10-Q Filing

ALCOA CORP CIK: 1675149 Q3 2025

Filing Information

Form Type	10-Q
Accession Number	`0001193125-25-253570`
Period End Date	20250930
Filing Date	20251028
Fiscal Year	2025
Fiscal Period	Q3
XBRL Instance	aa-20250930_htm.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 176 Income Statement 128 Cash Flow Statement 190 Stockholders Equity 144 Comprehensive Income 152

Balance Sheet 176 line items

Line Item	Tag	Value	Unit	Period
Cash and cash equivalents (M)	`CashAndCashEquivalentsAtCarryingValue`	$1.14B	USD	Point-in-time
Cash and cash equivalents (M)	`CashAndCashEquivalentsAtCarryingValue`	$1.14B	USD	Point-in-time
Cash and cash equivalents (M)	`CashAndCashEquivalentsAtCarryingValue`	$1.49B	USD	Point-in-time
Cash and cash equivalents (M)	`CashAndCashEquivalentsAtCarryingValue`	$1.49B	USD	Point-in-time
Receivables from customers (I)	`AccountsReceivableNetCurrent`	$1.10B	USD	Point-in-time
Receivables from customers (I)	`AccountsReceivableNetCurrent`	$1.10B	USD	Point-in-time
Receivables from customers (I)	`AccountsReceivableNetCurrent`	$1.04B	USD	Point-in-time
Receivables from customers (I)	`AccountsReceivableNetCurrent`	$1.04B	USD	Point-in-time
Other receivables	`OtherReceivablesNetCurrent`	$143.00M	USD	Point-in-time
Other receivables	`OtherReceivablesNetCurrent`	$143.00M	USD	Point-in-time
Other receivables	`OtherReceivablesNetCurrent`	$149.00M	USD	Point-in-time
Other receivables	`OtherReceivablesNetCurrent`	$149.00M	USD	Point-in-time
Inventories (J)	`InventoryNet`	$2.00B	USD	Point-in-time
Inventories (J)	`InventoryNet`	$2.00B	USD	Point-in-time
Inventories (J)	`InventoryNet`	$2.19B	USD	Point-in-time
Inventories (J)	`InventoryNet`	$2.19B	USD	Point-in-time
Fair value of derivative instruments (M)	`DerivativeAssetsCurrent`	$25.00M	USD	Point-in-time
Fair value of derivative instruments (M)	`DerivativeAssetsCurrent`	$25.00M	USD	Point-in-time
Fair value of derivative instruments (M)	`DerivativeAssetsCurrent`	$44.00M	USD	Point-in-time
Fair value of derivative instruments (M)	`DerivativeAssetsCurrent`	$44.00M	USD	Point-in-time
Prepaid expenses and other current assets	`PrepaidExpenseAndOtherAssetsCurrent`	$514.00M	USD	Point-in-time
Prepaid expenses and other current assets	`PrepaidExpenseAndOtherAssetsCurrent`	$514.00M	USD	Point-in-time
Prepaid expenses and other current assets	`PrepaidExpenseAndOtherAssetsCurrent`	$370.00M	USD	Point-in-time
Prepaid expenses and other current assets	`PrepaidExpenseAndOtherAssetsCurrent`	$370.00M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$4.91B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$4.91B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$5.28B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$5.28B	USD	Point-in-time
Properties, plants, and equipment	`PropertyPlantAndEquipmentGross`	$19.55B	USD	Point-in-time
Properties, plants, and equipment	`PropertyPlantAndEquipmentGross`	$19.55B	USD	Point-in-time
Properties, plants, and equipment	`PropertyPlantAndEquipmentGross`	$20.80B	USD	Point-in-time
Properties, plants, and equipment	`PropertyPlantAndEquipmentGross`	$20.80B	USD	Point-in-time
Less: accumulated depreciation, depletion, and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$13.16B	USD	Point-in-time
Less: accumulated depreciation, depletion, and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$13.16B	USD	Point-in-time
Less: accumulated depreciation, depletion, and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$14.17B	USD	Point-in-time
Less: accumulated depreciation, depletion, and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$14.17B	USD	Point-in-time
Properties, plants, and equipment, net	`PropertyPlantAndEquipmentNet`	$6.39B	USD	Point-in-time
Properties, plants, and equipment, net	`PropertyPlantAndEquipmentNet`	$6.39B	USD	Point-in-time
Properties, plants, and equipment, net	`PropertyPlantAndEquipmentNet`	$6.63B	USD	Point-in-time
Properties, plants, and equipment, net	`PropertyPlantAndEquipmentNet`	$6.63B	USD	Point-in-time
Investments (H)	`InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures`	$980.00M	USD	Point-in-time
Investments (H)	`InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures`	$980.00M	USD	Point-in-time
Investments (H)	`InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures`	$480.00M	USD	Point-in-time
Investments (H)	`InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures`	$480.00M	USD	Point-in-time
Noncurrent marketable securities (C & M)	`MarketableSecuritiesNoncurrent`	-	USD	Point-in-time
Noncurrent marketable securities (C & M)	`MarketableSecuritiesNoncurrent`	-	USD	Point-in-time
Noncurrent marketable securities (C & M)	`MarketableSecuritiesNoncurrent`	$1.47B	USD	Point-in-time
Noncurrent marketable securities (C & M)	`MarketableSecuritiesNoncurrent`	$1.47B	USD	Point-in-time
Deferred income taxes	`DeferredIncomeTaxAssetsNet`	$284.00M	USD	Point-in-time
Deferred income taxes	`DeferredIncomeTaxAssetsNet`	$284.00M	USD	Point-in-time
Deferred income taxes	`DeferredIncomeTaxAssetsNet`	$524.00M	USD	Point-in-time
Deferred income taxes	`DeferredIncomeTaxAssetsNet`	$524.00M	USD	Point-in-time
Fair value of derivative instruments (M)	`DerivativeAssetsNoncurrent`	-	USD	Point-in-time
Fair value of derivative instruments (M)	`DerivativeAssetsNoncurrent`	-	USD	Point-in-time
Fair value of derivative instruments (M)	`DerivativeAssetsNoncurrent`	$47.00M	USD	Point-in-time
Fair value of derivative instruments (M)	`DerivativeAssetsNoncurrent`	$47.00M	USD	Point-in-time
Other noncurrent assets (Q)	`OtherAssetsNoncurrent`	$1.50B	USD	Point-in-time
Other noncurrent assets (Q)	`OtherAssetsNoncurrent`	$1.50B	USD	Point-in-time
Other noncurrent assets (Q)	`OtherAssetsNoncurrent`	$1.54B	USD	Point-in-time
Other noncurrent assets (Q)	`OtherAssetsNoncurrent`	$1.54B	USD	Point-in-time
Total assets	`Assets`	$14.06B	USD	Point-in-time
Total assets	`Assets`	$14.06B	USD	Point-in-time
Total assets	`Assets`	$15.97B	USD	Point-in-time
Total assets	`Assets`	$15.97B	USD	Point-in-time
Accounts payable, trade	`AccountsPayableCurrent`	$1.80B	USD	Point-in-time
Accounts payable, trade	`AccountsPayableCurrent`	$1.80B	USD	Point-in-time
Accounts payable, trade	`AccountsPayableCurrent`	$1.62B	USD	Point-in-time
Accounts payable, trade	`AccountsPayableCurrent`	$1.62B	USD	Point-in-time
Accrued compensation and retirement costs	`EmployeeRelatedLiabilitiesCurrent`	$362.00M	USD	Point-in-time
Accrued compensation and retirement costs	`EmployeeRelatedLiabilitiesCurrent`	$362.00M	USD	Point-in-time
Accrued compensation and retirement costs	`EmployeeRelatedLiabilitiesCurrent`	$370.00M	USD	Point-in-time
Accrued compensation and retirement costs	`EmployeeRelatedLiabilitiesCurrent`	$370.00M	USD	Point-in-time
Taxes, including income taxes	`TaxesPayableCurrent`	$102.00M	USD	Point-in-time
Taxes, including income taxes	`TaxesPayableCurrent`	$102.00M	USD	Point-in-time
