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| <xs:element id="hwm_RaytheonTechnologiesCorporationMember" abstract="true" name="RaytheonTechnologiesCorporationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_EngineProductsSegmentMember" abstract="true" name="EngineProductsSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_RestructuringReservePeriodExpenses" abstract="false" name="RestructuringReservePeriodExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_ExtinguishmentOfDebtEarlyTerminationPremium" abstract="false" name="ExtinguishmentOfDebtEarlyTerminationPremium" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_FivePointNineFivePercentNotesDueTwoThousandThirtySevenMember" abstract="true" name="FivePointNineFivePercentNotesDueTwoThousandThirtySevenMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_CertainCustomersMember" abstract="true" name="CertainCustomersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="hwm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceShareAdjustment" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceShareAdjustment" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/> |
| <xs:element id="hwm_AerospaceCommercialMember" abstract="true" name="AerospaceCommercialMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_JPYTermLoanAgreementDue2026Member" abstract="true" name="JPYTermLoanAgreementDue2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="hwm_NumberOfCleanupLocations" abstract="false" name="NumberOfCleanupLocations" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/> |
| <xs:element id="hwm_ForeignTaxCreditCarryoverMember" abstract="true" name="ForeignTaxCreditCarryoverMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="hwm_PatentLicenseAgreementMember" abstract="true" name="PatentLicenseAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_DeferredTaxLiabilitiesDepreciation" abstract="false" name="DeferredTaxLiabilitiesDepreciation" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_ReceivablesPurchaseAgreementMember" abstract="true" name="ReceivablesPurchaseAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_DeferredTaxLiabilityInterest" abstract="false" name="DeferredTaxLiabilityInterest" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_PercentageOfTemporaryTaxDifferencesThatReverseWithinCarryforwardPeriod" abstract="false" name="PercentageOfTemporaryTaxDifferencesThatReverseWithinCarryforwardPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/> |
| <xs:element id="hwm_DeferredTaxLiabilitiesTaxCreditCarryforwards" abstract="false" name="DeferredTaxLiabilitiesTaxCreditCarryforwards" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_AssetsAndLiabilitiesLesseeTableTextBlock" abstract="false" name="AssetsAndLiabilitiesLesseeTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/> |
| <xs:element id="hwm_PayablesExcludedFromPensionPlanAssets" abstract="false" name="PayablesExcludedFromPensionPlanAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_NetOtherPostRetirementBenefitsMember" abstract="true" name="NetOtherPostRetirementBenefitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_IncreaseDecreaseInSharebasedCompensation" abstract="false" name="IncreaseDecreaseInSharebasedCompensation" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_RecurringCostsOfManagingHazardousSubstancesAndEnvironmentalProgramsMember" abstract="true" name="RecurringCostsOfManagingHazardousSubstancesAndEnvironmentalProgramsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_DebtInstrumentCovenantComplianceRatioOfConsolidatedNetDebtToConsolidatedEBITDA" abstract="false" name="DebtInstrumentCovenantComplianceRatioOfConsolidatedNetDebtToConsolidatedEBITDA" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/> |
| <xs:element id="hwm_DeferredTaxLiabilitiesGross" abstract="false" name="DeferredTaxLiabilitiesGross" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_ScheduleOfAssetsBySegmentTable" abstract="true" name="ScheduleOfAssetsBySegmentTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/> |
| <xs:element id="hwm_A2021RestructuringProgramsMember" abstract="true" name="A2021RestructuringProgramsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_ExpiresWithinTenYearsMember" abstract="true" name="ExpiresWithinTenYearsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_EngineeredStructuresMember" abstract="true" name="EngineeredStructuresMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_DefinedBenefitPlanPlanAssetsAmountExcludingCertainNetReceivables" abstract="false" name="DefinedBenefitPlanPlanAssetsAmountExcludingCertainNetReceivables" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_LineOfCreditFacilityMaximumAdditionalBorrowingCapacity" abstract="false" name="LineOfCreditFacilityMaximumAdditionalBorrowingCapacity" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_AmountCommittedUnderOutstandingSuretyBonds" abstract="false" name="AmountCommittedUnderOutstandingSuretyBonds" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsConverted" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsConverted" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/> |
| <xs:element id="hwm_ExpiresWithinElevenToTwentyYearsMember" abstract="true" name="ExpiresWithinElevenToTwentyYearsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_DebtInstrumentRedemptionPriceAmountRedeemedWithCashOnHand" abstract="false" name="DebtInstrumentRedemptionPriceAmountRedeemedWithCashOnHand" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_DefinedBenefitPensionPlansNetPeriodicBenefitCost" abstract="false" name="DefinedBenefitPensionPlansNetPeriodicBenefitCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_OtherDebtMember" abstract="true" name="OtherDebtMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="hwm_ReceivablesExcludedFromPensionPlanAssets" abstract="false" name="ReceivablesExcludedFromPensionPlanAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_FivePointEightSevenPercentNotesDueTwoThousandTwentyTwoMember" abstract="true" name="FivePointEightSevenPercentNotesDueTwoThousandTwentyTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_SummaryOfSignificantAccountingPoliciesTable" abstract="true" name="SummaryOfSignificantAccountingPoliciesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/> |
