ARNC


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockSharesOutstanding
us-gaap:StatementEquityComponents

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization

us-gaap:ResearchAndDevelopmentExpense

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:OperatingIncomeLoss
us-gaap:ConsolidationItems

us-gaap:InterestExpense
us-gaap:ConsolidationItems

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

us-gaap:NonoperatingIncomeExpense
us-gaap:ConsolidationItems

us-gaap:IncomeTaxExpenseBenefit

us-gaap:ProfitLoss
us-gaap:StatementEquityComponents

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:Assets
us-gaap:ConsolidationItems
us-gaap:StatementBusinessSegments

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue
us-gaap:ConsolidationItems

us-gaap:AccountsReceivableNetCurrent

us-gaap:InventoryNet

us-gaap:InventoryLIFOReserve

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:ConsolidationItems, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:ConsolidationItems, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:StatementBusinessSegments
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:ConsolidationItems

us-gaap:Goodwill
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ReportingUnit
us-gaap:StatementBusinessSegments

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:ConsolidationItems
us-gaap:DeferredTaxAssetsLiabilitiesNet

us-gaap:OtherAssetsNoncurrent

us-gaap:LiabilitiesCurrent

us-gaap:LongTermDebtCurrent

us-gaap:AccountsPayableCurrent

us-gaap:TaxesPayableCurrent

us-gaap:OtherLiabilitiesCurrent

us-gaap:LongTermDebt
us-gaap:DebtInstrument

us-gaap:LongTermDebtNoncurrent
us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:MinorityInterest

us-gaap:StockholdersEquity

us-gaap:CommonStockValue

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss

us-gaap:ProfitLoss
us-gaap:StatementEquityComponents

us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInInventories

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:RepaymentsOfLongTermDebt

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:RepaymentsOfLongTermDebt
us-gaap:DebtInstrument
us-gaap:DebtInstrumentInterestRateStatedPercentage
us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:EffectiveIncomeTaxRateContinuingOperations
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet
us-gaap:ValuationAllowancesAndReservesType

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance
us-gaap:ValuationAllowancesAndReservesType

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

arnc:DeferredPriceCustomerReceivables
us-gaap:ReportingUnit, us-gaap:SubsequentEventType

arnc:DefinedBenefitPensionPlansNetPeriodicBenefitCost
us-gaap:Range
arnc:FundingOfCustomerReceivablesSold
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
arnc:GainLossOnDispositionOfAssetsNetOfTax

arnc:IncreaseDecreaseInSharebasedCompensation
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:StatementBusinessSegments
arnc:NumberOfEmployees
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:StatementBusinessSegments, us-gaap:SubsequentEventType

arnc:RestructuringAndOtherCharges

arnc:RestructuringAndOtherChargesAfterTax
us-gaap:RestructuringCostAndReserve

arnc:RestructuringReservePeriodExpenses
us-gaap:RestructuringCostAndReserve
us-gaap:ConsolidationItems
arnc:SegmentReportingInformationCorporateExpenses

arnc:SegmentReportingInformationDepreciationAndAmortizationExpense
us-gaap:StatementBusinessSegments

arnc:SegmentReportingInformationProfitsLosses
us-gaap:StatementBusinessSegments

arnc:SegmentReportingInformationRestructuringAndOtherCharges
us-gaap:StatementBusinessSegments

arnc:SeparationTransactionCostsBeforeTax

arnc:SeparationTransactionCostsNetOfTax
us-gaap:ConsolidatedEntities
arnc:WeightedAverageInterestRateOutstandingBorrowings

us-gaap:AccrualForEnvironmentalLossContingenciesPayments1

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities, us-gaap:SubsequentEventType

us-gaap:CommonStockDividendsPerShareCashPaid

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:DeferredIncomeTaxesAndTaxCredits
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost

us-gaap:DepreciationAndAmortization

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents
us-gaap:StatementClassOfStock
us-gaap:DividendsPreferredStockCash
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:GainLossOnDispositionOfAssets1
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:GainLossOnSaleOfBusiness
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:StatementBusinessSegments
us-gaap:Range, us-gaap:StatementScenario, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:StatementBusinessSegments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
us-gaap:ConsolidationItems

us-gaap:IncreaseDecreaseInAccountsPayableTrade

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInAccruedTaxesPayable

us-gaap:IncreaseDecreaseInOtherNoncurrentAssets

us-gaap:IncreaseDecreaseInOtherNoncurrentLiabilities

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncrementalCommonSharesAttributableToConversionOfDebtSecurities

us-gaap:IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InterestOnConvertibleDebtNetOfTax

us-gaap:OperatingLeaseCost

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherNoncashIncomeExpense

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForRestructuring
us-gaap:RestructuringCostAndReserve

us-gaap:PaymentsOfDebtExtinguishmentCosts

us-gaap:PaymentsOfOrdinaryDividends

us-gaap:PensionContributions

us-gaap:PreferredStockDividendsAndOtherAdjustments
us-gaap:StatementClassOfStock
us-gaap:PreferredStockDividendsPerShareDeclared

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess

us-gaap:ProceedsFromSaleOfFinanceReceivables

us-gaap:ProceedsFromStockOptionsExercised
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodTax
us-gaap:RestructuringCostAndReserve
us-gaap:RestructuringAndRelatedCostNumberOfPositionsEliminated
us-gaap:RestructuringCostAndReserve, us-gaap:StatementBusinessSegments

us-gaap:RestructuringCharges
us-gaap:ConsolidationItems
us-gaap:IncomeStatementLocation, us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan
us-gaap:RestructuringCostAndReserve
us-gaap:RestructuringCostAndReserve, us-gaap:SubsequentEventType

us-gaap:RestructuringReserveAccrualAdjustment1
us-gaap:RestructuringCostAndReserve

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:StockRepurchasedDuringPeriodValue
us-gaap:StatementEquityComponents

us-gaap:StockholdersEquityOther
us-gaap:StatementEquityComponents
us-gaap:ShareRepurchaseProgram
us-gaap:TreasuryStockAcquiredAverageCostPerShare
us-gaap:ShareRepurchaseProgram
us-gaap:TreasuryStockSharesAcquired
us-gaap:ShareRepurchaseProgram, us-gaap:SubsequentEventType

arnc:AccountsPayableSettlementArrangements

arnc:AmountCommittedUnderOutstandingSuretyBonds

arnc:DeferredTaxAssetsDepreciation

arnc:DeferredTaxLiabilitiesDepreciation

arnc:DeferredTaxLiabilitiesEmployeeBenefits

arnc:DeferredTaxLiabilitiesGross

arnc:DeferredTaxLiabilitiesLossProvisions
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanType
arnc:DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAsset
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
arnc:DefinedBenefitPlanExpectedFutureBenefitPayments
us-gaap:RetirementPlanType
arnc:DefinedBenefitPlanNetAmountRecognizedBeforeTaxEffect
us-gaap:RetirementPlanType
arnc:DefinedBenefitPlanNetFundedStatus
us-gaap:RetirementPlanType
arnc:DefinedBenefitPlanPlanAssetsAmountExcludingCertainNetReceivables

arnc:IncomeTaxExaminationAssessmentOutstanding

arnc:PropertiesPlantsAndEquipmentExcludingConstructionWorkInProgress

arnc:PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
us-gaap:StatementGeographical

arnc:ShortTermDebtExcludingCurrentMaturitiesOfLongtermDebt

us-gaap:AccrualForEnvironmentalLossContingencies
us-gaap:StatementGeographical

us-gaap:AccruedEnvironmentalLossContingenciesCurrent

us-gaap:AdditionalPaidInCapital
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:AllowanceForDoubtfulAccountsReceivable

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:BusinessCombinationContingentConsiderationAsset

us-gaap:ConstructionInProgressGross
us-gaap:LongtermDebtType
us-gaap:DebtInstrumentCarryingAmount
us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:DebtInstrumentFaceAmount
us-gaap:DebtInstrument
us-gaap:DebtInstrumentRepurchaseAmount

us-gaap:DeferredCreditsAndOtherLiabilitiesNoncurrent

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredTaxAssetInterestCarryforward

us-gaap:DeferredTaxAssetsDeferredIncome

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsOther
us-gaap:ValuationAllowancesAndReservesType

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves

us-gaap:DeferredTaxLiabilitiesDeferredExpense

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanBenefitObligation
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
us-gaap:RetirementPlanSponsorLocation
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFairValueOfPlanAssets
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFundedStatusOfPlan
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation
us-gaap:Range
us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1
us-gaap:FinancialInstrument
us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations
us-gaap:ConsolidationItems
us-gaap:DerivativeAssets
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:StatementBusinessSegments
us-gaap:DisposalGroupIncludingDiscontinuedOperationConsideration
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:StatementBusinessSegments, us-gaap:SubsequentEventType

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:Range
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
us-gaap:Range
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
us-gaap:Range
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
us-gaap:Range
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:GoodwillGross
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:GoodwillImpairedAccumulatedImpairmentLoss
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:BalanceSheetLocation, us-gaap:TypeOfArrangement
us-gaap:GuaranteeObligationsMaximumExposure
us-gaap:TypeOfArrangement
us-gaap:GuaranteesFairValueDisclosure
us-gaap:Currency, us-gaap:StatementGeographical
us-gaap:IncomeTaxReceivable
us-gaap:StatementGeographical

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

us-gaap:InterestPayableCurrent

us-gaap:InventoryFinishedGoodsNetOfReserves

us-gaap:InventoryRawMaterialsNetOfReserves

us-gaap:InventorySuppliesNetOfReserves

us-gaap:InventoryWorkInProcessNetOfReserves

us-gaap:LIFOInventoryAmount

us-gaap:LongTermDebtAndCapitalLeaseObligations
us-gaap:FairValueByMeasurementBasis
us-gaap:LongTermDebtFairValue

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLossCarryforwards
us-gaap:ValuationAllowancesAndReservesType
us-gaap:ConsolidationItems
us-gaap:OtherAssets

us-gaap:OtherIntangibleAssetsNet

us-gaap:OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent

us-gaap:OtherReceivablesNetCurrent
us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities

us-gaap:ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount

us-gaap:RestrictedCash
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:StatementBusinessSegments

us-gaap:RestructuringReserve
us-gaap:RestructuringCostAndReserve

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:ShortTermBorrowings
us-gaap:ShareRepurchaseProgram
us-gaap:StockRepurchaseProgramAuthorizedAmount1

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:TaxCreditCarryforwardAmount
us-gaap:ValuationAllowancesAndReservesType

us-gaap:TaxCreditCarryforwardValuationAllowance
us-gaap:TaxCreditCarryforward
us-gaap:ShareRepurchaseProgram
us-gaap:TreasuryStockCommonValue
us-gaap:StatementEquityComponents
us-gaap:TreasuryStockShares