Taxes, including income taxes	`TaxesPayableCurrent`	$339.00M	USD	Point-in-time
Taxes, including income taxes	`TaxesPayableCurrent`	$339.00M	USD	Point-in-time
Fair value of derivative instruments (M)	`DerivativeLiabilitiesCurrent`	$263.00M	USD	Point-in-time
Fair value of derivative instruments (M)	`DerivativeLiabilitiesCurrent`	$263.00M	USD	Point-in-time
Fair value of derivative instruments (M)	`DerivativeLiabilitiesCurrent`	$329.00M	USD	Point-in-time
Fair value of derivative instruments (M)	`DerivativeLiabilitiesCurrent`	$329.00M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$788.00M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$788.00M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$730.00M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$730.00M	USD	Point-in-time
Long-term debt due within one year (K & M)	`LongTermDebtAndCapitalLeaseObligationsCurrent`	$75.00M	USD	Point-in-time
Long-term debt due within one year (K & M)	`LongTermDebtAndCapitalLeaseObligationsCurrent`	$75.00M	USD	Point-in-time
Long-term debt due within one year (K & M)	`LongTermDebtAndCapitalLeaseObligationsCurrent`	-	USD	Point-in-time
Long-term debt due within one year (K & M)	`LongTermDebtAndCapitalLeaseObligationsCurrent`	-	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$3.40B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$3.40B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$3.39B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$3.39B	USD	Point-in-time
Long-term debt, less amount due within one year (K & M)	`LongTermDebtAndCapitalLeaseObligations`	$2.47B	USD	Point-in-time
Long-term debt, less amount due within one year (K & M)	`LongTermDebtAndCapitalLeaseObligations`	$2.47B	USD	Point-in-time
Long-term debt, less amount due within one year (K & M)	`LongTermDebtAndCapitalLeaseObligations`	$2.58B	USD	Point-in-time
Long-term debt, less amount due within one year (K & M)	`LongTermDebtAndCapitalLeaseObligations`	$2.58B	USD	Point-in-time
Accrued pension benefits (L)	`DefinedBenefitPensionPlanLiabilitiesNoncurrent`	$256.00M	USD	Point-in-time
Accrued pension benefits (L)	`DefinedBenefitPensionPlanLiabilitiesNoncurrent`	$256.00M	USD	Point-in-time
Accrued pension benefits (L)	`DefinedBenefitPensionPlanLiabilitiesNoncurrent`	$227.00M	USD	Point-in-time
Accrued pension benefits (L)	`DefinedBenefitPensionPlanLiabilitiesNoncurrent`	$227.00M	USD	Point-in-time
Accrued other postretirement benefits (L)	`OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent`	$412.00M	USD	Point-in-time
Accrued other postretirement benefits (L)	`OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent`	$412.00M	USD	Point-in-time
Accrued other postretirement benefits (L)	`OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent`	$391.00M	USD	Point-in-time
Accrued other postretirement benefits (L)	`OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent`	$391.00M	USD	Point-in-time
Asset retirement obligations (O)	`AssetRetirementObligationsNoncurrent`	$691.00M	USD	Point-in-time
Asset retirement obligations (O)	`AssetRetirementObligationsNoncurrent`	$691.00M	USD	Point-in-time
Asset retirement obligations (O)	`AssetRetirementObligationsNoncurrent`	$1.21B	USD	Point-in-time
Asset retirement obligations (O)	`AssetRetirementObligationsNoncurrent`	$1.21B	USD	Point-in-time
Environmental remediation (P)	`AccruedEnvironmentalLossContingenciesNoncurrent`	$182.00M	USD	Point-in-time
Environmental remediation (P)	`AccruedEnvironmentalLossContingenciesNoncurrent`	$182.00M	USD	Point-in-time
Environmental remediation (P)	`AccruedEnvironmentalLossContingenciesNoncurrent`	$205.00M	USD	Point-in-time
Environmental remediation (P)	`AccruedEnvironmentalLossContingenciesNoncurrent`	$205.00M	USD	Point-in-time
Fair value of derivative instruments (M)	`DerivativeLiabilitiesNoncurrent`	$836.00M	USD	Point-in-time
Fair value of derivative instruments (M)	`DerivativeLiabilitiesNoncurrent`	$836.00M	USD	Point-in-time
Fair value of derivative instruments (M)	`DerivativeLiabilitiesNoncurrent`	$929.00M	USD	Point-in-time
Fair value of derivative instruments (M)	`DerivativeLiabilitiesNoncurrent`	$929.00M	USD	Point-in-time
Noncurrent income taxes	`AccruedIncomeTaxesNoncurrent`	$9.00M	USD	Point-in-time
Noncurrent income taxes	`AccruedIncomeTaxesNoncurrent`	$9.00M	USD	Point-in-time
Noncurrent income taxes	`AccruedIncomeTaxesNoncurrent`	$109.00M	USD	Point-in-time
Noncurrent income taxes	`AccruedIncomeTaxesNoncurrent`	$109.00M	USD	Point-in-time
Other noncurrent liabilities and deferred credits	`DeferredCreditsAndOtherLiabilitiesNoncurrent`	$656.00M	USD	Point-in-time
Other noncurrent liabilities and deferred credits	`DeferredCreditsAndOtherLiabilitiesNoncurrent`	$656.00M	USD	Point-in-time
Other noncurrent liabilities and deferred credits	`DeferredCreditsAndOtherLiabilitiesNoncurrent`	$506.00M	USD	Point-in-time
Other noncurrent liabilities and deferred credits	`DeferredCreditsAndOtherLiabilitiesNoncurrent`	$506.00M	USD	Point-in-time
Total liabilities	`Liabilities`	$8.91B	USD	Point-in-time
Total liabilities	`Liabilities`	$8.91B	USD	Point-in-time
Total liabilities	`Liabilities`	$9.54B	USD	Point-in-time
Total liabilities	`Liabilities`	$9.54B	USD	Point-in-time
CONTINGENCIES AND COMMITMENTS (P)	`CommitmentsAndContingencies`	-	USD	Point-in-time
CONTINGENCIES AND COMMITMENTS (P)	`CommitmentsAndContingencies`	-	USD	Point-in-time
CONTINGENCIES AND COMMITMENTS (P)	`CommitmentsAndContingencies`	-	USD	Point-in-time
CONTINGENCIES AND COMMITMENTS (P)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Noncontrolling interest (C)	`RedeemableNoncontrollingInterestEquityCarryingAmount`	-	USD	Point-in-time
Noncontrolling interest (C)	`RedeemableNoncontrollingInterestEquityCarryingAmount`	-	USD	Point-in-time
Noncontrolling interest (C)	`RedeemableNoncontrollingInterestEquityCarryingAmount`	$86.00M	USD	Point-in-time
Noncontrolling interest (C)	`RedeemableNoncontrollingInterestEquityCarryingAmount`	$86.00M	USD	Point-in-time
Preferred stock	`PreferredStockValue`	-	USD	Point-in-time
Preferred stock	`PreferredStockValue`	-	USD	Point-in-time
Preferred stock	`PreferredStockValue`	-	USD	Point-in-time
Preferred stock	`PreferredStockValue`	-	USD	Point-in-time
Common stock	`CommonStockValue`	$3.00M	USD	Point-in-time
Common stock	`CommonStockValue`	$3.00M	USD	Point-in-time
Common stock	`CommonStockValue`	$3.00M	USD	Point-in-time
Common stock	`CommonStockValue`	$3.00M	USD	Point-in-time
Additional capital	`AdditionalPaidInCapitalCommonStock`	$11.59B	USD	Point-in-time
Additional capital	`AdditionalPaidInCapitalCommonStock`	$11.59B	USD	Point-in-time
Additional capital	`AdditionalPaidInCapitalCommonStock`	$11.57B	USD	Point-in-time
Additional capital	`AdditionalPaidInCapitalCommonStock`	$11.57B	USD	Point-in-time
Accumulated deficit	`RetainedEarningsAccumulatedDeficit`	$-1.32B	USD	Point-in-time