| <xs:element id="hwm_AccountsReceivableSaleAmountOutstanding" abstract="false" name="AccountsReceivableSaleAmountOutstanding" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_AerospaceDefenseMember" abstract="true" name="AerospaceDefenseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalConvertedValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalConvertedValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_UnitedStatesAndCanadaMember" abstract="true" name="UnitedStatesAndCanadaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="hwm_ScheduleOfSegmentReportingInformationToConsolidateNetIncomeLossAttributableToParentTableTextBlock" abstract="false" name="ScheduleOfSegmentReportingInformationToConsolidateNetIncomeLossAttributableToParentTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/> |
| <xs:element id="hwm_EngineProductsAndFasteningSystemsMember" abstract="true" name="EngineProductsAndFasteningSystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="hwm_PercentageOfEffectOfUnrecognizedTaxBenefitIfRecorded" abstract="false" name="PercentageOfEffectOfUnrecognizedTaxBenefitIfRecorded" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/> |
| <xs:element id="hwm_CorporateCenterMember" abstract="true" name="CorporateCenterMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_OtherLongTermDebtIncludingUnamortizedDebtDiscountsAndIssuanceCosts" abstract="false" name="OtherLongTermDebtIncludingUnamortizedDebtDiscountsAndIssuanceCosts" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsPerformanceSharesAdjustment" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsPerformanceSharesAdjustment" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/> |
| <xs:element id="hwm_DeferredTaxLiabilitiesLossProvisions" abstract="false" name="DeferredTaxLiabilitiesLossProvisions" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_RestructuringAndOtherChargesMember" abstract="true" name="RestructuringAndOtherChargesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_ReconciliationOfChangesInValuationAllowanceRollForward" abstract="true" name="ReconciliationOfChangesInValuationAllowanceRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/> |
| <xs:element id="hwm_TaxYears2010Through2012Member" abstract="true" name="TaxYears2010Through2012Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="hwm_ThreePointZeroPercentNotesDueTwoThousandTwentyNineMember" abstract="true" name="ThreePointZeroPercentNotesDueTwoThousandTwentyNineMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_OtherDeferredTaxAssetsMember" abstract="true" name="OtherDeferredTaxAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_FourPointSevenFivePercentIowaFinanceAuthorityLoanDueTwoThousandFortyTwoMember" abstract="true" name="FourPointSevenFivePercentIowaFinanceAuthorityLoanDueTwoThousandFortyTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_LossContingencyNumberOfEntities" abstract="false" name="LossContingencyNumberOfEntities" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/> |
| <xs:element id="hwm_DeferredTaxAssetsDepreciation" abstract="false" name="DeferredTaxAssetsDepreciation" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_OtherGeographicalRegionsMember" abstract="true" name="OtherGeographicalRegionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageGrantDateFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageGrantDateFairValue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/> |
| <xs:element id="hwm_ChangeInValuationAllowanceRelatedToDeferredStateIncomeTaxes" abstract="false" name="ChangeInValuationAllowanceRelatedToDeferredStateIncomeTaxes" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_LitigationSettlementNumberOfInstallmentPayments" abstract="false" name="LitigationSettlementNumberOfInstallmentPayments" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/> |
| <xs:element id="hwm_ReversalOfPriorPeriodProgramsMember" abstract="true" name="ReversalOfPriorPeriodProgramsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_SupplierFinanceProgramAgreementTerminationNoticePeriod" abstract="false" name="SupplierFinanceProgramAgreementTerminationNoticePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/> |
| <xs:element id="hwm_ShareBasedCompensationArrangementByShareBasedPaymentAwardsEquityInstrumentsOtherThanOptionsPerformanceShareAdjustment" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardsEquityInstrumentsOtherThanOptionsPerformanceShareAdjustment" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/> |
| <xs:element id="hwm_GainLossOnDivestituresOfAssetsAndBusinessIncludedInRestructuringCharges" abstract="false" name="GainLossOnDivestituresOfAssetsAndBusinessIncludedInRestructuringCharges" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_SmallManufacturingFacilityInFranceMember" abstract="true" name="SmallManufacturingFacilityInFranceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostInterestCostDiscountRate" abstract="false" name="DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostInterestCostDiscountRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/> |
| <xs:element id="hwm_AccountsReceivableFromSecuritizationFaceAmountAfterProvisionToIncreaseLimit" abstract="false" name="AccountsReceivableFromSecuritizationFaceAmountAfterProvisionToIncreaseLimit" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_LossContingencyNumberOfInterestRateSwapTransactions" abstract="false" name="LossContingencyNumberOfInterestRateSwapTransactions" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/> |
| <xs:element id="hwm_IntermediateAndLongDurationGovernmentCreditMember" abstract="true" name="IntermediateAndLongDurationGovernmentCreditMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsConvertedOrTransferredInPeriodWeightedAverageExercisePrice" abstract="false" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsConvertedOrTransferredInPeriodWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/> |