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued

Tables

  2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:CommonStockValue ▁▁▂▄█████▂▂▂433434440453483483483483481442441441
us-gaap:CommonStockSharesOutstanding ▁▁▂▄█████432434440453483483483483481NANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStock432NANANA483NANANA481NANANA
us-gaap:EarningsPerShareBasic █▆▅▇▇▇▇▇▁▆▇█0.710.22-0.270.40.450.330.250.3-1.510.230.440.69
us-gaap:EarningsPerShareDiluted █▆▅▇▇▇▇▇▁▆▇█0.70.21-0.270.390.440.320.240.29-1.510.220.430.65
  2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▄▆█▆▅▆▇▅▂▂▂▁340135573690354034723522360934443271323432603191
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments arnc:Areospace,arnc:EngineeredProductsAndSolutions▆██▆▇▆▆▄▂▁▁▂125212901283125012721244124111901146113011411155
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments arnc:IndustrialAndOther,arnc:GlobalRolledProducts▄▇█▄▁▅▇▅▁▂▄▃501547563503457522553521463474504491
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments arnc:Transportation,arnc:GlobalRolledProducts▄▆▇█▆▇▇▆▃▂▁▂550587632649608625612598523490475493
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments arnc:EngineeredProductsAndSolutions▇█▃▂▄▃▄▂▁▁▁▁173317941565150216131566159615411494147714851487
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments arnc:GlobalRolledProducts▇█▆▅▃▄▄▃▁▁▁▁166717631577150313611426145113661247123412711248
us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization ▁▄█267028002939NA284528812903NANANANANA
us-gaap:ResearchAndDevelopmentExpense ▁▁▂▄▆▆█▅▇▆█▇151617222625292328253028
us-gaap:SellingGeneralAndAdministrativeExpense ▅▄▅▅▁▁▃▄▂▃▇█181167178178140134158172151155204221
us-gaap:OperatingIncomeLoss █▇▄█▇▇▇▇▁▇▇▇416326-81374323345324333-471271281283
 us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems us-gaap:MaterialReconcilingItems█▇▄█▇▇▇▇▁▇▇▇416326-81374323345324333-471271281283
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us-gaap:NetIncomeLoss █▆▅▇▇▇▇▇▁▇▇█30995-121187218161120143-727119212322
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us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted █▇▅▇▇▇▇▇▁▇▇█31897-121190221163123145-784103196324
  2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:Assets ▁▁▂▃▄▃▃▃▄▆▅█175781748417913183611869318327182191821918718192371910620157
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us-gaap:LiabilitiesAndStockholdersEquity ▁▁▂▃▄▃▃▃▄▆▅█175781748417913183611869318327182191821918718192371910620157
us-gaap:StockholdersEquity ▁▁▂▄▆▅▄▄▃█▇▆460746964854516655735361520452684910594857405482
  2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
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us-gaap:InventoryNet ▃▆▇▇▄▇██▄▄▃▁242925552606261224922622265926482480245324162328
us-gaap:InventoryLIFOReserve ▄▅▇████▆▅▄▂▁445471506527530534527495481449401390
us-gaap:PrepaidExpenseAndOtherAssetsCurrent ▄▁▁▄▄▄▅██▇▄▄314259260306314317324379374357305319
  2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:PropertyPlantAndEquipmentGross 11806NANANA11734NANANA11365117911173811633
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us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment ███▆▆▆▅▅▃▂▂▁707470707013681167696778667467216392626562316160
us-gaap:PropertyPlantAndEquipmentNet ▃▁▄██▆▅▆▅▄▄▃546353775517572757045645558256285594552655075473
us-gaap:Goodwill ▁▁▁▁▁▂▂▂▂██▇449344604500450945004517451845734535524652155170
 us-gaap:Goodwill us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,arnc:EngineeredProductsAndForgings4067NANANA4186NANANA4212NANANA
 us-gaap:Goodwill us-gaap:ReportingUnit arnc:ArconicEngines2164NANANA2065NANA2095NANANANA
 us-gaap:Goodwill us-gaap:ReportingUnit arnc:ArconicFasteningSystems1607NANANA1607NANA1623NANANANA
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us-gaap:IntangibleAssetsNetExcludingGoodwill ▁▁▂▆▇▇▇██658668686912919954963990987NANANA
us-gaap:FiniteLivedIntangibleAssetsNet 626NANANA887NANANA955NANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:ComputerSoftwareIntangibleAsset85NANANA111NANANA115NANANA
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 us-gaap:DeferredTaxAssetsLiabilitiesNet us-gaap:ConsolidationItems us-gaap:MaterialReconcilingItems▅▁▄▁▄▅▅▆█608466568480573605626675743NANANA
us-gaap:OtherAssetsNoncurrent ▂▃▃▃▁▁▁▁▂███514605624680416474455458481129312711274
  2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:LiabilitiesCurrent ▇█▅▅▄▃▂▂▂▁▁▁412644603621365935203014297728022824267726582587
us-gaap:LongTermDebtCurrent ▆█▃▃▃▁▁▁▁▁1003140440540540533311NANA
us-gaap:AccountsPayableCurrent ▆▆▇█▇▆▆▄▄▂▂▁204319882095219321292061202418741839165616671597
us-gaap:TaxesPayableCurrent ▄██▇█▃▁▃▂▂▂▃8711511611411884698375747781
us-gaap:OtherLiabilitiesCurrent ▅▆██▁▂▂▂▁▄▃▅418434479481356371362370349412379420
  2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:LongTermDebt ▁▄▄▄▄▄▄▄███59096309630663046301631863156312680768036796NA
us-gaap:LongTermDebtNoncurrent ▁▁▅▅▅▆▆▆███49064905590158995896631563126309680668026796NA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType us-gaap:OtherPostretirementBenefitPlansDefinedBenefit714NANANA723NANANA841NANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType us-gaap:PensionPlansDefinedBenefit2460NANANA2230NANANA2564NANANA
us-gaap:MinorityInterest ██▁▁▁████▄▄▄141412121214141414131313
  2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:StockholdersEquity ▁▁▂▄▆▅▄▄▃█▇▆460746964854516655735361520452684910594857405482
us-gaap:CommonStockValue ▁▁▂▄█████▂▂▂433434440453483483483483481442441441
us-gaap:RetainedEarningsAccumulatedDeficit █▆▆▇▆▃▂▁▁▅▄▃129-179-256-134-358-943-1073-1164-1248-519-567-768
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▁▄▄▄▄▆▆█▆█▇▇-3329-2928-2869-2852-2926-2544-2556-2386-2644-2327-2454-2498
  2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▇▄▅▂▇▄▅▁█▅▅▂50652106-25842651176-436612172217-300
us-gaap:NetCashProvidedByUsedInInvestingActivities ▃▂▂▁▃▁▂▁▁▁▁█29511712942354651172941100691110
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▇▇▂███▄██▁█-424-202-201-741-40-32-35-542-45-15-912-43
  2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▇▄▅▂▇▄▅▁█▅▅▂50652106-25842651176-436612172217-300
us-gaap:NetIncomeLoss █▆▅▇▇▇▇▇▁▇▇█30995-121187218161120143-727119212322
us-gaap:ProfitLoss █▆▅▇▇▇▇▇▁▇▇█30995-121187218161120143-727119212322
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings█▆▅▇▇▇▇▇▁▇▇█30995-121187218161120143-727119212322
us-gaap:DepreciationDepletionAndAmortization ▁▂▄▄█▅▆▆▅▅▄▂129131139137149141144142141140137133
us-gaap:IncreaseDecreaseInInventories ▂▃▄▇▁▃▆█▅▅▆▆-89-25-1118-110-367914124186585
  2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▃▂▂▁▃▁▂▁▁▁▁█29511712942354651172941100691110
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▄▁▂▄█▅▄▂▇▂▂▁171111136168271209171117236131126103
  2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▇▇▂███▄██▁█-424-202-201-741-40-32-35-542-45-15-912-43
us-gaap:RepaymentsOfLongTermDebt ▄▁▁▂▂▂▂▅▂▂█▃5037775151151151150651150151973360
us-gaap:PaymentsForRepurchaseOfCommonStock ▂▃▃█▁▁▁▁502002007000000NANANANA
  2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
us-gaap:RepaymentsOfLongTermDebt ▄▁▁▂▂▂▂▅▂▂█▃5037775151151151150651150151973360
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument arnc:IowaAuthorityLoan0.0475NANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:SubsequentEventType arnc:OnePointSixThreePercentConvertibleNotesDueTwoThousandNineteen,us-gaap:SubsequentEventNANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:SubsequentEventType arnc:SecondLienNotesDue2028,us-gaap:SubsequentEventNANANANANANANANANANANANA

Stockholders Equity Note Stock Split Conversion Ratio1

Stock Issued During Period Shares Reverse Stock Splits

Stock Issued During Period Shares Period Increase Decrease

Common Stock Value

us-gaap:CommonStockValue



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value4334344404534834834834834814424414414384381391139113911391130413041304126712671267117811781178117811781178117811781178117811781178114111411141109710971097925
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.52.52.52.52.62.62.72.72.62.32.32.22.21.23.83.83.83.83.63.73.53.43.53.63.33.13.12.92.92.93.02.92.93.02.82.92.93.03.02.92.92.92.4

Common Stock Par Or Stated Value Per Share

Common Stock Shares Issued

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-10-052016-10-042015-12-312014-12-312014-09-302013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value43243444045348348348348348143840013001310121611771071106710641022974800
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:CommonStock



Period End2019-12-312018-12-312017-12-312016-12-312016-10-052016-10-042015-12-31
Value43248348143840013001310
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Authorized

Weighted Average Number Of Diluted Shares Outstanding

Weighted Average Number Of Shares Outstanding Basic

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-30
Value0.710.22-0.270.40.450.330.250.3-1.510.230.440.69-2.910.340.090.0-0.550.020.10.150.120.130.12-0.16-2.190.02-0.110.140.23-0.130.09-0.180.160.30.290.250.060.13-0.2-0.280.08-0.47-0.61-1.46000000000000020.330.67
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-30
Value0.70.21-0.270.390.440.320.240.29-1.510.220.430.65-2.910.330.090.0-0.550.020.10.140.110.120.12-0.16-2.190.02-0.110.130.21-0.130.09-0.180.150.280.270.240.060.13-0.2-0.280.08-0.47-0.61-1.45000000000000020.330.66
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Income Loss From Continuing Operations Per Basic Share

Income Loss From Continuing Operations Per Diluted Share

Revenues

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value340135573690354034723522360934443271323432603191
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

arnc:Areospace, arnc:EngineeredProductsAndSolutions



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value125212901283125012721244124111901146113011411155
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.836.334.835.336.635.334.434.635.034.935.036.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.836.334.835.336.635.334.434.635.034.935.036.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax arnc:Areospace arnc:EngineeredProductsAndSolutions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arnc:Areospace, arnc:GlobalRolledProducts



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value320300328302246220226199213214241215
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.48.48.98.57.16.26.35.86.56.67.46.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.48.48.98.57.16.26.35.86.56.67.46.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax arnc:Areospace arnc:GlobalRolledProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arnc:BuildingAndConstruction, arnc:GlobalRolledProducts



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value29632954495059604848565149
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.79.21.51.41.41.71.71.41.51.71.61.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.79.21.51.41.41.71.71.41.51.71.61.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax arnc:BuildingAndConstruction arnc:GlobalRolledProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arnc:IndustrialAndOther, arnc:EngineeredProductsAndSolutions



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value196185197165227212236254253249247239
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.85.25.34.76.56.06.57.47.77.77.67.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.85.25.34.76.56.06.57.47.77.77.67.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax arnc:IndustrialAndOther arnc:EngineeredProductsAndSolutions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arnc:IndustrialAndOther, arnc:GlobalRolledProducts



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value501547563503457522553521463474504491
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.715.415.314.213.214.815.315.114.214.715.515.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.715.415.314.213.214.815.315.114.214.715.515.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax arnc:IndustrialAndOther arnc:GlobalRolledProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arnc:Transportation, arnc:EngineeredProductsAndSolutions



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value28531985871141101199795989793
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.49.02.32.53.33.13.32.82.93.03.02.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.49.02.32.53.33.13.32.82.93.03.02.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax arnc:Transportation arnc:EngineeredProductsAndSolutions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arnc:Transportation, arnc:GlobalRolledProducts



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value550587632649608625612598523490475493
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.216.517.118.317.517.717.017.416.015.214.615.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.216.517.118.317.517.717.017.416.015.214.615.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax arnc:Transportation arnc:GlobalRolledProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

arnc:EngineeredProductsAndSolutions



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value173317941565150216131566159615411494147714851487
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax51.050.442.442.446.544.544.244.745.745.745.646.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax51.050.442.442.446.544.544.244.745.745.745.646.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax arnc:EngineeredProductsAndSolutions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arnc:GlobalRolledProducts



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value166717631577150313611426145113661247123412711248
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax49.049.642.742.539.240.540.239.738.138.239.039.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax49.049.642.742.539.240.540.239.738.138.239.039.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax arnc:GlobalRolledProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenue From Contract With Customer Including Assessed Tax

Sales Revenue Goods Net

Cost Of Goods And Service Excluding Depreciation Depletion And Amortization

us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization



Period End2019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value267028002939284528812903
Percentage of CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax78.578.779.681.981.880.4

Cost Of Goods Sold Excluding Depreciation Depletion And Amortization

Cost Of Goods Sold

Gross Profit

Costs And Expenses

Research And Development Expense

us-gaap:ResearchAndDevelopmentExpense



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-30
Value151617222625292328253028133839426055685560575051574446455651474347464340453951393841616161
Percentage of ResearchAndDevelopmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.40.50.60.70.70.80.70.90.80.90.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-30
Value181167178178140134158172151155204221121275286260262261224232271243245236255248254251277234245241261253245232208239291234240244273275298
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.34.74.85.04.03.84.45.04.64.86.36.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value416326-81374323345324333-47127128128329237283
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.29.2-2.210.69.39.89.09.7-14.48.48.68.90.00.00.0

us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value416326-81374323345324333-47127128128329237283
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.29.2-2.210.69.39.89.09.7-14.48.48.68.90.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense

us-gaap:InterestExpense



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-192017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-30
Value8286858587888911498100241831151101331291271291231241221221261051201121081181151201241231231251631111391191181211201151141259687
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.42.42.32.42.52.52.53.33.03.10.05.63.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value828685858788891149810018311571868483848080808081697873707675
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.064.564.765.165.465.165.064.565.665.664.365.765.065.264.864.465.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.42.42.32.42.52.52.53.33.03.15.63.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense Debt

Other Nonoperating Income Expense

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value78-87-3026-51-16-2011223859967-23920277410171-1188229-1207-802-1000200336-347-36-852-10029238-872309-152-1459461
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.3-2.4-0.80.7-1.5-0.5-5.63.50.12.63.02.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Loss From Continuing Operations

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-312008-12-312008-09-30
Value30995-121187218161120143-727119212322-12916653110257-175-1999225381367109171-172-257120-470-929390
Percentage of IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.12.7-3.35.36.34.63.34.2-22.23.76.510.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Loss From Continuing Operations Before Income Taxes Domestic

Income Loss From Continuing Operations Before Income Taxes Foreign

Income Loss From Continuing Operations Attributable To Noncontrolling Entity

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-30
Value-30-31-29-32-10-8-41-201141171354-2611737-34-29150126-23-5-25107-19273452-2216-315028-4316-21-2112389-3036-1596
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.9-0.9-0.8-0.9-0.3-0.2-1.1-0.63.50.05.211.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-30-31-29-32-10-8-41-20114117135454111712
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0-207.79.445.9-35.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.9-0.9-0.8-0.9-0.3-0.2-1.1-0.63.50.05.211.10.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-30
Value-5114-747088874562725357162114714715230441007522612019978-77312312164143-33133955136138-495784-137-22-108-307-238136232
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.13.2-2.02.00.22.52.11.68.31.61.75.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Taxes Paid Net

Profit Loss

us-gaap:ProfitLoss



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-312008-12-312008-09-30
Value30995-121187218161120143-727119212322-125318617811-765106207255114131129-197-231044-148170257-175-1999225377366109170-179-268124-487-1191352
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.12.7-3.35.36.34.63.34.2-22.23.76.510.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-312008-12-312008-09-30
Value30995-121187218161120143-727119212322-125816613516-70144140195159149138-178-233924-119149242-143-29417232230861136-201-27777-497-1191268
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.489.275.8145.591.641.567.676.5139.5113.7107.090.4101.354.580.487.694.281.710.594.976.485.484.256.080.0112.3103.462.1102.1100.076.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.12.7-3.35.36.34.63.34.2-22.23.76.510.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312009-09-302009-06-302008-09-302008-06-30
Value-9236-138263203173-50401-1042246256392-1523-423188373-580-749863-907-897-762314250-233484-871282-357-36-678385-1135-9901051698463357-903875
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.71.0-3.77.45.84.9-1.411.6-31.97.67.912.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

Net Income Loss

us-gaap:NetIncomeLoss



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-30
Value30995-121187218161120143-727119212322-125816613516-70144140195159149138-178-233924-119149242-143-294-19117232230825861136-201-27777-454-497-1191268546
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.12.7-3.35.36.34.63.34.2-22.23.76.510.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value30994-121186218160120142-727101194305-1275148118-2-71826123178139149138-179-233923-119148242-144-293
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.12.6-3.35.36.34.53.34.1-22.23.16.09.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Diluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value31897-121190221163123145-784103196324-1275150120-2-71826123178139149138-179-233923-119156242-144-2101
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.42.7-3.35.46.44.63.44.2-24.03.26.010.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Attributable To Noncontrolling Interest

Assets

us-gaap:Assets



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value17578174841791318361186931832718219182191871819237191062015720038374483613936140365283658736587356943739937122363093560535742382293855140106401794019139498407034012039598414664033639293383703783538472380993764837822
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:OperatingSegments



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value14941152811561116127153691572515687158621549915415296663123229247
Percentage of Assets85.087.487.187.882.285.886.187.182.876.981.283.581.8
Percentage of Assets85.087.487.187.882.285.886.187.182.876.981.283.581.8
Percentage of Assets us-gaap:OperatingSegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

arnc:EngineeredProductsAndForgings



Period End2019-12-312018-12-31
Value1003410494
Percentage of Assets57.156.1
Percentage of Assets57.156.1
Percentage of Assets arnc:EngineeredProductsAndForgings100.0100.0

arnc:GlobalRolledProducts



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value490751014714476839344112415341933955
Percentage of Assets27.929.226.326.021.022.422.823.021.1
Percentage of Assets27.929.226.326.021.022.422.823.021.1
Percentage of Assets arnc:GlobalRolledProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value12957127741304713183131081295213001129371379413276133531466214897235032161021779223972189621949218512260521987216032123122220223652269323332236562333722584230772292521315220972193222207215922198522912218812206723490
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets73.773.172.871.870.170.771.471.073.769.069.972.774.362.859.860.361.359.860.061.260.459.259.559.662.258.558.958.258.958.157.256.757.153.853.354.456.556.358.159.657.458.662.1