Accumulated deficit	`RetainedEarningsAccumulatedDeficit`	$-1.32B	USD	Point-in-time
Accumulated deficit	`RetainedEarningsAccumulatedDeficit`	$-458.00M	USD	Point-in-time
Accumulated deficit	`RetainedEarningsAccumulatedDeficit`	$-458.00M	USD	Point-in-time
Accumulated other comprehensive loss (G)	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-5.11B	USD	Point-in-time
Accumulated other comprehensive loss (G)	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-5.11B	USD	Point-in-time
Accumulated other comprehensive loss (G)	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-4.77B	USD	Point-in-time
Accumulated other comprehensive loss (G)	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-4.77B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.84B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.84B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.53B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.53B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.42B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.42B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.25B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.25B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.16B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.16B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.82B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.82B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.13B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.13B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.34B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.34B	USD	Point-in-time
Total liabilities, mezzanine equity, and equity	`LiabilitiesAndStockholdersEquity`	$14.06B	USD	Point-in-time
Total liabilities, mezzanine equity, and equity	`LiabilitiesAndStockholdersEquity`	$14.06B	USD	Point-in-time
Total liabilities, mezzanine equity, and equity	`LiabilitiesAndStockholdersEquity`	$15.97B	USD	Point-in-time
Total liabilities, mezzanine equity, and equity	`LiabilitiesAndStockholdersEquity`	$15.97B	USD	Point-in-time

Income Statement 128 line items

Line Item	Tag	Value	Unit	Period
Sales (E)	`RevenueFromContractWithCustomerExcludingAssessedTax`	$2.90B	USD	1 Quarter
Sales (E)	`RevenueFromContractWithCustomerExcludingAssessedTax`	$2.90B	USD	1 Quarter
Sales (E)	`RevenueFromContractWithCustomerExcludingAssessedTax`	$8.41B	USD	3 Qtrs
Sales (E)	`RevenueFromContractWithCustomerExcludingAssessedTax`	$8.41B	USD	3 Qtrs
Sales (E)	`RevenueFromContractWithCustomerExcludingAssessedTax`	$3.00B	USD	1 Quarter
Sales (E)	`RevenueFromContractWithCustomerExcludingAssessedTax`	$3.00B	USD	1 Quarter
Sales (E)	`RevenueFromContractWithCustomerExcludingAssessedTax`	$9.38B	USD	3 Qtrs
Sales (E)	`RevenueFromContractWithCustomerExcludingAssessedTax`	$9.38B	USD	3 Qtrs
Cost of goods sold (exclusive of expenses below)	`CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization`	$2.39B	USD	1 Quarter
Cost of goods sold (exclusive of expenses below)	`CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization`	$2.39B	USD	1 Quarter
Cost of goods sold (exclusive of expenses below)	`CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization`	$7.33B	USD	3 Qtrs
Cost of goods sold (exclusive of expenses below)	`CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization`	$7.33B	USD	3 Qtrs
Cost of goods sold (exclusive of expenses below)	`CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization`	$2.69B	USD	1 Quarter
Cost of goods sold (exclusive of expenses below)	`CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization`	$2.69B	USD	1 Quarter
Cost of goods sold (exclusive of expenses below)	`CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization`	$7.79B	USD	3 Qtrs
Cost of goods sold (exclusive of expenses below)	`CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization`	$7.79B	USD	3 Qtrs
Selling, general administrative, and other expenses	`SellingGeneralAndAdministrativeExpense`	$66.00M	USD	1 Quarter
Selling, general administrative, and other expenses	`SellingGeneralAndAdministrativeExpense`	$66.00M	USD	1 Quarter
Selling, general administrative, and other expenses	`SellingGeneralAndAdministrativeExpense`	$195.00M	USD	3 Qtrs
Selling, general administrative, and other expenses	`SellingGeneralAndAdministrativeExpense`	$195.00M	USD	3 Qtrs
Selling, general administrative, and other expenses	`SellingGeneralAndAdministrativeExpense`	$78.00M	USD	1 Quarter
Selling, general administrative, and other expenses	`SellingGeneralAndAdministrativeExpense`	$78.00M	USD	1 Quarter
Selling, general administrative, and other expenses	`SellingGeneralAndAdministrativeExpense`	$231.00M	USD	3 Qtrs
Selling, general administrative, and other expenses	`SellingGeneralAndAdministrativeExpense`	$231.00M	USD	3 Qtrs
Research and development expenses	`ResearchAndDevelopmentExpense`	$16.00M	USD	1 Quarter
Research and development expenses	`ResearchAndDevelopmentExpense`	$16.00M	USD	1 Quarter
Research and development expenses	`ResearchAndDevelopmentExpense`	$40.00M	USD	3 Qtrs
Research and development expenses	`ResearchAndDevelopmentExpense`	$40.00M	USD	3 Qtrs
Research and development expenses	`ResearchAndDevelopmentExpense`	$11.00M	USD	1 Quarter
Research and development expenses	`ResearchAndDevelopmentExpense`	$11.00M	USD	1 Quarter
Research and development expenses	`ResearchAndDevelopmentExpense`	$35.00M	USD	3 Qtrs
Research and development expenses	`ResearchAndDevelopmentExpense`	$35.00M	USD	3 Qtrs
Provision for depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$159.00M	USD	1 Quarter
Provision for depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$159.00M	USD	1 Quarter
Provision for depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$483.00M	USD	3 Qtrs
Provision for depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$483.00M	USD	3 Qtrs
Provision for depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$160.00M	USD	1 Quarter
Provision for depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$160.00M	USD	1 Quarter
Provision for depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$461.00M	USD	3 Qtrs
Provision for depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$461.00M	USD	3 Qtrs
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$30.00M	USD	1 Quarter
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$30.00M	USD	1 Quarter
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$250.00M	USD	3 Qtrs
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$250.00M	USD	3 Qtrs
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$885.00M	USD	1 Quarter
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$885.00M	USD	1 Quarter
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$904.00M	USD	3 Qtrs
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$904.00M	USD	3 Qtrs
Interest expense	`InterestExpense`	$44.00M	USD	1 Quarter
