExpressPipelineLLCMember" abstract="true" name="GulfCoastExpressPipelineLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_DakotaAccessLLCMember" abstract="true" name="DakotaAccessLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_JETManagementHoldingMember" abstract="true" name="JETManagementHoldingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_FrontRangePipelineLLCMember" abstract="true" name="FrontRangePipelineLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_CFUnitedLLCMember" abstract="true" name="CFUnitedLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_OnCueHoldingsLLCMember" abstract="true" name="OnCueHoldingsLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_RetailMarketingBusinessMember" abstract="true" name="RetailMarketingBusinessMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_DakotaSeniorNotesMember" abstract="true" name="DakotaSeniorNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_Phillips66PartnersLPMember" abstract="true" name="Phillips66PartnersLPMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_DakotaAccessandETCOMember" abstract="true" name="DakotaAccessandETCOMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_NumberOfPipelines" abstract="false" name="NumberOfPipelines" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="psx_RepaymentsOfDebtContribution" abstract="false" name="RepaymentsOfDebtContribution" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="psx_RepaymentsOfDebtForgoneDistributions" abstract="false" name="RepaymentsOfDebtForgoneDistributions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="psx_MaximumExposureUndiscounted" abstract="false" name="MaximumExposureUndiscounted" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="psx_CoopMineraloelAGMember" abstract="true" name="CoopMineraloelAGMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_NorthDakotaPipelineAndTerminalAssetsMember" abstract="true" name="NorthDakotaPipelineAndTerminalAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_LouisianaAndAlabamaGatheringAndProcessingAssetsMember" abstract="true" name="LouisianaAndAlabamaGatheringAndProcessingAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_RockiesExpressPipelineLLCMember" abstract="true" name="RockiesExpressPipelineLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_ProceedsFromSaleOfEquityMethodInvestmentAndAnnualDividends" abstract="false" name="ProceedsFromSaleOfEquityMethodInvestmentAndAnnualDividends" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="psx_DisposalGroupIncludingDiscontinuedOperationsReclassificationFromAccumulatedOtherComprehensiveIncome" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationsReclassificationFromAccumulatedOtherComprehensiveIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="psx_DisposalGroupIncludingDiscontinuedOperationsCarryingValueOfAssetsNetOfLiabilitiesSold" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationsCarryingValueOfAssetsNetOfLiabilitiesSold" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="psx_DisposalGroupIncludingDiscontinuedOperationGoodwillAdjustment" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationGoodwillAdjustment" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="psx_DisposalGroupIncludingDiscontinuedOperationsGainLossOnForeignCurrencyForwardContracts" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationsGainLossOnForeignCurrencyForwardContracts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="psx_DisposalGroupIncludingDiscontinuedOperationsLiabilitiesIncurredInConjunctionWithSale" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationsLiabilitiesIncurredInConjunctionWithSale" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="psx_ProceedsFromEquityMethodInvestmentDistributionAndReturnOfCapital" abstract="false" name="ProceedsFromEquityMethodInvestmentDistributionAndReturnOfCapital" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="psx_GatheringAssetsMember" abstract="true" name="GatheringAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_MidstreamSegmentMember" abstract="true" name="MidstreamSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_ChemicalsSegmentMember" abstract="true" name="ChemicalsSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_RefiningSegmentMember" abstract="true" name="RefiningSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_MarketingAndSpecialtiesSegmentMember" abstract="true" name="MarketingAndSpecialtiesSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_RenewableFuelsMember" abstract="true" name="RenewableFuelsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_FiniteLivedIntangibleAssetsEstimatedFutureAmortizationExpense" abstract="false" name="FiniteLivedIntangibleAssetsEstimatedFutureAmortizationExpense" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="psx_RefineryAirAndOperatingPermitsMember" abstract="true" name="RefineryAirAndOperatingPermitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_MarketingAndSpecialtiesMember" abstract="true" name="MarketingAndSpecialtiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="psx_GatheringAndProcessingAssetsMember" abstract="true" name="GatheringAndProcessingAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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</xs:schema>