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value17578174841791318361186931832718219182191871819237191062015720038374483613936140365283658736587356943739937122363093560535742382293855140106401794019139498407034012039598414664033639293383703783538472380993764837822
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value4607469648545166557353615204526849105948574054825115117751233512226120461259412314115741230612396116771139110593128561281513421131991357013658141421384414919156521477413611133531266912420132341281711735
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets26.226.927.128.129.829.328.628.926.230.930.027.225.531.434.133.833.034.433.732.432.933.432.232.029.633.633.233.532.933.834.634.734.537.737.736.634.634.833.532.334.734.031.0

Assets Current

us-gaap:AssetsCurrent



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value5842590860186053658161326075589563786148603367105892936880937665795385927829772282699689738767656969704972377768770077757767788377137670786872096869651966197022703274598150
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets33.233.833.633.035.233.533.332.434.132.031.633.329.425.022.421.221.823.521.421.622.126.120.319.019.518.418.819.419.219.319.719.419.219.419.017.917.517.017.518.318.519.821.5

Cash

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-302007-12-312006-12-31
Value1648132113571319227715351455120521501815178525531863186319291384191917391311119118773272118366514371017120215551861143217121749193913321260887154384313441292148110668511131762831815483506
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.47.67.67.212.28.48.06.611.59.49.312.79.35.05.33.85.34.83.63.35.08.83.31.94.02.73.13.94.63.64.34.34.83.43.02.23.92.20.03.43.82.82.30.02.00.00.00.00.0

us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value1648132113571319227715351455120521501863191918771437
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.47.67.67.212.28.48.06.611.59.35.35.04.0
Percentage of Assets us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.00.00.00.00.00.0

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value96711161155117010471147115911791035115011701148974167515951556134015251558146913951480138113791221142213541680139916191575152615711915208320011565197116471529172316111883
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.56.46.46.45.66.36.46.55.56.06.15.74.94.54.44.33.74.24.34.13.74.03.83.93.43.73.54.23.54.04.03.73.94.85.05.04.05.14.44.04.54.35.0

Inventory Net

us-gaap:InventoryNet



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value2429255526062612249226222659264824802453241623282253345534383549344235593160317330823138322730672705289329052982282529733051309728993172320129952562243523942328251624933238
Percentage of InventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets13.814.614.514.213.314.314.614.513.212.812.611.511.29.29.59.89.49.78.68.98.28.58.98.67.67.67.57.47.07.47.77.67.28.07.77.46.56.36.36.16.66.68.6

Inventory L I F O Reserve

us-gaap:InventoryLIFOReserve



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312010-09-302009-12-31
Value445471506527530534527495481449401390371567567553559625700757767691746717
Percentage of InventoryLIFOReserve100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.52.72.82.92.82.92.92.72.62.32.11.91.91.51.61.51.51.71.92.12.11.91.91.9

Other Assets Current

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value31425926030631431732437937435730531932558063770573011001112118011821009
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.81.51.51.71.71.71.82.12.01.91.61.61.61.51.82.02.03.03.03.33.22.8

Land

Machinery And Equipment Gross

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross



Period End2019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value11806117341136511791117381163310789349433444134421323823323734277338643405136747378973740535299373263726138378363833771837219384293611137343389393812035254368023575735525349323384431301
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets67.262.860.761.361.457.753.893.395.395.288.690.893.794.991.099.0104.4105.198.897.696.795.790.693.894.294.490.094.393.994.589.795.994.592.391.789.982.8

us-gaap:ConsolidationItems, us-gaap:PropertyPlantAndEquipmentByType

us-gaap:MaterialReconcilingItems, us-gaap:MachineryAndEquipment



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value378420358337750820859
Percentage of PropertyPlantAndEquipmentGross3.23.63.23.12.32.42.4
Percentage of Assets2.22.21.91.72.12.22.4
Percentage of Assets us-gaap:MaterialReconcilingItems us-gaap:MachineryAndEquipment0.00.00.00.00.00.00.0

us-gaap:MaterialReconcilingItems, us-gaap:ManufacturingFacility



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value269252253248619715755
Percentage of PropertyPlantAndEquipmentGross2.32.12.22.31.92.12.1
Percentage of Assets1.51.31.41.21.71.92.1
Percentage of Assets us-gaap:MaterialReconcilingItems us-gaap:ManufacturingFacility0.00.00.00.00.00.00.0

us-gaap:ConsolidationItems, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, us-gaap:MachineryAndEquipment, arnc:EngineeredProductsAndForgings



Period End2019-12-312018-12-31
Value35143433
Percentage of PropertyPlantAndEquipmentGross29.829.3
Percentage of Assets20.018.4
Percentage of Assets us-gaap:OperatingSegments us-gaap:MachineryAndEquipment arnc:EngineeredProductsAndForgings0.00.0

us-gaap:OperatingSegments, us-gaap:MachineryAndEquipment, arnc:GlobalRolledProducts



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value54014629464145704500
Percentage of PropertyPlantAndEquipmentGross45.739.440.842.413.9
Percentage of Assets30.724.824.822.812.3
Percentage of Assets us-gaap:OperatingSegments us-gaap:MachineryAndEquipment arnc:GlobalRolledProducts0.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:ManufacturingFacility, arnc:EngineeredProductsAndForgings



Period End2019-12-312018-12-31
Value812769
Percentage of PropertyPlantAndEquipmentGross6.96.6
Percentage of Assets4.64.1
Percentage of Assets us-gaap:OperatingSegments us-gaap:ManufacturingFacility arnc:EngineeredProductsAndForgings0.00.0

us-gaap:OperatingSegments, us-gaap:ManufacturingFacility, arnc:GlobalRolledProducts



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value13041068109010611042
Percentage of PropertyPlantAndEquipmentGross11.09.19.69.83.2
Percentage of Assets7.45.75.85.32.9
Percentage of Assets us-gaap:OperatingSegments us-gaap:ManufacturingFacility arnc:GlobalRolledProducts0.00.00.00.00.0

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Land



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value128133136137136138139142140135481548639
Percentage of PropertyPlantAndEquipmentGross1.10.00.00.01.20.00.00.01.21.31.51.61.8
Percentage of Assets0.70.80.80.70.70.80.80.80.70.71.31.51.8
Percentage of Assets us-gaap:Land0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:MachineryAndEquipment



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value9293922492499267923492449148922288308358215612220322770
Percentage of PropertyPlantAndEquipmentGross78.70.00.00.078.70.00.00.077.777.566.665.264.5
Percentage of Assets52.952.851.650.549.450.450.250.647.241.759.059.463.7
Percentage of Assets us-gaap:MachineryAndEquipment0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ManufacturingFacility



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value2385236423952296103401130011890
Percentage of PropertyPlantAndEquipmentGross20.220.121.121.331.933.233.7
Percentage of Assets13.612.612.811.528.330.233.3
Percentage of Assets us-gaap:ManufacturingFacility0.00.00.00.00.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value7074707070136811676967786674672163926265623161606073198211942419405188721848519003185761909120031202861979219227194651915019422191901886018483188131840417872182161775317285168881609015697153401481113846
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets40.240.439.237.136.237.036.636.934.132.632.630.630.352.953.753.751.750.551.952.051.054.055.955.653.850.949.748.447.846.946.846.245.945.143.944.044.044.042.540.840.339.336.6

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet



Period End2019-12-312019-09-302019-06-302019-03-312019-01-012018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value546353775517572724570456455582562855945526550754735499151221501715016148151475215274152881642616716176111761317639178611811118956189471885818736196161941619471207232036720161199141966719828195921903317455
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets31.130.830.831.20.030.530.830.630.929.928.728.827.227.440.441.641.540.640.341.742.843.945.048.549.549.446.747.047.347.246.947.448.248.449.250.050.551.351.952.051.551.450.646.2

us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value326320302308305307304307310308733819879
Percentage of PropertyPlantAndEquipmentNet6.06.05.55.45.35.45.45.55.55.64.95.05.0
Percentage of Assets1.91.81.71.71.61.71.71.71.71.52.02.22.5
Percentage of Assets us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.00.00.00.00.00.0

Long Term Investments

Goodwill

us-gaap:Goodwill



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value4493446045004509450045174518457345355246521551705148538453965402540154435232505052473389343534233415514451135123517051755141527152515271532953635119512850655051504850324981
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets25.625.525.124.624.124.624.825.124.227.327.325.625.714.414.914.914.814.914.314.114.09.19.59.69.613.513.312.812.912.913.012.913.113.312.913.313.013.413.413.113.213.413.2

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, arnc:EngineeredProductsAndForgings



Period End2019-12-312018-12-312017-12-31
Value406741864212
Percentage of Goodwill90.593.092.9
Percentage of Assets23.122.422.5
Percentage of Assets us-gaap:OperatingSegments arnc:EngineeredProductsAndForgings0.00.00.0

us-gaap:OperatingSegments, arnc:GlobalRolledProducts



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value426245193181201
Percentage of Goodwill9.55.44.33.53.7
Percentage of Assets2.41.31.00.90.6
Percentage of Assets us-gaap:OperatingSegments arnc:GlobalRolledProducts0.00.00.00.00.0

us-gaap:ReportingUnit

arnc:ArconicEngineeredStructures



Period End2019-12-312018-12-312018-03-31
Value289507517
Percentage of Goodwill6.411.311.3
Percentage of Assets1.62.72.8
Percentage of Assets arnc:ArconicEngineeredStructures0.00.00.0

arnc:ArconicEngines



Period End2019-12-312018-12-312018-03-31
Value216420652095
Percentage of Goodwill48.245.945.8
Percentage of Assets12.311.011.5
Percentage of Assets arnc:ArconicEngines0.00.00.0

arnc:ArconicFasteningSystems



Period End2019-12-312018-12-312018-03-31
Value160716071623
Percentage of Goodwill35.835.735.5
Percentage of Assets9.18.68.9
Percentage of Assets arnc:ArconicFasteningSystems0.00.00.0

arnc:ArconicForgedWheels



Period End2019-12-31
Value7
Percentage of Goodwill0.2
Percentage of Assets0.0
Percentage of Assets arnc:ArconicForgedWheels0.0

us-gaap:StatementBusinessSegments

arnc:EngineeredProductsAndForgings



Period End2019-12-312019-09-302018-12-31
Value406774186
Percentage of Goodwill90.50.293.0
Percentage of Assets23.10.022.4
Percentage of Assets arnc:EngineeredProductsAndForgings40.50.039.9

arnc:GlobalRolledProducts



Period End2019-12-312019-09-302018-12-312017-12-312016-12-312015-12-312014-12-31
Value42668245252181201210
Percentage of Goodwill9.51.55.45.63.53.74.0
Percentage of Assets2.40.41.31.30.90.60.6
Percentage of Assets arnc:GlobalRolledProducts8.71.36.26.40.00.00.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value6586686869129199549639909871794213716451267118711991187
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.73.83.85.04.95.25.35.45.39.05.94.43.53.03.03.0

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value626887955806979908868780-705512590
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.64.75.14.02.72.42.41.9-1.81.31.5

us-gaap:FiniteLivedIntangibleAssetsByMajorClass

arnc:PatentLicenseAgreement



Period End2019-12-312018-12-312017-12-31
Value233
Percentage of FiniteLivedIntangibleAssetsNet0.30.30.3
Percentage of Assets0.00.00.0
Percentage of Assets arnc:PatentLicenseAgreement0.00.00.0

us-gaap:ComputerSoftwareIntangibleAsset



Period End2019-12-312018-12-312017-12-31
Value85111115
Percentage of FiniteLivedIntangibleAssetsNet13.612.512.0
Percentage of Assets0.50.60.6
Percentage of Assets us-gaap:ComputerSoftwareIntangibleAsset0.00.00.0

us-gaap:OtherIntangibleAssets



Period End2019-12-312018-12-312017-12-31
Value539773837
Percentage of FiniteLivedIntangibleAssetsNet86.187.187.6
Percentage of Assets3.14.14.5
Percentage of Assets us-gaap:OtherIntangibleAssets0.00.00.0

Deferred Tax Assets Liabilities Net

us-gaap:ConsolidationItems

us-gaap:DeferredTaxAssetsLiabilitiesNet

us-gaap:MaterialReconcilingItems



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value6084665684805736056266757431234266831753410
Percentage of DeferredTaxAssetsLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.52.73.22.63.13.33.43.74.06.27.38.59.5
Percentage of Assets us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent



Period End2019-12-312019-09-302019-06-302019-03-312019-01-012018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value514605624680224164744554584811293127112741245303534153635400638883806321827592401265426462628264625532680271230582636256825682527262525612521244923882419266625262386
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.93.53.53.70.02.22.62.52.52.66.76.76.36.28.19.410.111.010.610.49.07.46.57.37.47.46.96.66.76.77.66.76.36.46.46.36.36.46.46.36.37.06.76.3

Liabilities Current

us-gaap:LiabilitiesCurrent



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value4126446036213659352030142977280228242677265825872749550054885555521151475206506455415354584252676105604061476500594265316151629260135623580057175236468251445414501750557279
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets23.525.520.219.918.816.416.315.415.113.913.912.813.714.715.215.414.314.114.214.214.814.416.114.817.115.815.916.214.816.215.615.515.014.214.014.213.312.213.614.113.213.419.2

Long Term Debt Current

us-gaap:LongTermDebtCurrent



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312009-06-302008-12-31
Value10031404405405405333114212965546544523166911556
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.78.02.32.22.20.00.00.00.00.00.00.10.11.81.21.10.61.70.30.1

Accounts Payable Current

us-gaap:AccountsPayableCurrent



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302008-12-31
Value204319882095219321292061202418741839165616671597174427392665265728892734300929343152297930232853296028162920286027022590263327342692248026052488232219711868195418502518
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.611.411.711.911.411.211.110.39.88.68.77.98.77.37.47.47.97.58.28.28.48.08.38.08.37.47.67.16.76.46.76.76.76.36.36.25.95.14.95.14.96.7

Taxes Payable Current

us-gaap:TaxesPayableCurrent



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302008-12-31
Value871151161141188469837574778185217206274239421383357348275351310376398414438366405406479438510506475461397371345363378
Percentage of TaxesPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.70.60.60.60.50.40.50.40.40.40.40.40.60.60.80.71.21.01.00.90.71.00.91.11.01.11.10.91.01.01.21.11.31.21.21.21.01.00.91.01.0