Interest expense	`InterestExpense`	$44.00M	USD	1 Quarter
Interest expense	`InterestExpense`	$111.00M	USD	3 Qtrs
Interest expense	`InterestExpense`	$111.00M	USD	3 Qtrs
Interest expense	`InterestExpense`	$33.00M	USD	1 Quarter
Interest expense	`InterestExpense`	$33.00M	USD	1 Quarter
Interest expense	`InterestExpense`	$142.00M	USD	3 Qtrs
Interest expense	`InterestExpense`	$142.00M	USD	3 Qtrs
Other (income) expenses, net (Q)	`NonoperatingIncomeExpense`	$-12.00M	USD	1 Quarter
Other (income) expenses, net (Q)	`NonoperatingIncomeExpense`	$-12.00M	USD	1 Quarter
Other (income) expenses, net (Q)	`NonoperatingIncomeExpense`	$-49.00M	USD	3 Qtrs
Other (income) expenses, net (Q)	`NonoperatingIncomeExpense`	$-49.00M	USD	3 Qtrs
Other (income) expenses, net (Q)	`NonoperatingIncomeExpense`	$1.03B	USD	1 Quarter
Other (income) expenses, net (Q)	`NonoperatingIncomeExpense`	$1.03B	USD	1 Quarter
Other (income) expenses, net (Q)	`NonoperatingIncomeExpense`	$1.17B	USD	3 Qtrs
Other (income) expenses, net (Q)	`NonoperatingIncomeExpense`	$1.17B	USD	3 Qtrs
Total costs and expenses	`CostsAndOperatingExpensesAndNonoperatingIncomeExpenses`	$2.72B	USD	1 Quarter
Total costs and expenses	`CostsAndOperatingExpensesAndNonoperatingIncomeExpenses`	$2.72B	USD	1 Quarter
Total costs and expenses	`CostsAndOperatingExpensesAndNonoperatingIncomeExpenses`	$8.46B	USD	3 Qtrs
Total costs and expenses	`CostsAndOperatingExpensesAndNonoperatingIncomeExpenses`	$8.46B	USD	3 Qtrs
Total costs and expenses	`CostsAndOperatingExpensesAndNonoperatingIncomeExpenses`	$2.83B	USD	1 Quarter
Total costs and expenses	`CostsAndOperatingExpensesAndNonoperatingIncomeExpenses`	$2.83B	USD	1 Quarter
Total costs and expenses	`CostsAndOperatingExpensesAndNonoperatingIncomeExpenses`	$8.39B	USD	3 Qtrs
Total costs and expenses	`CostsAndOperatingExpensesAndNonoperatingIncomeExpenses`	$8.39B	USD	3 Qtrs
Consolidated income (loss) before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$184.00M	USD	1 Quarter
Consolidated income (loss) before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$184.00M	USD	1 Quarter
Consolidated income (loss) before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$-49.00M	USD	3 Qtrs
Consolidated income (loss) before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$-49.00M	USD	3 Qtrs
Consolidated income (loss) before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$167.00M	USD	1 Quarter
Consolidated income (loss) before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$167.00M	USD	1 Quarter
Consolidated income (loss) before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$996.00M	USD	3 Qtrs
Consolidated income (loss) before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$996.00M	USD	3 Qtrs
(Benefit from) provision for income taxes	`IncomeTaxExpenseBenefit`	$86.00M	USD	1 Quarter
(Benefit from) provision for income taxes	`IncomeTaxExpenseBenefit`	$86.00M	USD	1 Quarter
(Benefit from) provision for income taxes	`IncomeTaxExpenseBenefit`	$129.00M	USD	3 Qtrs
(Benefit from) provision for income taxes	`IncomeTaxExpenseBenefit`	$129.00M	USD	3 Qtrs
(Benefit from) provision for income taxes	`IncomeTaxExpenseBenefit`	$-51.00M	USD	1 Quarter
(Benefit from) provision for income taxes	`IncomeTaxExpenseBenefit`	$-51.00M	USD	1 Quarter
(Benefit from) provision for income taxes	`IncomeTaxExpenseBenefit`	$79.00M	USD	3 Qtrs
(Benefit from) provision for income taxes	`IncomeTaxExpenseBenefit`	$79.00M	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$98.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$98.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$-178.00M	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$-178.00M	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$218.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$218.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$917.00M	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$917.00M	USD	3 Qtrs
Less: Net (loss) income attributable to noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$8.00M	USD	1 Quarter
Less: Net (loss) income attributable to noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$8.00M	USD	1 Quarter
Less: Net (loss) income attributable to noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-36.00M	USD	3 Qtrs
Less: Net (loss) income attributable to noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-36.00M	USD	3 Qtrs
Less: Net (loss) income attributable to noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-14.00M	USD	1 Quarter
Less: Net (loss) income attributable to noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-14.00M	USD	1 Quarter
Less: Net (loss) income attributable to noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-27.00M	USD	3 Qtrs
Less: Net (loss) income attributable to noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-27.00M	USD	3 Qtrs
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	`NetIncomeLoss`	$90.00M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	`NetIncomeLoss`	$90.00M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	`NetIncomeLoss`	$-142.00M	USD	3 Qtrs
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	`NetIncomeLoss`	$-142.00M	USD	3 Qtrs
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	`NetIncomeLoss`	$232.00M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	`NetIncomeLoss`	$232.00M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	`NetIncomeLoss`	$944.00M	USD	3 Qtrs
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	`NetIncomeLoss`	$944.00M	USD	3 Qtrs
Basic	`EarningsPerShareBasic`	$0.39	USD	1 Quarter
Basic	`EarningsPerShareBasic`	$0.39	USD	1 Quarter
Basic	`EarningsPerShareBasic`	$-0.72	USD	3 Qtrs
Basic	`EarningsPerShareBasic`	$-0.72	USD	3 Qtrs
Basic	`EarningsPerShareBasic`	$0.88	USD	1 Quarter
Basic	`EarningsPerShareBasic`	$0.88	USD	1 Quarter
Basic	`EarningsPerShareBasic`	$3.59	USD	3 Qtrs
Basic	`EarningsPerShareBasic`	$3.59	USD	3 Qtrs
Diluted	`EarningsPerShareDiluted`	$0.38	USD	1 Quarter
Diluted	`EarningsPerShareDiluted`	$0.38	USD	1 Quarter
Diluted	`EarningsPerShareDiluted`	$-0.72	USD	3 Qtrs
Diluted	`EarningsPerShareDiluted`	$-0.72	USD	3 Qtrs
Diluted	`EarningsPerShareDiluted`	$0.88	USD	1 Quarter
Diluted	`EarningsPerShareDiluted`	$0.88	USD	1 Quarter
Diluted	`EarningsPerShareDiluted`	$3.57	USD	3 Qtrs
Diluted	`EarningsPerShareDiluted`	$3.57	USD	3 Qtrs

Cash Flow Statement 190 line items

Line Item	Tag	Value	Unit	Period
Net income (loss)	`ProfitLoss`	$98.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$98.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$-178.00M	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$-178.00M	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$218.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$218.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$917.00M	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$917.00M	USD	3 Qtrs
Depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$159.00M	USD	1 Quarter
Depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$159.00M	USD	1 Quarter
Depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$483.00M	USD	3 Qtrs
Depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$483.00M	USD	3 Qtrs
Depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$160.00M	USD	1 Quarter
Depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$160.00M	USD	1 Quarter
Depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$461.00M	USD	3 Qtrs
Depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$461.00M	USD	3 Qtrs
Deferred income taxes	`DeferredIncomeTaxExpenseBenefit`	$-8.00M	USD	3 Qtrs
Deferred income taxes	`DeferredIncomeTaxExpenseBenefit`	$-8.00M	USD	3 Qtrs
Deferred income taxes	`DeferredIncomeTaxExpenseBenefit`	$-205.00M	USD	3 Qtrs
Deferred income taxes	`DeferredIncomeTaxExpenseBenefit`	$-205.00M	USD	3 Qtrs
Equity loss, net of dividends (H)	`IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions`	$-2.00M	USD	3 Qtrs
Equity loss, net of dividends (H)	`IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions`	$-2.00M	USD	3 Qtrs
Equity loss, net of dividends (H)	`IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions`	$-1.00M	USD	3 Qtrs
Equity loss, net of dividends (H)	`IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions`	$-1.00M	USD	3 Qtrs
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$30.00M	USD	1 Quarter
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$30.00M	USD	1 Quarter
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$250.00M	USD	3 Qtrs
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$250.00M	USD	3 Qtrs
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$885.00M	USD	1 Quarter
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$885.00M	USD	1 Quarter
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$904.00M	USD	3 Qtrs
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$904.00M	USD	3 Qtrs
Net (gain) loss from investing activities - asset and investment sales (Q)	`GainLossOnDispositionOfAssets1`	$-18.00M	USD	3 Qtrs
Net (gain) loss from investing activities - asset and investment sales (Q)	`GainLossOnDispositionOfAssets1`	$-18.00M	USD	3 Qtrs
Net (gain) loss from investing activities - asset and investment sales (Q)	`GainLossOnDispositionOfAssets1`	$785.00M	USD	3 Qtrs
Net (gain) loss from investing activities - asset and investment sales (Q)	`GainLossOnDispositionOfAssets1`	$785.00M	USD	3 Qtrs
Mark-to-market gain on noncurrent marketable securities (Q)	`GainOnMarkToMarketNoncurrentMarketableSecurities`	-	USD	3 Qtrs
Mark-to-market gain on noncurrent marketable securities (Q)	`GainOnMarkToMarketNoncurrentMarketableSecurities`	-	USD	3 Qtrs
Mark-to-market gain on noncurrent marketable securities (Q)	`GainOnMarkToMarketNoncurrentMarketableSecurities`	$267.00M	USD	3 Qtrs
Mark-to-market gain on noncurrent marketable securities (Q)	`GainOnMarkToMarketNoncurrentMarketableSecurities`	$267.00M	USD	3 Qtrs
Net periodic pension benefit cost (L)	`DefinedBenefitPensionPlansNetPeriodicBenefitCost`	$8.00M	USD	3 Qtrs
Net periodic pension benefit cost (L)	`DefinedBenefitPensionPlansNetPeriodicBenefitCost`	$8.00M	USD	3 Qtrs
Net periodic pension benefit cost (L)	`DefinedBenefitPensionPlansNetPeriodicBenefitCost`	$14.00M	USD	3 Qtrs
Net periodic pension benefit cost (L)	`DefinedBenefitPensionPlansNetPeriodicBenefitCost`	$14.00M	USD	3 Qtrs
Stock-based compensation	`ShareBasedCompensation`	$31.00M	USD	3 Qtrs
Stock-based compensation	`ShareBasedCompensation`	$31.00M	USD	3 Qtrs
Stock-based compensation	`ShareBasedCompensation`	$33.00M	USD	3 Qtrs
Stock-based compensation	`ShareBasedCompensation`	$33.00M	USD	3 Qtrs
(Gain) loss on mark-to-market derivative financial contracts	`GainLossOnMarkToMarketDerivativeFinancialContracts`	$-16.00M	USD	3 Qtrs
(Gain) loss on mark-to-market derivative financial contracts	`GainLossOnMarkToMarketDerivativeFinancialContracts`	$-16.00M	USD	3 Qtrs
(Gain) loss on mark-to-market derivative financial contracts	`GainLossOnMarkToMarketDerivativeFinancialContracts`	$48.00M	USD	3 Qtrs
(Gain) loss on mark-to-market derivative financial contracts	`GainLossOnMarkToMarketDerivativeFinancialContracts`	$48.00M	USD	3 Qtrs
Other	`OtherNoncashIncomeExpense`	$-33.00M	USD	3 Qtrs
Other	`OtherNoncashIncomeExpense`	$-33.00M	USD	3 Qtrs
Other	`OtherNoncashIncomeExpense`	$-65.00M	USD	3 Qtrs
Other	`OtherNoncashIncomeExpense`	$-65.00M	USD	3 Qtrs
Decrease (increase) in receivables	`IncreaseDecreaseInReceivables`	$202.00M	USD	3 Qtrs
Decrease (increase) in receivables	`IncreaseDecreaseInReceivables`	$202.00M	USD	3 Qtrs
Decrease (increase) in receivables	`IncreaseDecreaseInReceivables`	$-101.00M	USD	3 Qtrs
Decrease (increase) in receivables	`IncreaseDecreaseInReceivables`	$-101.00M	USD	3 Qtrs
(Increase) decrease in inventories	`IncreaseDecreaseInInventories`	$-79.00M	USD	3 Qtrs
(Increase) decrease in inventories	`IncreaseDecreaseInInventories`	$-79.00M	USD	3 Qtrs
(Increase) decrease in inventories	`IncreaseDecreaseInInventories`	$61.00M	USD	3 Qtrs
(Increase) decrease in inventories	`IncreaseDecreaseInInventories`	$61.00M	USD	3 Qtrs
Decrease (increase) in prepaid expenses and other current assets	`IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets`	$12.00M	USD	3 Qtrs
Decrease (increase) in prepaid expenses and other current assets	`IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets`	$12.00M	USD	3 Qtrs
Decrease (increase) in prepaid expenses and other current assets	`IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets`	$-127.00M	USD	3 Qtrs
Decrease (increase) in prepaid expenses and other current assets	`IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets`	$-127.00M	USD	3 Qtrs
Decrease in accounts payable, trade	`IncreaseDecreaseInAccountsPayableTrade`	$-149.00M	USD	3 Qtrs
Decrease in accounts payable, trade	`IncreaseDecreaseInAccountsPayableTrade`	$-149.00M	USD	3 Qtrs
Decrease in accounts payable, trade	`IncreaseDecreaseInAccountsPayableTrade`	$-260.00M	USD	3 Qtrs
Decrease in accounts payable, trade	`IncreaseDecreaseInAccountsPayableTrade`	$-260.00M	USD	3 Qtrs
Decrease in accrued expenses	`IncreaseDecreaseInAccruedLiabilities`	$-88.00M	USD	3 Qtrs
Decrease in accrued expenses	`IncreaseDecreaseInAccruedLiabilities`	$-88.00M	USD	3 Qtrs
Decrease in accrued expenses	`IncreaseDecreaseInAccruedLiabilities`	$-237.00M	USD	3 Qtrs
Decrease in accrued expenses	`IncreaseDecreaseInAccruedLiabilities`	$-237.00M	USD	3 Qtrs
increase in taxes, including income taxes	`IncreaseDecreaseInAccruedTaxesPayable`	$55.00M	USD	3 Qtrs
increase in taxes, including income taxes	`IncreaseDecreaseInAccruedTaxesPayable`	$55.00M	USD	3 Qtrs
increase in taxes, including income taxes	`IncreaseDecreaseInAccruedTaxesPayable`	$86.00M	USD	3 Qtrs