| <xs:element id="hwm_ArconicCorporationEnvironmentalObligationsMember" abstract="true" name="ArconicCorporationEnvironmentalObligationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_FixedIncomeOtherMember" abstract="true" name="FixedIncomeOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_OtherComprehensiveIncomeDefinedBenefitPlanNetAmountRecognizedBeforeTaxEffect" abstract="false" name="OtherComprehensiveIncomeDefinedBenefitPlanNetAmountRecognizedBeforeTaxEffect" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostCashBalancePlanInterestCreditingRate" abstract="false" name="DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostCashBalancePlanInterestCreditingRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/> |
| <xs:element id="hwm_SummaryOfSignificantAccountingPoliciesLineItems" abstract="true" name="SummaryOfSignificantAccountingPoliciesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/> |
| <xs:element id="hwm_InterestIncomeFromIncomeTaxes" abstract="false" name="InterestIncomeFromIncomeTaxes" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_USDTermLoanMember" abstract="true" name="USDTermLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="hwm_EngineProductsMember" abstract="true" name="EngineProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_ScheduleOfAssetsBySegmentLineItems" abstract="true" name="ScheduleOfAssetsBySegmentLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/> |
| <xs:element id="hwm_DebtInstrumentRedemptionPriceAmountRedeemedWithLoanFacility" abstract="false" name="DebtInstrumentRedemptionPriceAmountRedeemedWithLoanFacility" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_PercentageOfDeferredTaxAssetExclusiveOfReversingTemporaryDifferences" abstract="false" name="PercentageOfDeferredTaxAssetExclusiveOfReversingTemporaryDifferences" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/> |
| <xs:element id="hwm_OtherInvestmentsOtherMember" abstract="true" name="OtherInvestmentsOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_PensionSettlementCostMember" abstract="true" name="PensionSettlementCostMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_EffectiveIncomeTaxRateReconciliationTaxCreditForeignDevelopmentIncentivesAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationTaxCreditForeignDevelopmentIncentivesAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_SecuredOvernightFinancingRateSOFRMember" abstract="true" name="SecuredOvernightFinancingRateSOFRMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="hwm_AuditInformationAbstract" abstract="true" name="AuditInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/> |
| <xs:element id="hwm_OtherExitCostsMember" abstract="true" name="OtherExitCostsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_AerospaceMember" abstract="true" name="AerospaceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_StructureSystemsMember" abstract="true" name="StructureSystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_AccountsReceivableFromSecuritizationAmountDrawn" abstract="false" name="AccountsReceivableFromSecuritizationAmountDrawn" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_OtherIntangibleAssetsTableTextBlock" abstract="false" name="OtherIntangibleAssetsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/> |
| <xs:element id="hwm_DeferredTaxLiabilitiesEmployeeBenefits" abstract="false" name="DeferredTaxLiabilitiesEmployeeBenefits" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_CommercialTransportationMember" abstract="true" name="CommercialTransportationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostServiceCostDiscountRate" abstract="false" name="DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostServiceCostDiscountRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/> |
| <xs:element id="hwm_PreferredStockNumberOfClasses" abstract="false" name="PreferredStockNumberOfClasses" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/> |
| <xs:element id="hwm_ScheduleOfFinancialReceivablesLineItems" abstract="true" name="ScheduleOfFinancialReceivablesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/> |
| <xs:element id="hwm_EffectiveIncomeTaxReconciliationUnitedStatesAndResidualTaxOnForeignEarningsPercent" abstract="false" name="EffectiveIncomeTaxReconciliationUnitedStatesAndResidualTaxOnForeignEarningsPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/> |
| <xs:element id="hwm_PropertiesPlantsAndEquipmentExcludingConstructionWorkInProgress" abstract="false" name="PropertiesPlantsAndEquipmentExcludingConstructionWorkInProgress" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="hwm_ScheduleOfProFormaRestructuringChargesByReportableSegmentBeforeIncomeTaxTableTextBlock" abstract="false" name="ScheduleOfProFormaRestructuringChargesByReportableSegmentBeforeIncomeTaxTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/> |
| <xs:element id="hwm_EquitiesEquitySecuritiesMember" abstract="true" name="EquitiesEquitySecuritiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_CorporateAircraftMember" abstract="true" name="CorporateAircraftMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_OtherComprehensiveIncomeLossBeforeReclassificationAbstract" abstract="true" name="OtherComprehensiveIncomeLossBeforeReclassificationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/> |
| <xs:element id="hwm_FivePointFourZeroPercentNotesDueTwoThousandTwentyOneMember" abstract="true" name="FivePointFourZeroPercentNotesDueTwoThousandTwentyOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_AlcoaCorporationWorkersCompensationClaimsMember" abstract="true" name="AlcoaCorporationWorkersCompensationClaimsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="hwm_ScheduleOfExpirationPeriodsOfDeferredTaxAssetsTableTextBlock" abstract="false" name="ScheduleOfExpirationPeriodsOfDeferredTaxAssetsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/> |
| </xs:schema> |