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value4184344794813563713623703494123794203299091000103311749819368901021958108810871044109312051090129813441175104511671024119911071201109112741218832952987
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.42.52.72.61.92.02.02.01.92.12.02.11.62.42.82.93.22.72.62.52.72.63.03.12.92.93.12.73.23.33.02.62.92.62.92.73.12.83.43.22.22.52.6

Long Term Debt

us-gaap:LongTermDebt



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312015-12-312014-12-312014-09-302013-12-312012-12-312011-12-312010-12-312009-12-31
Value59096309630663046301631863156312680768036796804890658798125082628776908590739643
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets33.636.135.234.333.734.534.734.636.435.435.640.224.823.53.423.121.822.623.125.1

us-gaap:DebtInstrument

arnc:OnePointSixThreePercentConvertibleNotesDueTwoThousandNineteen



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312015-12-31
Value0403403403403403403403403403403403403
Percentage of LongTermDebt0.06.46.46.46.46.46.46.45.95.95.95.04.4
Percentage of Assets0.02.32.22.22.22.22.22.22.22.12.12.01.1
Percentage of Assets arnc:OnePointSixThreePercentConvertibleNotesDueTwoThousandNineteen0.00.00.00.00.00.00.00.00.00.00.00.00.0

arnc:Other



Period End2019-12-312018-12-31
Value1829
Percentage of LongTermDebt0.30.5
Percentage of Assets0.10.2
Percentage of Assets arnc:Other0.00.0

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312009-06-302008-12-31
Value490649055901589958966315631263096806680267968044904487697607831186408842897493878509
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets27.928.132.932.131.534.534.634.636.435.435.640.124.823.421.320.721.522.523.324.922.5

Deferred Tax Liabilities Noncurrent

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:RetirementPlanType

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value714723841889
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent100.0100.0100.0100.0
Percentage of Assets4.13.94.54.4
Percentage of Assets us-gaap:OtherPostretirementBenefitPlansDefinedBenefit0.00.00.00.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value2460223025642345
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent344.5308.4304.9263.8
Percentage of Assets14.011.913.711.7
Percentage of Assets us-gaap:PensionPlansDefinedBenefit0.00.00.00.0

Minority Interest

us-gaap:MinorityInterest



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value14141212121414141413131326217021942135208520972324226924882739302929832929300830433353332432843256348433513364371736303475342531813100298427642597
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.15.86.15.95.75.76.46.46.77.48.38.48.27.97.98.48.38.28.28.68.48.59.09.08.88.98.48.17.87.36.9

Other Liabilities Noncurrent

Stockholders Equity

us-gaap:StockholdersEquity



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value4607469648545166557353615204526849105948574054825115117751233512226120461259412314115741230612396116771139110593128561281513421131991357013658141421384414919156521477413611133531266912420132341281711735
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets26.226.927.128.129.829.328.628.926.230.930.027.225.531.434.133.833.034.433.732.432.933.432.232.029.633.633.233.532.933.834.634.734.537.737.736.634.634.833.532.334.734.031.0

Common Stock Value

us-gaap:CommonStockValue



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value4334344404534834834834834814424414414384381391139113911391130413041304126712671267117811781178117811781178117811781178117811781178114111411141109710971097925
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.52.52.52.52.62.62.72.72.62.32.32.22.21.23.83.83.83.83.63.73.53.43.53.63.33.13.12.92.92.93.02.92.93.02.82.92.93.03.02.92.92.92.4

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value129-179-256-134-358-943-1073-1164-1248-519-567-768-1027894088718753883495539605952093799276916390619272116111165311805116891144711655116901162911820117141142411149109221078711020112971128112400
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.7-1.0-1.4-0.7-1.9-5.1-5.9-6.4-6.7-2.7-3.0-3.8-5.123.924.524.224.226.126.326.725.125.025.225.425.930.430.229.429.128.529.528.729.029.828.228.328.428.528.528.629.730.032.8

Treasury Stock Value

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value-3329-2928-2869-2852-2926-2544-2556-2386-2644-2327-2454-2498-2568-5858-5215-5175-5431-5532-4966-5591-4667-3836-3168-3301-3659-3714-3783-3309-3402-2777-2878-2406-2627-1725-858-1418-1675-1688-2223-2092-1559-1945-3169
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-18.9-16.7-16.0-15.5-15.7-13.9-14.0-13.1-14.1-12.1-12.8-12.4-12.8-15.6-14.4-14.3-14.9-15.1-13.6-15.7-12.5-10.3-8.7-9.3-10.2-9.7-9.8-8.3-8.5-6.9-7.3-5.9-6.5-4.4-2.1-3.5-4.3-4.4-5.9-5.4-4.1-5.2-8.4

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-30
Value50652106-25842651176-436612172217-300662306332-430865420472-175-551920214514-70933263-236-2361991124184328-271608-93
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.91.52.9-7.312.31.44.9-12.718.75.36.7-9.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-30
Value29511712942354651172941100691110-240-425-304-276-285207-262-350-552-208-500276-633136-1023-857
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.73.33.51.210.21.83.20.81.33.12.134.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-30
Value-424-202-201-741-40-32-35-542-45-15-912-4310-65-93-56847-712-282394125-180-210-254-25033771004
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-12.5-5.7-5.4-20.9-1.2-0.9-1.0-15.7-1.4-0.5-28.0-1.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-30
Value50652106-25842651176-436612172217-300662306332-430865420472-175-551920214514-70933263-236-2361991124184328-271608-93
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.91.52.9-7.312.31.44.9-12.718.75.36.7-9.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-30
Value30995-121187218161120143-727119212322-125816613516-70144140195159149138-178-233924-119149242-143-294-19117232230825861136-201-27777-454-497-1191268546
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.12.7-3.35.36.34.63.34.2-22.23.76.510.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-312008-12-312008-09-30
Value30995-121187218161120143-727119212322-125318617811-765106207255114131129-197-231044-148170257-175-1999225377366109170-179-268124-487-1191352
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.12.7-3.35.36.34.63.34.2-22.23.76.510.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-312008-12-312008-09-30
Value30995-121187218161120143-727119212322-125816613516-70144140195159149138-178-233924-119149242-143-29417232230861136-201-27777-497-1191268
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.489.275.8145.591.641.567.676.5139.5113.7107.090.4101.354.580.487.694.281.710.594.976.485.484.256.080.0112.3103.462.1102.1100.076.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.12.7-3.35.36.34.63.34.2-22.23.76.510.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-312009-12-312009-03-312008-12-31
Value129131139137149141144142141140137133194316313309321318320321336346350340350348363361363366369361358369283291
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Inventories

us-gaap:IncreaseDecreaseInInventories



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-30
Value-89-25-1118-110-36791412418658536-10-5558-112-45-45266-13028155302-166-34-7182-161-123153355105-205-111-419-523-268272
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-30
Value29511712942354651172941100691110-240-425-304-276-285207-262-350-552-208-500276-633136-1023-857
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.73.33.51.210.21.83.20.81.33.12.134.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-30
Value1711111361682712091711172361311261033112862772513982682672474692832582094222502862353983022702042213633704164681008872
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments To Acquire Investments

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-30
Value-424-202-201-741-40-32-35-542-45-15-912-4310-65-93-56847-712-282394125-180-210-254-25033771004
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-12.5-5.7-5.4-20.9-1.2-0.9-1.0-15.7-1.4-0.5-28.0-1.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Proceeds From Issuance Of Long Term Debt

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-012012-03-312012-01-312011-05-312011-03-312010-08-312010-09-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-30
Value50377751511511511506511501519733601410442441441479514518519656851863133732557563969613432241432297233878878861258221122
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312009-12-312009-09-302008-12-312008-09-30
Value502002007000000000477
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.00.00.00.00.00.00.00.0100.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-012012-03-312012-01-312011-05-312011-03-312010-08-312010-09-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-30
Value50377751511511511506511501519733601410442441441479514518519656851863133732557563969613432241432297233878878861258221122
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Debt Instrument Interest Rate Stated Percentage

us-gaap:DebtInstrument

us-gaap:DebtInstrumentInterestRateStatedPercentage

arnc:IowaAuthorityLoan



Period End2019-12-31
Value0.0475
Percentage of DebtInstrumentInterestRateStatedPercentage100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations arnc:IowaAuthorityLoan0.0

us-gaap:DebtInstrument, us-gaap:SubsequentEventType

arnc:OnePointSixThreePercentConvertibleNotesDueTwoThousandNineteen, us-gaap:SubsequentEvent



Period End2019-10-15
Value0.0163
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations arnc:OnePointSixThreePercentConvertibleNotesDueTwoThousandNineteen us-gaap:SubsequentEvent0.0

arnc:SecondLienNotesDue2028, us-gaap:SubsequentEvent



Period End2020-02-07
Value0.06125
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations arnc:SecondLienNotesDue2028 us-gaap:SubsequentEvent0.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-30
Value-0.2560.086000000000000020.093999999999999970.259-0.0050000000000000044-0.00500000000000000440.00500000000000000440.2650.87200000000000010.0010000000000000009-0.032000000000000030.3161.38000000000000010.4850.2660.47-0.115999999999999990.6030.3770.281-0.8730.4130.1650.2740.2490.1592.1670.2830.1960.2630.2740.8170.250.9550.224
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:EmployeeStockOption



Period End2019-12-312018-12-312017-12-31
Value71011
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:EmployeeStockOption



Period End2019-12-312018-12-312017-12-312016-12-31
Value25.7524.9523.9424.14
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period

Share Based Compensation

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1704184319079192305180016741594150514411468
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value22632336250320144487458945845002465043734257
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ValuationAllowancesAndReservesType

arnc:ExpiresWithinElevenToTwentyYears



Period End2019-12-312018-12-312017-12-312016-12-31
Value128244232170
Percentage of DeferredTaxAssetsNet5.710.49.38.4

arnc:ExpiresWithinTenYears



Period End2019-12-312018-12-312017-12-312016-12-31
Value414514544
Percentage of DeferredTaxAssetsNet1.81.95.82.2

arnc:NoExpiration



Period End2019-12-312018-12-312017-12-312016-12-31
Value106910841161210
Percentage of DeferredTaxAssetsNet47.246.446.410.4

arnc:OtherDeferredTaxAssets



Period End2019-12-312018-12-312017-12-312016-12-31
Value10259639651590
Percentage of DeferredTaxAssetsNet45.341.238.678.9

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value1971667328433563665146482433
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value225624862584194020371668180414001398861908
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ValuationAllowancesAndReservesType

arnc:ExpiresWithinElevenToTwentyYears



Period End2019-12-312018-12-312017-12-31
Value176287646
Percentage of DeferredTaxAssetsValuationAllowance7.811.525.0

arnc:ExpiresWithinTenYears



Period End2019-12-312018-12-312017-12-31
Value711752467
Percentage of DeferredTaxAssetsValuationAllowance31.530.218.1

arnc:NoExpiration



Period End2019-12-312018-12-312017-12-31
Value130613901376
Percentage of DeferredTaxAssetsValuationAllowance57.955.953.3

arnc:OtherDeferredTaxAssets



Period End2019-12-312018-12-312017-12-31
Value635795
Percentage of DeferredTaxAssetsValuationAllowance2.82.33.7

Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset



Period End2019-12-312019-09-302019-06-302019-03-312019-01-01
Value252256277302320
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0

Cash And Cash Equivalents Period Increase Decrease

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value17031324136013262282154214601208215318201790255418781957
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Proceeds From Repayments Of Short Term Debt

arnc:DeferredPriceCustomerReceivables



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312012-03-30
Value-21535-4430-12849-7320-51163219-79254
Percentage of DeferredPriceCustomerReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReportingUnit, us-gaap:SubsequentEventType

arnc:GlobalRolledProducts, us-gaap:SubsequentEvent



Period End2020-01-02
Value282
Percentage of DeferredPriceCustomerReceivables0.0

arnc:DefinedBenefitPensionPlansNetPeriodicBenefitCost



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value28292929302930415455545458120
Percentage of DefinedBenefitPensionPlansNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Range

arnc:FundingOfCustomerReceivablesSold

srt:Maximum



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value00040000
Percentage of FundingOfCustomerReceivablesSold0.00.00.0100.00.00.0

us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

arnc:GainLossOnDispositionOfAssetsNetOfTax

arnc:TexarkanaTexasRollingMill



Period End2019-12-312018-12-31
Value15119
Percentage of GainLossOnDispositionOfAssetsNetOfTax100.0100.0

arnc:IncreaseDecreaseInSharebasedCompensation



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1617171071414158112028
Percentage of IncreaseDecreaseInSharebasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:StatementBusinessSegments

arnc:NumberOfEmployees

arnc:AluminumRollingMill, arnc:GlobalRolledProducts



Period End2019-12-01
Value540.0
Percentage of NumberOfEmployees100.0

us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:StatementBusinessSegments, us-gaap:SubsequentEventType

arnc:AluminumRollingMill, arnc:GlobalRolledProducts, us-gaap:SubsequentEvent



Period End2020-02-01
Value513.0
Percentage of NumberOfEmployees0.0

arnc:RestructuringAndOtherCharges



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-1011949912-11-2157-283192673
Percentage of RestructuringAndOtherCharges100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arnc:RestructuringAndOtherChargesAfterTax



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-03-31
Value-911439710-5-312511
Percentage of RestructuringAndOtherChargesAfterTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestructuringCostAndReserve

arnc:EliminationOfLifeInsuranceBenefits



Period End2019-12-312019-09-302019-06-302019-03-31
Value000-45
Percentage of RestructuringAndOtherChargesAfterTax-0.00.00.0-450.0

arnc:ImpairmentForTradeNameIntangibleAssetAndFixedAssets



Period End2019-12-312019-09-302019-06-30
Value1612
Percentage of RestructuringAndOtherChargesAfterTax-11.15.33.0

arnc:ImpairmentOfDisks



Period End2019-12-312019-09-302019-06-30
Value00345
Percentage of RestructuringAndOtherChargesAfterTax-0.00.086.9

arnc:OtherExitCosts



Period End2019-12-312019-09-302019-06-302018-06-302018-03-312017-03-31
Value12096-313
Percentage of RestructuringAndOtherChargesAfterTax-133.30.02.350.0-60.00.0

arnc:PensionSettlementCost



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1312723
Percentage of RestructuringAndOtherChargesAfterTax-11.12.60.320.0-1440.0-100.0

arnc:RestructuringProgramsLayoffs



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value4122515633819
Percentage of RestructuringAndOtherChargesAfterTax-44.40.95.5510.0-100.0-200.025.060.00.00.0

us-gaap:EmployeeSeverance



Period End2019-12-312019-09-302019-06-302018-09-302018-06-30
Value-5-1-3-1-4
Percentage of RestructuringAndOtherChargesAfterTax55.6-0.9-0.833.3-33.3

arnc:RestructuringReservePeriodExpenses



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value011950011103-719911112320-9
Percentage of RestructuringReservePeriodExpenses0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestructuringCostAndReserve

arnc:OtherExitCosts



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-31
Value-1111347200850-25
Percentage of RestructuringReservePeriodExpenses0.095.094.40.00.0-114.326.30.0277.8

us-gaap:EmployeeSeverance



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value1162811103-151491011232016
Percentage of RestructuringReservePeriodExpenses0.05.05.6100.0100.0214.373.7100.090.9100.0100.0100.0-177.8

us-gaap:ConsolidationItems

arnc:SegmentReportingInformationCorporateExpenses

us-gaap:MaterialReconcilingItems



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value98791206148469360504291919777115765372
Percentage of SegmentReportingInformationCorporateExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arnc:SegmentReportingInformationDepreciationAndAmortizationExpense