increase in taxes, including income taxes	`IncreaseDecreaseInAccruedTaxesPayable`	$86.00M	USD	3 Qtrs
Pension contributions (L)	`PensionContributions`	$14.00M	USD	3 Qtrs
Pension contributions (L)	`PensionContributions`	$14.00M	USD	3 Qtrs
Pension contributions (L)	`PensionContributions`	$16.00M	USD	3 Qtrs
Pension contributions (L)	`PensionContributions`	$16.00M	USD	3 Qtrs
Increase in noncurrent assets	`IncreaseDecreaseInOtherNoncurrentAssets`	$4.00M	USD	3 Qtrs
Increase in noncurrent assets	`IncreaseDecreaseInOtherNoncurrentAssets`	$4.00M	USD	3 Qtrs
Increase in noncurrent assets	`IncreaseDecreaseInOtherNoncurrentAssets`	$91.00M	USD	3 Qtrs
Increase in noncurrent assets	`IncreaseDecreaseInOtherNoncurrentAssets`	$91.00M	USD	3 Qtrs
Decrease in noncurrent liabilities	`IncreaseDecreaseInOtherNoncurrentLiabilities`	$-113.00M	USD	3 Qtrs
Decrease in noncurrent liabilities	`IncreaseDecreaseInOtherNoncurrentLiabilities`	$-113.00M	USD	3 Qtrs
Decrease in noncurrent liabilities	`IncreaseDecreaseInOtherNoncurrentLiabilities`	$-91.00M	USD	3 Qtrs
Decrease in noncurrent liabilities	`IncreaseDecreaseInOtherNoncurrentLiabilities`	$-91.00M	USD	3 Qtrs
CASH PROVIDED FROM OPERATIONS	`NetCashProvidedByUsedInOperatingActivities`	$207.00M	USD	3 Qtrs
CASH PROVIDED FROM OPERATIONS	`NetCashProvidedByUsedInOperatingActivities`	$207.00M	USD	3 Qtrs
CASH PROVIDED FROM OPERATIONS	`NetCashProvidedByUsedInOperatingActivities`	$648.00M	USD	3 Qtrs
CASH PROVIDED FROM OPERATIONS	`NetCashProvidedByUsedInOperatingActivities`	$648.00M	USD	3 Qtrs
Additions to debt (K)	`AdditionsToLongTermDebtIssuedLessIssuanceDiscount`	$989.00M	USD	3 Qtrs
Additions to debt (K)	`AdditionsToLongTermDebtIssuedLessIssuanceDiscount`	$989.00M	USD	3 Qtrs
Additions to debt (K)	`AdditionsToLongTermDebtIssuedLessIssuanceDiscount`	$1.04B	USD	3 Qtrs
Additions to debt (K)	`AdditionsToLongTermDebtIssuedLessIssuanceDiscount`	$1.04B	USD	3 Qtrs
Payments on debt (K)	`RepaymentsOfLongTermDebt`	$285.00M	USD	3 Qtrs
Payments on debt (K)	`RepaymentsOfLongTermDebt`	$285.00M	USD	3 Qtrs
Payments on debt (K)	`RepaymentsOfLongTermDebt`	$1.07B	USD	3 Qtrs
Payments on debt (K)	`RepaymentsOfLongTermDebt`	$1.07B	USD	3 Qtrs
Dividends paid on Alcoa preferred stock	`PaymentsOfDividendsPreferredStockAndPreferenceStock`	-	USD	3 Qtrs
Dividends paid on Alcoa preferred stock	`PaymentsOfDividendsPreferredStockAndPreferenceStock`	-	USD	3 Qtrs
Dividends paid on Alcoa preferred stock	`PaymentsOfDividendsPreferredStockAndPreferenceStock`	$1.00M	USD	3 Qtrs
Dividends paid on Alcoa preferred stock	`PaymentsOfDividendsPreferredStockAndPreferenceStock`	$1.00M	USD	3 Qtrs
Dividends paid on Alcoa common stock	`PaymentsOfDividendsCommonStock`	$63.00M	USD	3 Qtrs
Dividends paid on Alcoa common stock	`PaymentsOfDividendsCommonStock`	$63.00M	USD	3 Qtrs
Dividends paid on Alcoa common stock	`PaymentsOfDividendsCommonStock`	$78.00M	USD	3 Qtrs
Dividends paid on Alcoa common stock	`PaymentsOfDividendsCommonStock`	$78.00M	USD	3 Qtrs
Payments related to tax withholding on stock-based compensation awards	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$15.00M	USD	3 Qtrs
Payments related to tax withholding on stock-based compensation awards	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$15.00M	USD	3 Qtrs
Payments related to tax withholding on stock-based compensation awards	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$5.00M	USD	3 Qtrs
Payments related to tax withholding on stock-based compensation awards	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$5.00M	USD	3 Qtrs
Financial contributions for the divestiture of businesses (C)	`PaymentsForFinancialContributionsForTheDivestitureOfBusinesses`	$19.00M	USD	3 Qtrs
Financial contributions for the divestiture of businesses (C)	`PaymentsForFinancialContributionsForTheDivestitureOfBusinesses`	$19.00M	USD	3 Qtrs
Financial contributions for the divestiture of businesses (C)	`PaymentsForFinancialContributionsForTheDivestitureOfBusinesses`	$6.00M	USD	3 Qtrs
Financial contributions for the divestiture of businesses (C)	`PaymentsForFinancialContributionsForTheDivestitureOfBusinesses`	$6.00M	USD	3 Qtrs
Contributions from noncontrolling interest (C)	`ProceedsFromMinorityShareholders`	$65.00M	USD	3 Qtrs
Contributions from noncontrolling interest (C)	`ProceedsFromMinorityShareholders`	$65.00M	USD	3 Qtrs
Contributions from noncontrolling interest (C)	`ProceedsFromMinorityShareholders`	$27.00M	USD	3 Qtrs
Contributions from noncontrolling interest (C)	`ProceedsFromMinorityShareholders`	$27.00M	USD	3 Qtrs
Distributions to noncontrolling interest	`PaymentsOfDividendsMinorityInterest`	$49.00M	USD	3 Qtrs
Distributions to noncontrolling interest	`PaymentsOfDividendsMinorityInterest`	$49.00M	USD	3 Qtrs
Distributions to noncontrolling interest	`PaymentsOfDividendsMinorityInterest`	-	USD	3 Qtrs
Distributions to noncontrolling interest	`PaymentsOfDividendsMinorityInterest`	-	USD	3 Qtrs
Acquisition of noncontrolling interest (C)	`PaymentsToAcquireNoncontrollingInterest`	$23.00M	USD	3 Qtrs
Acquisition of noncontrolling interest (C)	`PaymentsToAcquireNoncontrollingInterest`	$23.00M	USD	3 Qtrs
Acquisition of noncontrolling interest (C)	`PaymentsToAcquireNoncontrollingInterest`	-	USD	3 Qtrs
Acquisition of noncontrolling interest (C)	`PaymentsToAcquireNoncontrollingInterest`	-	USD	3 Qtrs
Other	`ProceedsFromPaymentsForOtherFinancingActivities`	$-5.00M	USD	3 Qtrs
Other	`ProceedsFromPaymentsForOtherFinancingActivities`	$-5.00M	USD	3 Qtrs
Other	`ProceedsFromPaymentsForOtherFinancingActivities`	$-3.00M	USD	3 Qtrs
Other	`ProceedsFromPaymentsForOtherFinancingActivities`	$-3.00M	USD	3 Qtrs
CASH (USED FOR) PROVIDED FROM FINANCING ACTIVITIES	`NetCashProvidedByUsedInFinancingActivities`	$595.00M	USD	3 Qtrs
CASH (USED FOR) PROVIDED FROM FINANCING ACTIVITIES	`NetCashProvidedByUsedInFinancingActivities`	$595.00M	USD	3 Qtrs
CASH (USED FOR) PROVIDED FROM FINANCING ACTIVITIES	`NetCashProvidedByUsedInFinancingActivities`	$-95.00M	USD	3 Qtrs
CASH (USED FOR) PROVIDED FROM FINANCING ACTIVITIES	`NetCashProvidedByUsedInFinancingActivities`	$-95.00M	USD	3 Qtrs
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$411.00M	USD	3 Qtrs
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$411.00M	USD	3 Qtrs
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$375.00M	USD	3 Qtrs
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$375.00M	USD	3 Qtrs
Proceeds from the sale of assets	`ProceedsFromSaleOfPropertyPlantAndEquipment`	$2.00M	USD	3 Qtrs
Proceeds from the sale of assets	`ProceedsFromSaleOfPropertyPlantAndEquipment`	$2.00M	USD	3 Qtrs
Proceeds from the sale of assets	`ProceedsFromSaleOfPropertyPlantAndEquipment`	$3.00M	USD	3 Qtrs
Proceeds from the sale of assets	`ProceedsFromSaleOfPropertyPlantAndEquipment`	$3.00M	USD	3 Qtrs
Additions to investments	`PaymentsToAcquireInvestments`	$30.00M	USD	3 Qtrs
Additions to investments	`PaymentsToAcquireInvestments`	$30.00M	USD	3 Qtrs
Additions to investments	`PaymentsToAcquireInvestments`	$42.00M	USD	3 Qtrs
Additions to investments	`PaymentsToAcquireInvestments`	$42.00M	USD	3 Qtrs
Sale of investments	`ProceedsFromSaleOfInvestmentProjects`	-	USD	3 Qtrs
Sale of investments	`ProceedsFromSaleOfInvestmentProjects`	-	USD	3 Qtrs
Sale of investments	`ProceedsFromSaleOfInvestmentProjects`	$11.00M	USD	1 Quarter
Sale of investments	`ProceedsFromSaleOfInvestmentProjects`	$11.00M	USD	1 Quarter
Sale of investments	`ProceedsFromSaleOfInvestmentProjects`	$161.00M	USD	3 Qtrs
Sale of investments	`ProceedsFromSaleOfInvestmentProjects`	$161.00M	USD	3 Qtrs
Other	`PaymentsForProceedsFromOtherInvestingActivities`	$-5.00M	USD	3 Qtrs
Other	`PaymentsForProceedsFromOtherInvestingActivities`	$-5.00M	USD	3 Qtrs
Other	`PaymentsForProceedsFromOtherInvestingActivities`	$-2.00M	USD	3 Qtrs
Other	`PaymentsForProceedsFromOtherInvestingActivities`	$-2.00M	USD	3 Qtrs
CASH USED FOR INVESTING ACTIVITIES	`NetCashProvidedByUsedInInvestingActivities`	$-434.00M	USD	3 Qtrs
CASH USED FOR INVESTING ACTIVITIES	`NetCashProvidedByUsedInInvestingActivities`	$-434.00M	USD	3 Qtrs
CASH USED FOR INVESTING ACTIVITIES	`NetCashProvidedByUsedInInvestingActivities`	$-251.00M	USD	3 Qtrs
CASH USED FOR INVESTING ACTIVITIES	`NetCashProvidedByUsedInInvestingActivities`	$-251.00M	USD	3 Qtrs
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS AND RESTRICTED CASH	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-5.00M	USD	3 Qtrs
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS AND RESTRICTED CASH	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-5.00M	USD	3 Qtrs
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS AND RESTRICTED CASH	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$38.00M	USD	3 Qtrs
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS AND RESTRICTED CASH	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$38.00M	USD	3 Qtrs
Net change in cash and cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$363.00M	USD	3 Qtrs
Net change in cash and cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$363.00M	USD	3 Qtrs
Net change in cash and cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$340.00M	USD	3 Qtrs
Net change in cash and cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$340.00M	USD	3 Qtrs
Cash and cash equivalents and restricted cash at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.05B	USD	Point-in-time
Cash and cash equivalents and restricted cash at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.05B	USD	Point-in-time
Cash and cash equivalents and restricted cash at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.41B	USD	Point-in-time
Cash and cash equivalents and restricted cash at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.41B	USD	Point-in-time
Cash and cash equivalents and restricted cash at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.23B	USD	Point-in-time
Cash and cash equivalents and restricted cash at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.23B	USD	Point-in-time
Cash and cash equivalents and restricted cash at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.57B	USD	Point-in-time
Cash and cash equivalents and restricted cash at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.57B	USD	Point-in-time
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.05B	USD	Point-in-time
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.05B	USD	Point-in-time
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.41B	USD	Point-in-time
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.41B	USD	Point-in-time
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.23B	USD	Point-in-time
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.23B	USD	Point-in-time
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.57B	USD	Point-in-time
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.57B	USD	Point-in-time

Stockholders Equity 144 line items

Line Item	Tag	Value	Unit	Period
Preferred stock dividends per share	`PreferredStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Preferred stock dividends per share	`PreferredStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Preferred stock dividends per share	`PreferredStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Preferred stock dividends per share	`PreferredStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Preferred stock dividends per share	`PreferredStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Preferred stock dividends per share	`PreferredStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Preferred stock dividends per share	`PreferredStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Preferred stock dividends per share	`PreferredStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Common stock dividends per share	`CommonStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Common stock dividends per share	`CommonStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Common stock dividends per share	`CommonStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Common stock dividends per share	`CommonStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Common stock dividends per share	`CommonStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Common stock dividends per share	`CommonStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Common stock dividends per share	`CommonStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Common stock dividends per share	`CommonStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Common stock dividends per share	`CommonStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Common stock dividends per share	`CommonStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Common stock dividends per share	`CommonStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Common stock dividends per share	`CommonStockDividendsPerShareCashPaid`	$0.10	USD	1 Quarter
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.84B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.84B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.53B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.53B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.42B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.42B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.25B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.25B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.16B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.16B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.82B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.82B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.13B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.13B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.34B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.34B	USD	Point-in-time