Period End2019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value121122129131133135135135133129126127127124126
Percentage of SegmentReportingInformationDepreciationAndAmortizationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

arnc:GlobalRolledProducts



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value58575454995053515252515049525050
Percentage of SegmentReportingInformationDepreciationAndAmortizationExpense47.946.741.941.20.037.639.337.838.539.139.539.738.640.940.339.7

arnc:SegmentReportingInformationProfitsLosses



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value504524538447360389432400504535556549-43395568524-647410
Percentage of SegmentReportingInformationProfitsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

arnc:GlobalRolledProducts



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value1501611451071727412311212414016417175581631553362
Percentage of SegmentReportingInformationProfitsLosses29.830.727.023.947.819.028.528.024.626.229.531.1-174.414.728.729.6-5.115.1

arnc:SegmentReportingInformationRestructuringAndOtherCharges



Period End2019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-151074692917100143166
Percentage of SegmentReportingInformationRestructuringAndOtherCharges100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:StatementBusinessSegments

arnc:GlobalRolledProducts



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-186226-15921-121757
Percentage of SegmentReportingInformationRestructuringAndOtherCharges120.057.90.420.70.011.810.00.014.354.886.4

arnc:SeparationTransactionCostsBeforeTax



Period End2019-12-31
Value34
Percentage of SeparationTransactionCostsBeforeTax100.0

arnc:SeparationTransactionCostsNetOfTax



Period End2019-12-31
Value28
Percentage of SeparationTransactionCostsNetOfTax100.0

us-gaap:ConsolidatedEntities

arnc:WeightedAverageInterestRateOutstandingBorrowings

srt:ParentCompany



Period End2019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value-0.00100000000000000090.0370.0390.00.0350.033
Percentage of WeightedAverageInterestRateOutstandingBorrowings100.0100.0100.00.0100.0100.0

us-gaap:AccrualForEnvironmentalLossContingenciesPayments1



Period End2019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-09-302016-06-30
Value272213177591052414
Percentage of AccrualForEnvironmentalLossContingenciesPayments1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-312008-12-312008-09-30
Value1616178714141581120281318292614232926162224251213232313152019252223202525181626915
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-312008-12-312008-09-30
Value1616178714141581120281318292614232926162224251213232313152019252223202525181626915
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

arnc:ConvertibleNotes



Period End2019-10-152019-09-302019-06-302018-09-302018-06-302018-03-312017-03-312016-03-31
Value1501400000
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.00.0100.00.00.00.00.0100.0

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities, us-gaap:SubsequentEventType

arnc:ConvertibleNotes, us-gaap:SubsequentEvent



Period End2019-10-15
Value15
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0

us-gaap:CommonStockDividendsPerShareCashPaid



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-302009-03-312008-09-302008-06-30
Value0.020.020.020.060.060.060.060.060.060.060.060.060.090.090.030.030.090.030.030.030.090.030.030.030.030.030.030.030.030.030.030.030.030.030.030.030.030.030.170.170.17
Percentage of CommonStockDividendsPerShareCashPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockDividendsPerShareDeclared



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-30
Value0.00.040.080.080.00.060.060.120.060.120.00.120.060.180.00.060.030.060.030.030.030.030.030.030.030.060.030.030.030.060.030.030.030.060.030.030.030.030.030.00.060.00.20.00.34
Percentage of CommonStockDividendsPerShareDeclared0.0100.0100.0100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.00.0100.0

us-gaap:DeferredIncomeTaxesAndTaxCredits



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1742-868-64482918410-3720
Percentage of DeferredIncomeTaxesAndTaxCredits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-1-1-1-1-2-1-2-2-1-2-1-1-5-8-5
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-35-35-34-35-42-42-42-42-55-55-55-55-72-104-102
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses3500.03500.03400.03500.02100.04200.02100.02100.05500.02750.05500.05500.01440.01300.02040.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-2-1-2-1-1-2-2-2-2-2-2-2-5-6-7
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value101001111121144
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit-50.0-0.0-50.0-0.0-0.0-50.0-50.0-50.0-50.0-50.0-100.0-50.0-20.0-66.7-57.1

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value727171727676777784828383119187186
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value777777778778101619
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value58595959555455555959585877114122
Percentage of DefinedBenefitPlanInterestCost828.6842.9842.9842.9785.7771.4785.7785.7737.5842.9828.6725.0770.0712.5642.1

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value888-499-20998989132121
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value2933313113134384654555454639185
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost362.5412.5387.5-63.31455.6-170.0422.2511.1675.0611.1675.0600.0484.6433.3404.8

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value00058-9280000
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments0.00.00.0100.0100.0100.00.00.00.00.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0000-90-9-50000
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments0.00.00.00.0100.00.00.00.00.00.00.00.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302016-12-312016-09-302016-06-30
Value-1-4-2-2-92-4000-4-13-2
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value212212221222334
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value66679982023222223414341
Percentage of DefinedBenefitPlanServiceCost300.0600.0300.0350.0900.0450.0400.01000.02300.01100.01100.01150.01366.71433.31025.0

us-gaap:DepreciationAndAmortization



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302009-06-302008-06-30
Value129131139137149141144142141140137133133136133317317
Percentage of DepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-312008-12-312008-09-30
Value1170380302958253054080079179383636363632065333206433326532323031310591680274
Percentage of DividendsCommonStockCash100.0100.00.0100.00.0100.0100.0100.0100.0100.00.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-12-312009-09-302009-03-312008-12-312008-09-30
Value1170380302958253054080079179383636363632065333206433326532323031310591680274
Percentage of DividendsCommonStockCash100.0100.00.0100.00.0100.0100.0100.0100.0100.00.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0

us-gaap:StatementClassOfStock

us-gaap:DividendsPreferredStockCash

us-gaap:PreferredClassA



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value0.01000000.00.01000000.00.01000000.00.01000000.00.01000000.00.01000000.00.01000000.00.01000000.00.01000000.00.01000000.01000000.0
Percentage of DividendsPreferredStockCash0.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.0100.0

us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:PreferredClassA, us-gaap:RetainedEarnings



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value0.01000000.00.01000000.00.01000000.00.01000000.00.01000000.00.01000000.00.01000000.00.01000000.00.01000000.00.01000000.01000000.0
Percentage of DividendsPreferredStockCash0.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value2-3010-2-643204
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.00.0100.00.0100.0100.0100.0100.0100.00.0100.0

us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:GainLossOnDispositionOfAssets1

arnc:TexarkanaTexasRollingMill



Period End2019-12-31
Value20
Percentage of GainLossOnDispositionOfAssets1100.0

us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:GainLossOnSaleOfBusiness

arnc:TexarkanaTexasRollingMillAndCastHouse



Period End2019-12-312018-10-312018-12-31
Value20154154
Percentage of GainLossOnSaleOfBusiness100.0100.0100.0

us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:StatementBusinessSegments

arnc:ForgingsBusiness, arnc:EngineeredProductsAndForgings



Period End2019-12-01
Value-46
Percentage of GainLossOnSaleOfBusiness0.0

us-gaap:Range, us-gaap:StatementScenario, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:StatementBusinessSegments

srt:Maximum, srt:ScenarioForecast, arnc:AlloyExtrusions, arnc:GlobalRolledProducts



Period End2020-03-31
Value25
Percentage of GainLossOnSaleOfBusiness0.0

srt:Minimum, srt:ScenarioForecast, arnc:AlloyExtrusions, arnc:GlobalRolledProducts



Period End2020-03-31
Value20
Percentage of GainLossOnSaleOfBusiness0.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302009-06-302008-06-30
Value304209-195257226249194199-455172269484-29033333041-721206282481234330207-274-199875-127234400-208-613828051750560-425855
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value304209-195257226249194199-455172269484-45122176
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.015.536.653.3

us-gaap:IncreaseDecreaseInAccountsPayableTrade



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-30
Value63-90-9465823920414156-2553-1224284729-272150-11053-18317357156-130150-12311918097-763113-55104-46-216-474-55-134
Percentage of IncreaseDecreaseInAccountsPayableTrade100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedLiabilities



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-30
Value48-4423-69-94-1234-11822-337-11223-11642-343-13-50-20-3545-10732-381-23-4219-372-1-7-236-267-326329-15023-30386-155
Percentage of IncreaseDecreaseInAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedTaxesPayable



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-31
Value-9451-6474126298-1672310111306-764-1105379358168-120-830-2161-602241133
Percentage of IncreaseDecreaseInAccruedTaxesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherNoncurrentAssets



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-08-312015-09-302015-06-302015-04-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-5741-13295-14-232634-132692021322-60-4326-602647-30196
Percentage of IncreaseDecreaseInOtherNoncurrentAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherNoncurrentLiabilities



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value-9-2711-2058-40-16-26-131-23-14-25-100-33-62-53-20-114-39-546248-13-50185
Percentage of IncreaseDecreaseInOtherNoncurrentLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-30
Value131-3214-211-2012-524-10-206614-73-15-24-2720-31526-132521-12-254431-571-14-3220-103-1123-50
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-30
Value20214254489122311306403-154-4-1729912879139-309-10354146-353440-30255-206-2854321-278-41139404176-213-35-126-302-397-45
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToConversionOfDebtSecurities



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312010-06-30
Value11150140141414-1414141499000000000898989898989
Percentage of IncrementalCommonSharesAttributableToConversionOfDebtSecurities100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-12-312014-09-302014-06-302013-09-302013-06-302013-03-312012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value25040552-5555-4511-12121101210908543311
Percentage of IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-09-302013-06-302013-03-312012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value01000005-2121-112-4146186-1-13479956
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements0.0100.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestOnConvertibleDebtNetOfTax



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value93043333-722222000000000
Percentage of InterestOnConvertibleDebtNetOfTax100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingLeaseCost



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3536373735353638
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value-110301-20-11-101-33133031-3-2-22-2-1101-31-2202-21
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.0100.00.0100.00.0100.0100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-647-6-672-8230-15137-470-717
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-40-138-11-79-61715-4
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax0.6-0.0216.711.113.4-23.3-60.0-4.4-3.6-214.3-23.5

us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-505-4-556-6623-12106-365-612
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-30-107-9-68-51510-3
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax0.6-0.0200.012.513.6-26.1-66.7-4.7-4.1-166.7-25.0

us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-142-2-116-167-331-105-15
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-10-31-2-11-125-1
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax0.7-0.0300.06.212.5-14.3-33.3-3.2-1.9-500.0-20.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-11-107-10-104-7
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value-401-59-1776-1512-170258-3151274470-270-60910362185-855656-1162-1011-893185447-2440-723112-614139-659286-972-1215674
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-477262340463729143-3303148
Percentage of OtherComprehensiveIncomeLossNetOfTax119.0-44.1-135.352.6-306.7308.3-17.155.4104.824.4109.1

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-11-107-10-104-71310-2
Percentage of OtherComprehensiveIncomeLossNetOfTax0.2-1.758.89.266.7-83.3-2.4-2.7-4.17.9-4.5

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-110301-20-11-101
Percentage of OtherComprehensiveIncomeLossNetOfTax0.2-1.7-0.03.9-0.08.31.20.00.30.8-229.5

us-gaap:AccumulatedTranslationAdjustment



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value78-87-3026-51-16-20112218599
Percentage of OtherComprehensiveIncomeLossNetOfTax-19.5147.5176.534.2340.0-133.3118.247.3-0.366.9225.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value477-26-23-40-46-37-29-143110314831-119-463-67-33228-1201-107296-122-15-77-274-12463-96696-52-79-58814-63-61
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoncashIncomeExpense



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312012-09-302012-03-312011-03-31
Value2-1-3-11-14-11-1-49-13-45-187-48-4-15-331-9731-241-44-143737-17196
Percentage of OtherNoncashIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-312011-03-312009-12-312009-09-302008-12-312008-09-30
Value1001011-11-1-5-240-10-3-12-2-12-1-10-6-16-1-8-3-11-10-6-43-2-4-13479
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForRestructuring



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value1422261711810201915922-7936527714272557628435323118
Percentage of PaymentsForRestructuring100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestructuringCostAndReserve

arnc:OtherExitCosts



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value110311001014-20
Percentage of PaymentsForRestructuring7.14.50.017.69.112.50.00.05.30.011.118.225.3

arnc:RestructuringProgramsLayoffsTwoThousandNineteen



Period End2019-12-312019-09-302019-06-302019-03-31
Value421267
Percentage of PaymentsForRestructuring28.695.5100.041.2

us-gaap:EmployeeSeverance



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value1321261410710201815818-5925406711242254557532292816
Percentage of PaymentsForRestructuring92.995.5100.082.490.987.5100.0100.094.7100.088.981.874.769.476.987.078.688.988.094.788.789.391.490.690.388.9

us-gaap:PaymentsOfDebtExtinguishmentCosts



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value00000001700520
Percentage of PaymentsOfDebtExtinguishmentCosts0.00.00.00.00.00.00.0100.00.00.0100.00.0

us-gaap:PaymentsOfOrdinaryDividends



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value99102930293030304443455757575774
Percentage of PaymentsOfOrdinaryDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionContributions



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-30
Value51778555925160177539411053638077701071948485551641919110817398834616313921331222633353438418
Percentage of PensionContributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PreferredStockDividendsAndOtherAdjustments



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value010101010181817171817181718171720001
Percentage of PreferredStockDividendsAndOtherAdjustments0.0100.00.0100.00.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0

us-gaap:StatementClassOfStock

us-gaap:PreferredStockDividendsPerShareDeclared

us-gaap:PreferredClassA



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value0.93750.93750.93750.93750.93750.93750.93750.93750.01.8750.93750.93750.01.8750.93750.93750.01.8750.93750.93750.93750.9375
Percentage of PreferredStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value-12-1-130-2-6-11-20-1-14-12
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.00.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value20-11-10-205-176183-1-72-10-2-3026
Percentage of ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess100.00.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfFinanceReceivables



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312012-03-30
Value3652132571603232732841362782291909550
Percentage of ProceedsFromSaleOfFinanceReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromStockOptionsExercised



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312012-09-302012-03-312011-03-312010-03-312009-12-312009-09-302008-12-312008-09-30
Value3781011211222242211-10224223126711200282850001
Percentage of ProceedsFromStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.00.00.00.0100.0

us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-36-39-3621-144-18-52-48-55-56-56
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-3-210254330-1
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax8.35.1-2.80.0-1.4-27.8-7.7-6.2-5.5-0.01.8

us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-28-30-2816-112-14-41-37-35-37-36
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-2-100144220-1
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax7.13.3-0.00.0-0.9-28.6-9.8-5.4-5.7-0.02.8

us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-8-9-85-32-4-11-11-20-19-20
Percentage of ReclassificationFromAociCurrentPeriodTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-1000000.0-1000000.01000000.00.01000000.01000000.00.01000000.01000000.00.00.0
Percentage of ReclassificationFromAociCurrentPeriodTax12.511.1-12.50.0-3.1-25.0-0.0-9.1-5.0-0.0-0.0

us-gaap:RestructuringCostAndReserve

us-gaap:RestructuringAndRelatedCostNumberOfPositionsEliminated

arnc:RestructuringProgramsLayoffs



Period End2019-12-312019-09-302019-06-302019-03-312018-09-30
Value127.056.0350.0800.085.0
Percentage of RestructuringAndRelatedCostNumberOfPositionsEliminated100.0100.0100.0100.0100.0

arnc:RestructuringProgramsLayoffsTwoThousandNineteen



Period End2019-12-312019-09-30
Value127.056.0
Percentage of RestructuringAndRelatedCostNumberOfPositionsEliminated100.0100.0

us-gaap:RestructuringCostAndReserve, us-gaap:StatementBusinessSegments

arnc:RestructuringProgramsLayoffs, arnc:EngineeredProductsAndSolutions



Period End2019-12-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value16.049.0125.0168.065.024.0
Percentage of RestructuringAndRelatedCostNumberOfPositionsEliminated12.687.535.721.076.50.0

arnc:RestructuringProgramsLayoffs, arnc:GlobalRolledProducts



Period End2019-12-312019-09-302019-06-302019-03-31
Value114.0259.025.086.0
Percentage of RestructuringAndRelatedCostNumberOfPositionsEliminated89.8462.57.110.8

arnc:RestructuringProgramsLayoffs, us-gaap:Corporate



Period End2019-12-312019-09-302019-06-302019-03-312018-09-30
Value-3.00.069.0425.020.0
Percentage of RestructuringAndRelatedCostNumberOfPositionsEliminated-2.40.019.753.123.5

us-gaap:RestructuringCharges



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-30
Value-1011949912-11-215747192673211823937356621717738820911046138015124476021510934623018769178269863380
Percentage of RestructuringCharges100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-1011949912-11-215747192673122314
Percentage of RestructuringCharges100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0581.016.760.9

us-gaap:IncomeStatementLocation, us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan

us-gaap:SellingGeneralAndAdministrativeExpenses, us-gaap:OtherRestructuring, arnc:ProposedSeparationTransaction



Period End2019-12-312019-09-302019-06-302019-03-31
Value3425163
Percentage of RestructuringCharges-340.021.03.225.0

us-gaap:RestructuringCostAndReserve

arnc:EliminationOfLifeInsuranceBenefits



Period End2019-12-312019-09-302019-06-302019-03-31
Value000-58
Percentage of RestructuringCharges-0.00.00.0-483.3

arnc:ExecutiveSeveranceNetOfTheBenefitOfForfeitedExecutiveStockCompensation



Period End2019-12-312019-09-302019-06-302019-03-31
Value0002
Percentage of RestructuringCharges-0.00.00.016.7

arnc:ImpairmentForTradeNameIntangibleAssetAndFixedAssets



Period End2019-12-312019-09-302019-06-30
Value1816
Percentage of RestructuringCharges-10.06.73.2

arnc:ImpairmentOfDisks



Period End2019-12-312019-09-302019-06-30
Value00428
Percentage of RestructuringCharges-0.00.085.8

arnc:OtherExitCosts



Period End2019-12-312019-09-302019-06-302018-06-302018-03-312017-03-31
Value140128-419
Percentage of RestructuringCharges-140.00.02.453.3-57.126.0

arnc:OtherExitCostsOtherAcceleratedDepreciation



Period End2019-12-312019-09-30
Value34
Percentage of RestructuringCharges-30.03.4

arnc:OtherExitCostsReclassificationOfLeaseExitCosts



Period End2019-12-312019-09-302019-06-302019-03-31
Value000-9
Percentage of RestructuringCharges-0.00.00.0-75.0

arnc:OtherMiscellaneousCharges



Period End2019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-30
Value00013225845-58742
Percentage of RestructuringCharges-0.00.00.08.3-150.013.328.610.642.115.46.8-23.844.430.40.53.0

arnc:OtherPensionSettlementCost



Period End2019-12-312019-09-30
Value14
Percentage of RestructuringCharges-10.03.4

arnc:PensionSettlementCost



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1422964
Percentage of RestructuringCharges-10.03.40.416.7-872.7-200.0

arnc:RestructuringAcceleratedDepreciation



Period End2019-12-312019-09-302019-06-30
Value342
Percentage of RestructuringCharges-30.03.40.4

arnc:RestructuringProgramsLayoffs



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value62306548441129
Percentage of RestructuringCharges-60.01.76.0541.7-36.4-400.026.757.157.9111.5

us-gaap:EmployeeSeverance



Period End2019-12-312019-09-302019-06-302018-09-302018-06-302015-12-312015-09-302014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-06-302011-03-312010-09-302010-06-30
Value-6-1-3-1-594333314136010724327361185328
Percentage of RestructuringCharges60.0-0.8-0.650.0-33.312.850.08.50.53.62.815.870.99.842.945.0150.040.0110.023.583.3150.093.3

us-gaap:RestructuringCostAndReserve, us-gaap:SubsequentEventType

arnc:GRPOperationsCurtailmentBenefit, us-gaap:SubsequentEvent



Period End2019-10-18
Value4
Percentage of RestructuringCharges0.0

us-gaap:RestructuringReserveAccrualAdjustment1



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value-1083118471-48-108-2332-9100-123-14
Percentage of RestructuringReserveAccrualAdjustment1100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:RestructuringCostAndReserve

arnc:OtherExitCosts



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value-117211247092000100111
Percentage of RestructuringReserveAccrualAdjustment1108.294.999.8-18.8-1.9-0.00.0-0.010.00.0-0.033.3-78.6

us-gaap:EmployeeSeverance



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value8961-57-110-2332-990-122-25
Percentage of RestructuringReserveAccrualAdjustment1-8.25.10.2118.8101.9100.0100.0100.090.00.0100.066.7178.6

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-30
Value38610-132111-422-7104-42-21151152236275191-3-10-143-3368-11-20101-1-5-13-13158
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-30
Value36510-15211-1021-774-12-8-189-41-6-186-65-110-93-316-39-1-7-75-2-4-5-57-2-8-165-17-34-671-5-5-67-1012
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation94.783.3100.0115.4100.0100.0100.0-100.0-0.095.5100.070.0100.0300.0-400.0900.0-400.020.0-600.0-1240.0-295.5-305.6-344.4-619.6-433.3-100.0233.3750.0200.0-100.0-166.71900.0-66.7-133.3-2062.5154.5170.0-670.0100.0500.0100.0515.4100.00.07.6

us-gaap:CommonStock



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value21020002103
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation5.316.70.0-15.40.00.00.0200.04.5-0.030.0

us-gaap:StockRepurchasedDuringPeriodValue



Period End2019-12-312019-09-302019-06-302019-03-31
Value50200200700
Percentage of StockRepurchasedDuringPeriodValue100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2019-12-312019-09-302019-06-302019-03-31
Value47193187668
Percentage of StockRepurchasedDuringPeriodValue94.096.593.595.4

us-gaap:CommonStock



Period End2019-12-312019-09-302019-06-302019-03-31
Value371332
Percentage of StockRepurchasedDuringPeriodValue6.03.56.54.6

us-gaap:StockholdersEquityOther



Period End2019-12-312019-09-302019-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-06-302012-03-312011-06-302011-03-312010-06-302010-03-312009-12-312009-09-302009-03-312008-09-30
Value0-4110-7-911-14010-1120-4110-111-11-121190-57-6
Percentage of StockholdersEquityOther0.0100.0100.0100.00.0100.0100.0100.0100.00.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2019-12-312019-09-302010-03-31
Value0-220
Percentage of StockholdersEquityOther0.050.0105.3

us-gaap:NoncontrollingInterest



Period End2019-12-312019-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-06-302012-03-312011-06-302011-03-312010-06-302010-03-312009-12-312009-09-302009-03-312008-09-30
Value0-2100-111-14010-1120-4110-111-11-121-10-67-6
Percentage of StockholdersEquityOther0.050.0100.00.0-0.011.1100.0100.00.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0-5.30.0120.0100.0100.0

us-gaap:ShareRepurchaseProgram

us-gaap:TreasuryStockAcquiredAverageCostPerShare

arnc:AcceleratedShareRepurchaseProgram



Period End2019-12-312019-09-30
Value0.299999999999997160.870000000000001
Percentage of TreasuryStockAcquiredAverageCostPerShare100.0100.0

arnc:August2019ASR



Period End2019-12-31
Value0.0
Percentage of TreasuryStockAcquiredAverageCostPerShare0.0

us-gaap:ShareRepurchaseProgram

us-gaap:TreasuryStockSharesAcquired

arnc:AcceleratedShareRepurchaseProgram



Period End2019-12-312019-09-302019-02-21
Value1731
Percentage of TreasuryStockSharesAcquired100.0100.0100.0

arnc:August2019ASR



Period End2019-10-032019-12-312019-08-08
Value006
Percentage of TreasuryStockSharesAcquired0.00.00.0

arnc:February2019ASR



Period End2019-12-312019-09-302019-04-292019-02-21
Value00431
Percentage of TreasuryStockSharesAcquired0.00.00.0100.0

arnc:May2019ASR



Period End2019-12-312019-09-302019-06-122019-05-06
Value0017
Percentage of TreasuryStockSharesAcquired0.00.00.00.0

arnc:ShareRepurchasesProgramNovember2019



Period End2019-11-212019-11-202019-11-192019-11-18
Value400681.0370000.0428000.0428000.0
Percentage of TreasuryStockSharesAcquired0.00.00.00.0

us-gaap:ShareRepurchaseProgram, us-gaap:SubsequentEventType

arnc:August2019ASR, us-gaap:SubsequentEvent



Period End2019-10-03
Value983107.0
Percentage of TreasuryStockSharesAcquired0.0

arnc:AccountsPayableSettlementArrangements



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value2929333132
Percentage of AccountsPayableSettlementArrangements100.0100.0100.0100.0100.0

arnc:AmountCommittedUnderOutstandingSuretyBonds



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value504950505049495554128127121120
Percentage of AmountCommittedUnderOutstandingSuretyBonds100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

arnc:DeferredTaxAssetsDepreciation



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value253831158
Percentage of DeferredTaxAssetsDepreciation100.0100.0100.0100.0100.0

arnc:DeferredTaxLiabilitiesDepreciation



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value729694693817964
Percentage of DeferredTaxLiabilitiesDepreciation100.0100.0100.0100.0100.0

arnc:DeferredTaxLiabilitiesEmployeeBenefits



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value162723811
Percentage of DeferredTaxLiabilitiesEmployeeBenefits100.0100.0100.0100.0100.0

arnc:DeferredTaxLiabilitiesGross



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value1704184319079191008
Percentage of DeferredTaxLiabilitiesGross100.0100.0100.0100.0100.0

arnc:DeferredTaxLiabilitiesLossProvisions



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value001412
Percentage of DeferredTaxLiabilitiesLossProvisions0.00.0100.0100.0100.0

us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanType

arnc:DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAsset

arnc:DiscretionaryAndSystematicMacroHedgeFunds, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value405471
Percentage of DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAsset100.0100.0

arnc:EquitiesEquitySecurities, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value508578
Percentage of DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAsset125.4122.7

arnc:FixedIncomeOther, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value144152
Percentage of DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAsset35.632.3

arnc:IntermediateAndLongDurationGovernmentCredit, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value1003770
Percentage of DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAsset247.7163.5

arnc:OtherInvestmentsOther, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value240212
Percentage of DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAsset59.345.0

us-gaap:EquitySecurities, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value923957978
Percentage of DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAsset227.9203.20.0

us-gaap:FixedIncomeSecurities, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value1147922924
Percentage of DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAsset283.2195.80.0

us-gaap:HedgeFundsEquityLongShort, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value260232
Percentage of DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAsset64.249.3

us-gaap:OtherInvestments, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value8108471030
Percentage of DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAsset200.0179.80.0

us-gaap:PrivateEquityFunds, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value155147
Percentage of DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAsset38.331.2

us-gaap:RealEstateFunds, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value165164
Percentage of DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAsset40.734.8

us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value288027262932
Percentage of DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAsset711.1578.80.0

us-gaap:RetirementPlanType

arnc:DefinedBenefitPlanExpectedFutureBenefitPayments

arnc:GrossPostretirementDefinedBenefitPlan



Period End2019-12-312018-12-312017-12-31
Value655730785
Percentage of DefinedBenefitPlanExpectedFutureBenefitPayments100.0100.0100.0

arnc:NetOtherPostRetirementBenefits



Period End2019-12-312018-12-312017-12-31
Value605680735
Percentage of DefinedBenefitPlanExpectedFutureBenefitPayments92.493.293.6

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Period End2019-12-312018-12-312017-12-31
Value442044504475
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Period End2019-12-312018-12-312017-12-312016-12-31
Value14260109105
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Period End2019-12-312018-12-312017-12-312016-12-31
Value3376296032502994
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Period End2019-12-312018-12-312017-12-312016-12-31
Value-786-806-927-980
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Period End2019-12-312018-12-312017-12-312016-12-31
Value-2381-2142-2497-2360
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Period End2019-12-312018-12-31
Value48754333
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Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-07-312018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value172166173171174175130130129248247246244
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Period End2019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-312015-12-31
Value47324636475049504965497347164604
Percentage of PropertiesPlantsAndEquipmentExcludingConstructionWorkInProgress100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2019-12-31
Value5714
Percentage of PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization100.0

us-gaap:StatementGeographical

arnc:OtherGeographicalRegions



Period End2019-12-31
Value69
Percentage of PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization1.2

country:BR



Period End2019-12-31
Value5
Percentage of PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization0.1

country:CA



Period End2019-12-31
Value57
Percentage of PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization1.0

country:CN



Period End2019-12-31
Value338
Percentage of PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization5.9

country:DE



Period End2019-12-31
Value86
Percentage of PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization1.5

country:FR



Period End2019-12-31
Value185
Percentage of PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization3.2

country:GB



Period End2019-12-31
Value189
Percentage of PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization3.3

country:HU



Period End2019-12-31
Value302
Percentage of PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization5.3

country:MX



Period End2019-12-31
Value57
Percentage of PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization1.0

country:RU



Period End2019-12-31
Value233
Percentage of PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization4.1

country:US



Period End2019-12-31
Value4193
Percentage of PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization73.4

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Period End2019-12-312018-12-312017-12-31
Value312938
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Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-31
Value230253275261266280287292294292301308308602606605604558574538543563571565509515535524532535365344347327332332333330307
Percentage of AccrualForEnvironmentalLossContingencies100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value171191210195198208211213215221224227228230234
Percentage of AccrualForEnvironmentalLossContingencies74.375.576.474.774.474.373.572.973.175.774.473.774.038.238.7

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Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-31
Value948895798170514041394252485449475063536670667673485169687463675658342629312227
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Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value73197314748476448319831082958280826682948262824982148197987798561001999549147912492848760763577047509753675247508756075497538752375617545752275087087709471006608661266015850
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Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value33313432342428
Percentage of AllowanceForDoubtfulAccountsReceivable100.0100.0100.0100.0100.0100.0100.0

arnc:ReceivablesFromCustomers



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value34813868
Percentage of AllowanceForDoubtfulAccountsReceivable9.112.923.540.623.525.028.6

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Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302009-06-302008-12-31
Value344445588781213141413131213131420212120212235394442454639414545576170747265
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2019-12-312019-09-302019-06-302019-03-312018-12-31
Value254545455
Percentage of BusinessCombinationContingentConsiderationAsset100.0100.0100.0100.0100.0

us-gaap:ConstructionInProgressGross



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value7317417677777396217831305146615671754170921922447
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Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value00000000224
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arnc:SecondLienNotesDue2028, us-gaap:SubsequentEvent



Period End2020-02-07
Value600
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us-gaap:DebtInstrumentRepurchaseAmount

arnc:OnePointSixThreePercentConvertibleNotesDueTwoThousandNineteen



Period End2019-10-15
Value403
Percentage of DebtInstrumentRepurchaseAmount100.0

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Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value751779805817739730713744759876875869870262526522639273825802743278528492971
Percentage of DeferredCreditsAndOtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxAssetsNet



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value6084665684805736056266757431234
Percentage of DeferredIncomeTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2019-12-312018-12-31
Value560
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Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value9622192037308753458817
Percentage of DeferredTaxAssetsDeferredIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsGross



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value45194822508739546524625763886402604852345165
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value29323159330515401917207522292186203517341677
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOther



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value529424184680521310324315424242
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Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value379579638652693625567508477483465
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Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value1208108411441762391435573592
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Period End2019-12-312018-12-312017-12-312016-12-31
Value120648472
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arnc:OtherDeferredTaxAssets



Period End2019-12-312018-12-312017-12-312016-12-31
Value1088102010601690
Percentage of DeferredTaxAssetsTaxCreditCarryforwardsOther90.194.192.795.9

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Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value88783693613822517241324992742266820212376
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value9294134181486441437368325335174
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesDeferredExpense



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value9431102114474294230188203181140133
Percentage of DeferredTaxLiabilitiesDeferredExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value16203393339297261297288224181
Percentage of DeferredTaxLiabilitiesOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302008-12-31
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Period End2019-12-312018-12-312017-12-312016-12-31
Value7219644471696850
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation100.0100.0100.0100.0

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Period End2019-12-312018-12-312017-12-312016-12-31
Value-179-87-146-150
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax100.0100.0100.0100.0

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Period End2019-12-312018-12-312017-12-312016-12-31
Value-3375-2957-3240-2979
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Period End2019-12-312018-12-312017-12-312016-12-31
Value-37-27-37-45
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax100.0100.0100.0100.0

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Period End2019-12-312018-12-312017-12-312016-12-31
Value131015
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Period End2019-12-312018-12-312017-12-312016-12-31
Value-786-806-927-980
Percentage of DefinedBenefitPlanAmountsRecognizedInBalanceSheet100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value-2381-2142-2497-2360
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us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value104111896
Percentage of DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent100.0100.0100.0100.0

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Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value0.0330.04350.03750.0420.04290.040.0480.04150.0490.05750.0615
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Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value0.00.0350.0350.0350.0350.0350.0350.0350.0350.0350.035
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Period End2019-12-312018-12-312017-12-312016-12-31
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Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value7868069279802319
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Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value724964767359702614247
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Period End2019-12-312018-12-312017-12-31
Value-176-139-168
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us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value023
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arnc:GrossPostretirementDefinedBenefitPlan



Period End2019-12-312018-12-312017-12-31
Value260300335
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter100.0100.0100.0

arnc:NetOtherPostRetirementBenefits



Period End2019-12-312018-12-312017-12-31
Value235275310
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter90.491.792.5

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value212021702265
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter815.4723.3676.1

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

arnc:GrossPostretirementDefinedBenefitPlan



Period End2019-12-312018-12-312017-12-31
Value809090
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths100.0100.0100.0

arnc:NetOtherPostRetirementBenefits



Period End2019-12-312018-12-312017-12-31
Value758585
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths93.894.494.4

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value470460435
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths587.5511.1483.3

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

arnc:GrossPostretirementDefinedBenefitPlan



Period End2019-12-312018-12-312017-12-31
Value758590
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive100.0100.0100.0

arnc:NetOtherPostRetirementBenefits



Period End2019-12-312018-12-312017-12-31
Value708085
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive93.394.194.4

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

arnc:GrossPostretirementDefinedBenefitPlan



Period End2019-12-312018-12-312017-12-31
Value808590
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour100.0100.0100.0

arnc:NetOtherPostRetirementBenefits



Period End2019-12-312018-12-312017-12-31
Value758085
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour93.894.194.4

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value455455445
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour568.8535.3494.4

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

arnc:GrossPostretirementDefinedBenefitPlan



Period End2019-12-312018-12-312017-12-31
Value808590
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree100.0100.0100.0

arnc:NetOtherPostRetirementBenefits



Period End2019-12-312018-12-312017-12-31
Value758085
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree93.894.194.4

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value460455440
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree575.0535.3488.9

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

arnc:GrossPostretirementDefinedBenefitPlan



Period End2019-12-312018-12-312017-12-31
Value808590
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo100.0100.0100.0

arnc:NetOtherPostRetirementBenefits



Period End2019-12-312018-12-312017-12-31
Value758085
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo93.894.194.4

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value465460440
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo581.2541.2488.9

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear



Period End2019-12-312018-12-31
Value475255
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear100.0100.0

us-gaap:RetirementPlanSponsorLocation

country:US



Period End2019-12-312018-12-31
Value403230
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear84.890.2

us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets

arnc:EquitiesEquitySecurities, us-gaap:FairValueInputsLevel1, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value590318
Percentage of DefinedBenefitPlanFairValueOfPlanAssets100.0100.0

arnc:FixedIncomeOther, us-gaap:FairValueInputsLevel1, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value1269
Percentage of DefinedBenefitPlanFairValueOfPlanAssets21.42.8

arnc:FixedIncomeOther, us-gaap:FairValueInputsLevel2, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value79
Percentage of DefinedBenefitPlanFairValueOfPlanAssets1.22.8

arnc:IntermediateAndLongDurationGovernmentCredit, us-gaap:FairValueInputsLevel1, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value121200
Percentage of DefinedBenefitPlanFairValueOfPlanAssets20.562.9

arnc:IntermediateAndLongDurationGovernmentCredit, us-gaap:FairValueInputsLevel2, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value1047934
Percentage of DefinedBenefitPlanFairValueOfPlanAssets177.5293.7

arnc:OtherInvestmentsOther, us-gaap:FairValueInputsLevel1, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value056
Percentage of DefinedBenefitPlanFairValueOfPlanAssets0.017.6

us-gaap:EquitySecurities, us-gaap:FairValueInputsLevel1, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value590318379
Percentage of DefinedBenefitPlanFairValueOfPlanAssets100.0100.00.0

us-gaap:FixedIncomeSecurities, us-gaap:FairValueInputsLevel1, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value247209365
Percentage of DefinedBenefitPlanFairValueOfPlanAssets41.965.70.0

us-gaap:FixedIncomeSecurities, us-gaap:FairValueInputsLevel2, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value1054943989
Percentage of DefinedBenefitPlanFairValueOfPlanAssets178.6296.50.0

us-gaap:OtherInvestments, us-gaap:FairValueInputsLevel1, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value104137162
Percentage of DefinedBenefitPlanFairValueOfPlanAssets17.643.10.0

us-gaap:OtherInvestments, us-gaap:FairValueInputsLevel2, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value007
Percentage of DefinedBenefitPlanFairValueOfPlanAssets0.00.00.0

us-gaap:RealEstateFunds, us-gaap:FairValueInputsLevel1, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value10481
Percentage of DefinedBenefitPlanFairValueOfPlanAssets17.625.5

us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanType

arnc:DiscretionaryAndSystematicMacroHedgeFunds, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value405471
Percentage of DefinedBenefitPlanFairValueOfPlanAssets68.6148.1

arnc:EquitiesEquitySecurities, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value1098896
Percentage of DefinedBenefitPlanFairValueOfPlanAssets186.1281.8

arnc:FixedIncomeOther, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value277170
Percentage of DefinedBenefitPlanFairValueOfPlanAssets46.953.5

arnc:IntermediateAndLongDurationGovernmentCredit, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value21711904
Percentage of DefinedBenefitPlanFairValueOfPlanAssets368.0598.7

arnc:OtherInvestmentsOther, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value240268
Percentage of DefinedBenefitPlanFairValueOfPlanAssets40.784.3

us-gaap:EquitySecurities, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value151312751357
Percentage of DefinedBenefitPlanFairValueOfPlanAssets256.4400.90.0

us-gaap:FixedIncomeSecurities, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value244820742278
Percentage of DefinedBenefitPlanFairValueOfPlanAssets414.9652.20.0

us-gaap:HedgeFundsEquityLongShort, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value260232
Percentage of DefinedBenefitPlanFairValueOfPlanAssets44.173.0

us-gaap:OtherInvestments, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value9149841199
Percentage of DefinedBenefitPlanFairValueOfPlanAssets154.9309.40.0

us-gaap:PrivateEquityFunds, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value155147
Percentage of DefinedBenefitPlanFairValueOfPlanAssets26.346.2

us-gaap:RealEstateFunds, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-31
Value269245
Percentage of DefinedBenefitPlanFairValueOfPlanAssets45.677.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:RetirementPlanType

us-gaap:FairValueInputsLevel1, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value941664906
Percentage of DefinedBenefitPlanFairValueOfPlanAssets159.5208.80.0

us-gaap:FairValueInputsLevel2, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value1054943996
Percentage of DefinedBenefitPlanFairValueOfPlanAssets178.6296.50.0

us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

country:US, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value3513312335443495
Percentage of DefinedBenefitPlanFairValueOfPlanAssets595.4982.10.00.0

us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value486843344862466610928
Percentage of DefinedBenefitPlanFairValueOfPlanAssets825.11362.90.00.00.0

us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanFundedStatusOfPlan

country:US, us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value-2371-2159-2474-2212
Percentage of DefinedBenefitPlanFundedStatusOfPlan100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value357931824016
Percentage of DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value6045541564226104
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value3579317939983894
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-31
Value606454356600
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation100.0100.0100.0

us-gaap:Range

us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1

srt:Maximum



Period End2019-12-312018-12-31
Value0.007-0.005
Percentage of DefinedBenefitPlanUltimateHealthCareCostTrendRate1100.0100.0

srt:Minimum



Period End2019-12-312018-12-31
Value-0.038-0.033
Percentage of DefinedBenefitPlanUltimateHealthCareCostTrendRate1-542.9660.0

us-gaap:FinancialInstrument

us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations

us-gaap:EquitySecurities



Period End2019-12-312018-12-312017-12-31
Value0.310.290.28
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations100.0100.0100.0

us-gaap:FixedIncomeSecurities



Period End2019-12-312018-12-312017-12-31
Value0.50.480.47
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations161.3165.5167.9

us-gaap:OtherInvestments



Period End2019-12-312018-12-312017-12-31
Value0.190.230.25
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations61.379.389.3

us-gaap:ConsolidationItems

us-gaap:DerivativeAssets

us-gaap:MaterialReconcilingItems



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-31
Value61158372857539124107816
Percentage of DerivativeAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:StatementBusinessSegments

us-gaap:DisposalGroupIncludingDiscontinuedOperationConsideration

arnc:AlloyExtrusions, arnc:GlobalRolledProducts



Period End2019-10-30
Value61
Percentage of DisposalGroupIncludingDiscontinuedOperationConsideration100.0

arnc:ForgingsBusiness, arnc:EngineeredProductsAndForgings



Period End2019-12-012019-09-13
Value6462
Percentage of DisposalGroupIncludingDiscontinuedOperationConsideration0.00.0

us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:StatementBusinessSegments, us-gaap:SubsequentEventType

arnc:AlloyExtrusions, arnc:GlobalRolledProducts, us-gaap:SubsequentEvent



Period End2019-10-30
Value61
Percentage of DisposalGroupIncludingDiscontinuedOperationConsideration100.0

arnc:AluminumRollingMill, arnc:GlobalRolledProducts, us-gaap:SubsequentEvent



Period End2020-02-01
Value50
Percentage of DisposalGroupIncludingDiscontinuedOperationConsideration0.0

us-gaap:EmployeeRelatedLiabilitiesCurrent



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302008-12-31
Value4323923843393703593643333993793633283988308107798508258027779379519378791013101994993210581018942909985956915854929904799925885866
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value927913897806979908868780705-657-602
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsByMajorClass

arnc:PatentLicenseAgreement



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value9310710710298
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization10.011.711.912.710.0

us-gaap:ComputerSoftwareIntangibleAsset



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312011-12-312010-12-312009-12-31
Value659657674623801775743595-550-487
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization71.172.075.177.381.885.485.684.483.780.9

us-gaap:OtherIntangibleAssets



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value17514911681743532
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization18.916.312.910.07.63.93.7

us-gaap:Range

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srt:Maximum



Period End2019-12-312018-12-31
Value6070
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths100.0100.0

srt:Minimum



Period End2019-12-312018-12-31
Value5063
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths83.390.0

us-gaap:Range

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

srt:Maximum



Period End2019-12-312018-12-31
Value070
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour0.0100.0

srt:Minimum



Period End2019-12-312018-12-31
Value063
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour0.090.0

us-gaap:Range

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

srt:Maximum



Period End2019-12-312018-12-31
Value070
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree0.0100.0

srt:Minimum



Period End2019-12-312018-12-31
Value063
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree0.090.0

us-gaap:Range

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

srt:Maximum



Period End2019-12-312018-12-31
Value070
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo0.0100.0

srt:Minimum



Period End2019-12-312018-12-31
Value063
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo0.090.0

us-gaap:FiniteLivedIntangibleAssetsGross



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value15531800185217622092159912211141112211351170
Percentage of FiniteLivedIntangibleAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsByMajorClass

arnc:PatentLicenseAgreement



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value95110110110110
Percentage of FiniteLivedIntangibleAssetsGross6.16.15.96.25.3

us-gaap:ComputerSoftwareIntangibleAsset



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312011-12-312010-12-312009-12-31
Value744768789755969973988902919944
Percentage of FiniteLivedIntangibleAssetsGross47.942.742.642.846.360.980.980.481.080.7

us-gaap:OtherIntangibleAssets



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value714922953897988493100
Percentage of FiniteLivedIntangibleAssetsGross46.051.251.550.947.230.88.2

us-gaap:GoodwillGross



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value52405272530752017185700651745198527951505082
Percentage of GoodwillGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, arnc:EngineeredProductsAndForgings



Period End2019-12-312018-12-312017-12-31
Value478649054931
Percentage of GoodwillGross91.393.092.9

us-gaap:OperatingSegments, arnc:GlobalRolledProducts



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value454245193181201
Percentage of GoodwillGross8.74.63.63.52.8

us-gaap:StatementBusinessSegments

arnc:LatinAmericaExtrusionsLAE



Period End2019-12-31
Value25
Percentage of GoodwillGross0.5

us-gaap:GoodwillImpairedAccumulatedImpairmentLoss



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value7477727725317841759175928282828
Percentage of GoodwillImpairedAccumulatedImpairmentLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, arnc:GlobalRolledProducts



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value280000
Percentage of GoodwillImpairedAccumulatedImpairmentLoss3.70.00.00.00.0

us-gaap:BalanceSheetLocation, us-gaap:TypeOfArrangement

us-gaap:GuaranteeObligationsMaximumExposure

arnc:OtherNoncurrentLiabilitiesAndDeferredCredits, arnc:SeparationAgreement



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value135312651215114310871297
Percentage of GuaranteeObligationsMaximumExposure100.0100.0100.0100.0100.0100.0

us-gaap:TypeOfArrangement

us-gaap:GuaranteesFairValueDisclosure

arnc:SeparationAgreement



Period End2019-12-312018-12-312017-12-31
Value961297
Percentage of GuaranteesFairValueDisclosure100.0100.0100.0

us-gaap:Currency, us-gaap:StatementGeographical

us-gaap:IncomeTaxReceivable

currency:EUR, country:ES



Period End2019-12-31
Value26
Percentage of IncomeTaxReceivable100.0

us-gaap:StatementGeographical

country:ES



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value292829282925
Percentage of IncomeTaxReceivable111.50.00.00.00.00.0

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value3232323245464646773422
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPayableCurrent



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value11297113971139711397124101124114153170
Percentage of InterestPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryFinishedGoodsNetOfReserves



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-31
Value671696701699668667682718669651652648625854827846811850714769768725688702578587580589542575558586537592581560470438441
Percentage of InventoryFinishedGoodsNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryRawMaterialsNetOfReserves



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-31
Value343350361371366398401435381386383380408670650762720790572514508541584528474517502542536557565554532571550484401377359
Percentage of InventoryRawMaterialsNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventorySuppliesNetOfReserves



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-31
Value99999794879091898184817776205201206194193193190193217236234244250249265263270268268263270270262256249255
Percentage of InventorySuppliesNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryWorkInProcessNetOfReserves



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-31
Value1316141014471448137114671485140613491332130012231144132513441312127212331112110610351054107710068289559259468669339871001911104210901000814799680
Percentage of InventoryWorkInProcessNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LIFOInventoryAmount



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value12571310134313401292133913721302120811481057100294713111335138113731507156515901514146914451169
Percentage of LIFOInventoryAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermDebtAndCapitalLeaseObligations



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302008-12-31
Value490649055901589958966315631263096806680267968046804495018278825790449091871387118769879776127609760776307700774583118350854786188640865887738501884289908925897490678509
Percentage of LongTermDebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:LongTermDebtFairValue

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value4906490559015899589663156312630968066802679680468044950182788257904490918713871187697607
Percentage of LongTermDebtFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value53375288624061255873649564576631744374407249865285191019586708330892290629215945294457863
Percentage of LongTermDebtFairValue108.8107.8105.7103.899.6102.9102.3105.1109.4109.4106.7107.5105.9107.3104.7100.998.799.7105.8108.5107.7103.4

us-gaap:OperatingLeaseLiability



Period End2019-12-312019-09-302019-06-302019-03-31
Value265268288309
Percentage of OperatingLeaseLiability100.0100.0100.0100.0

us-gaap:OperatingLossCarryforwards



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value293231593305154019172075222921862035
Percentage of OperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ValuationAllowancesAndReservesType

arnc:ExpiresWithinElevenToTwentyYears



Period End2019-12-312018-12-312017-12-312016-12-31
Value235461781744
Percentage of OperatingLossCarryforwards8.014.623.648.3

arnc:ExpiresWithinTenYears



Period End2019-12-312018-12-312017-12-312016-12-31
Value4523008181
Percentage of OperatingLossCarryforwards15.49.52.55.3

arnc:NoExpiration



Period End2019-12-312018-12-312017-12-312016-12-31
Value224523982443715
Percentage of OperatingLossCarryforwards76.675.973.946.4

us-gaap:ConsolidationItems

us-gaap:OtherAssets

us-gaap:MaterialReconcilingItems



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value498570119132127901177321486510431327
Percentage of OtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherIntangibleAssetsNet



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1585183218849881158737399407494524
Percentage of OtherIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312009-09-302008-12-31
Value71462964163672377381583384181182286788921772070207721062110210521282155211922442333235425272541257826032516253625602583255526092606261526862689269627552730
Percentage of OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherReceivablesNetCurrent



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value484657640646451511478484339373357362477458494471522669688733
Percentage of OtherReceivablesNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value72838691
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit



Period End2019-12-312018-12-312017-12-312016-12-31
Value25232221
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities34.727.725.623.1

us-gaap:ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount



Period End2019-12-31
Value0.5
Percentage of ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount100.0

us-gaap:RestrictedCash



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-31
Value5533767545515
Percentage of RestrictedCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:StatementBusinessSegments

arnc:ForgingsBusiness, arnc:EngineeredProductsAndForgings



Period End2019-12-31
Value53
Percentage of RestrictedCash96.4

us-gaap:RestructuringReserve



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302009-12-312008-12-312007-12-31
Value344970672541333858768054591321661982508187861321722282481381181089611111012012813497107111116132226328157
Percentage of RestructuringReserve100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestructuringCostAndReserve

arnc:OtherExitCosts



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312014-12-312013-12-31
Value35531514722334940243429
Percentage of RestructuringReserve8.810.27.14.560.034.121.25.33.43.93.87.415.330.39.625.821.0

us-gaap:EmployeeSeverance



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value314465641027263656737750509212215622657605598135184208967260465960687377394753160251
Percentage of RestructuringReserve91.289.892.995.540.065.978.894.796.696.196.292.684.769.773.578.890.470.469.064.074.278.580.783.969.661.055.647.953.254.556.757.057.540.243.945.770.876.5

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber



Period End2019-12-312018-12-312017-12-312016-12-312013-12-312012-12-312011-12-312010-12-31
Value7778151197
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue



Period End2019-12-312018-12-312017-12-312016-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value22.0521.1321.4922.2610.8812.9613.6316.823.81
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShortTermBorrowings



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312009-06-302008-12-31
Value103414344344354344245453836385457536292176663478
Percentage of ShortTermBorrowings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareRepurchaseProgram

us-gaap:StockRepurchaseProgramAuthorizedAmount1

arnc:ShareRepurchasesProgramNovember2019



Period End2019-11-14
Value50
Percentage of StockRepurchaseProgramAuthorizedAmount1100.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-302007-12-312006-12-31
Value4621471048665178558553755218528249245961575354955141139451452914361141311469114638138431479415135147061437413522158641585816774165231685416914176261719518283193691840417086167781572515850155201621815581149371433217805195611847616431
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

arnc:MandatoryConvertiblePreferredStock



Period End2019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value00000033333333333
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.00.10.10.10.10.00.00.00.00.00.00.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustment



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value-2732-2255-2281-2304-2344-2021-2058-2087-2230-1900-1931-1979-2010-3611
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-59.1-47.9-46.9-44.5-42.0-37.6-39.4-39.5-45.3-31.9-33.6-36.0-39.1-25.6

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentAttributableToNoncontrollingInterest



Period End2019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value0000000000-56
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.00.00.00.00.0-0.4

us-gaap:AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterest



Period End2019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value000000-2-2-2-2-780
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.0-0.0-0.0-0.0-0.0-5.5

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value-10-194122218251224-1597
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.00.0-0.00.20.10.20.40.30.50.20.00.1-0.04.2

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value0100-3-3-4-2-2-1-299132-5
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.0-0.1-0.1-0.1-0.0-0.0-0.0-0.01.82.6-0.0

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-302007-12-312006-12-31
Value-3329-2928-2869-2852-2926-2544-2556-2386-2644-2327-2454-2498-2568-5858-5215-5175-5431-5532-4966-5591-4677-3836-3168-3301-3659-3714-3783-3309-3402-2777-2878-2406-2627-1725-858-1418-1675-1688-2393-2223-2092-1559-1945-2756-3169-1031140-337-1233
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-72.0-62.2-59.0-55.1-52.4-47.3-49.0-45.2-53.7-39.0-42.7-45.5-50.0-42.0-35.9-36.0-38.4-37.7-33.9-40.4-31.6-25.3-21.5-23.0-27.1-23.4-23.9-19.7-20.6-16.5-17.0-13.7-15.3-9.4-4.4-7.7-9.8-10.1-15.2-14.0-13.5-9.6-12.5-18.5-22.1-5.80.7-1.8-7.5

us-gaap:AccumulatedTranslationAdjustment



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value-596-674-587-557-583-532-516-315-437-438-523-622-689-2412
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-12.9-14.3-12.1-10.8-10.4-9.9-9.9-6.0-8.9-7.3-9.1-11.3-13.4-17.1

us-gaap:AdditionalPaidInCapital



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-302007-12-312006-12-31
Value73197314748476448319831082958280826682948262824982148197987798561001999549147912492848760763577047509753675247508756075497538752375617545752275087087709470917100660866126601657958505842582757745817
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest158.4155.3153.8147.6149.0154.6159.0156.8167.9139.1143.6150.1159.858.868.068.670.967.862.565.962.857.951.953.655.547.547.444.845.844.844.642.744.041.338.840.841.542.345.144.842.640.842.444.040.832.829.831.335.4

us-gaap:AociAttributableToNoncontrollingInterest



Period End2019-12-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-31
Value00000-2-2-2
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.0-0.0-0.0-0.0

us-gaap:CommonStock



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-302007-12-312006-12-31
Value433434440453483483483483481442441441438438139113911391139113041304130412671267126711781178117811781178117811781178117811781178117811411141114111411097109710971097925925925925925
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest9.49.29.08.78.69.09.39.19.87.47.78.08.53.19.69.79.89.58.99.48.88.48.68.88.77.47.47.07.17.07.06.76.96.46.16.46.76.87.37.27.16.87.07.36.55.24.75.05.6

us-gaap:NoncontrollingInterest



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-302007-12-312006-12-31
Value14141212121414141413131326217021942135208520972324226924882739302929832929300830433353332432843256348433513364371736303475342531163181310029842764250025972740285924601800
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.30.30.20.20.20.30.30.30.30.20.20.20.515.615.114.914.814.315.916.416.818.120.620.821.719.019.220.020.119.519.319.819.518.419.219.720.320.419.820.120.018.417.716.718.115.414.613.311.0

us-gaap:RetainedEarnings



Period End2019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-302007-12-312006-12-31
Value129-179-256-134-358-943-1073-1164-1248-519-567-768-1027894088718753883495539605952093799276916390619272116111165311805116891144711655116901162911820117141142411149109221089210787110201129711281117341240013600136071303911066
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest2.8-3.8-5.3-2.6-6.4-17.5-20.6-22.0-25.3-8.7-9.9-14.0-20.064.161.160.962.565.065.668.863.461.362.363.068.673.273.570.470.767.968.966.367.664.760.562.165.365.169.368.171.069.772.478.686.576.469.670.667.3

us-gaap:TaxCreditCarryforwardAmount



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value379579638652693625567508477
Percentage of TaxCreditCarryforwardAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ValuationAllowancesAndReservesType

arnc:ExpiresWithinElevenToTwentyYears



Period End2019-12-312018-12-312017-12-312016-12-31
Value69709789
Percentage of TaxCreditCarryforwardAmount18.212.115.213.7

arnc:ExpiresWithinTenYears



Period End2019-12-312018-12-312017-12-312016-12-31
Value300497531428
Percentage of TaxCreditCarryforwardAmount79.285.883.265.6

arnc:NoExpiration



Period End2019-12-312018-12-312017-12-312016-12-31
Value101210100
Percentage of TaxCreditCarryforwardAmount2.62.11.615.3

arnc:OtherDeferredTaxAssets



Period End2019-12-312018-12-312017-12-312016-12-31
Value00035
Percentage of TaxCreditCarryforwardAmount0.00.00.05.4

us-gaap:TaxCreditCarryforwardValuationAllowance



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1310379194020371668180414001398
Percentage of TaxCreditCarryforwardValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TaxCreditCarryforward

us-gaap:CapitalLossCarryforward



Period End2019-12-31
Value10
Percentage of TaxCreditCarryforwardValuationAllowance76.9

us-gaap:ShareRepurchaseProgram

us-gaap:TreasuryStockCommonValue

arnc:AcceleratedShareRepurchaseProgram



Period End2019-12-312019-09-302019-06-30
Value11501100900
Percentage of TreasuryStockCommonValue100.0100.0100.0

arnc:ShareRepurchasesProgramNovember2019



Period End2019-12-31
Value50
Percentage of TreasuryStockCommonValue4.3

us-gaap:StatementEquityComponents

us-gaap:TreasuryStockShares

us-gaap:TreasuryStock



Period End2019-12-312018-12-312017-12-312016-12-312015-12-31
Value000081
Percentage of TreasuryStockShares0.00.00.00.0100.0

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued



Period End2019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value2321229911151213
Percentage of UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Line plots across dimensions of each concept

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments


us-gaap:Assets us-gaap:StatementBusinessSegments


us-gaap:PropertyPlantAndEquipmentGross us-gaap:ConsolidationItems, us-gaap:PropertyPlantAndEquipmentByType


us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType


us-gaap:Goodwill us-gaap:StatementBusinessSegments


us-gaap:Goodwill us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments


us-gaap:Goodwill us-gaap:ReportingUnit


us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass


us-gaap:LongTermDebt us-gaap:DebtInstrument


us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType


us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument, us-gaap:SubsequentEventType