Balance	`RedeemableNoncontrollingInterestEquityCarryingAmount`	-	USD	Point-in-time
Balance	`RedeemableNoncontrollingInterestEquityCarryingAmount`	-	USD	Point-in-time
Balance	`RedeemableNoncontrollingInterestEquityCarryingAmount`	$86.00M	USD	Point-in-time
Balance	`RedeemableNoncontrollingInterestEquityCarryingAmount`	$86.00M	USD	Point-in-time
Net (loss) income	`NetIncomeLossIncludingPortionAttributableToMezzanineEquityAndNon-ControllingInterest`	$-307.00M	USD	1 Quarter
Net (loss) income	`NetIncomeLossIncludingPortionAttributableToMezzanineEquityAndNon-ControllingInterest`	$-307.00M	USD	1 Quarter
Net (loss) income	`NetIncomeLossIncludingPortionAttributableToMezzanineEquityAndNon-ControllingInterest`	$31.00M	USD	1 Quarter
Net (loss) income	`NetIncomeLossIncludingPortionAttributableToMezzanineEquityAndNon-ControllingInterest`	$31.00M	USD	1 Quarter
Net (loss) income	`NetIncomeLossIncludingPortionAttributableToMezzanineEquityAndNon-ControllingInterest`	$98.00M	USD	1 Quarter
Net (loss) income	`NetIncomeLossIncludingPortionAttributableToMezzanineEquityAndNon-ControllingInterest`	$98.00M	USD	1 Quarter
Net (loss) income	`NetIncomeLossIncludingPortionAttributableToMezzanineEquityAndNon-ControllingInterest`	$548.00M	USD	1 Quarter
Net (loss) income	`NetIncomeLossIncludingPortionAttributableToMezzanineEquityAndNon-ControllingInterest`	$548.00M	USD	1 Quarter
Net (loss) income	`NetIncomeLossIncludingPortionAttributableToMezzanineEquityAndNon-ControllingInterest`	$164.00M	USD	1 Quarter
Net (loss) income	`NetIncomeLossIncludingPortionAttributableToMezzanineEquityAndNon-ControllingInterest`	$164.00M	USD	1 Quarter
Net (loss) income	`NetIncomeLossIncludingPortionAttributableToMezzanineEquityAndNon-ControllingInterest`	$232.00M	USD	1 Quarter
Net (loss) income	`NetIncomeLossIncludingPortionAttributableToMezzanineEquityAndNon-ControllingInterest`	$232.00M	USD	1 Quarter
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$-36.00M	USD	1 Quarter
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$-36.00M	USD	1 Quarter
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$-121.00M	USD	1 Quarter
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$-121.00M	USD	1 Quarter
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$58.00M	USD	1 Quarter
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$58.00M	USD	1 Quarter
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$-99.00M	USD	3 Qtrs
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$-99.00M	USD	3 Qtrs
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$206.00M	USD	1 Quarter
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$206.00M	USD	1 Quarter
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$-6.00M	USD	1 Quarter
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$-6.00M	USD	1 Quarter
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$381.00M	USD	3 Qtrs
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$381.00M	USD	3 Qtrs
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$94.00M	USD	1 Quarter
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$94.00M	USD	1 Quarter
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$2.00M	USD	3 Qtrs
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$2.00M	USD	3 Qtrs
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$171.00M	USD	1 Quarter
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$171.00M	USD	1 Quarter
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-6.00M	USD	1 Quarter
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-6.00M	USD	1 Quarter
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$371.00M	USD	3 Qtrs
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$371.00M	USD	3 Qtrs
Stock-based compensation	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$10.00M	USD	1 Quarter
Stock-based compensation	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$10.00M	USD	1 Quarter
Stock-based compensation	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$12.00M	USD	1 Quarter
Stock-based compensation	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$12.00M	USD	1 Quarter
Stock-based compensation	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$9.00M	USD	1 Quarter
Stock-based compensation	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$9.00M	USD	1 Quarter
Stock-based compensation	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$11.00M	USD	1 Quarter
Stock-based compensation	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$11.00M	USD	1 Quarter
Stock-based compensation	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$12.00M	USD	1 Quarter
Stock-based compensation	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$12.00M	USD	1 Quarter
Stock-based compensation	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$10.00M	USD	1 Quarter
Stock-based compensation	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$10.00M	USD	1 Quarter
Net effect of tax withholding for compensation plans and exercise of stock options	`NetEffectOfTaxWithholdingShareBasedCompensationArrangementAndStockOptionsExercised`	$-15.00M	USD	1 Quarter
Net effect of tax withholding for compensation plans and exercise of stock options	`NetEffectOfTaxWithholdingShareBasedCompensationArrangementAndStockOptionsExercised`	$-15.00M	USD	1 Quarter
Net effect of tax withholding for compensation plans and exercise of stock options	`NetEffectOfTaxWithholdingShareBasedCompensationArrangementAndStockOptionsExercised`	$-5.00M	USD	1 Quarter
Net effect of tax withholding for compensation plans and exercise of stock options	`NetEffectOfTaxWithholdingShareBasedCompensationArrangementAndStockOptionsExercised`	$-5.00M	USD	1 Quarter
Dividends paid on Alcoa preferred stock ($0.10 per share)	`DividendsPreferredStock`	$1.00M	USD	1 Quarter
Dividends paid on Alcoa preferred stock ($0.10 per share)	`DividendsPreferredStock`	$1.00M	USD	1 Quarter
Dividends paid on Alcoa preferred stock ($0.10 per share)	`DividendsPreferredStock`	$1.00M	USD	3 Qtrs
Dividends paid on Alcoa preferred stock ($0.10 per share)	`DividendsPreferredStock`	$1.00M	USD	3 Qtrs
Dividends paid on Alcoa common stock ($0.10 per share)	`DividendsCommonStock`	$19.00M	USD	1 Quarter
Dividends paid on Alcoa common stock ($0.10 per share)	`DividendsCommonStock`	$19.00M	USD	1 Quarter
Dividends paid on Alcoa common stock ($0.10 per share)	`DividendsCommonStock`	$18.00M	USD	1 Quarter
Dividends paid on Alcoa common stock ($0.10 per share)	`DividendsCommonStock`	$18.00M	USD	1 Quarter
Dividends paid on Alcoa common stock ($0.10 per share)	`DividendsCommonStock`	$26.00M	USD	1 Quarter
Dividends paid on Alcoa common stock ($0.10 per share)	`DividendsCommonStock`	$26.00M	USD	1 Quarter
Dividends paid on Alcoa common stock ($0.10 per share)	`DividendsCommonStock`	$26.00M	USD	1 Quarter
Dividends paid on Alcoa common stock ($0.10 per share)	`DividendsCommonStock`	$26.00M	USD	1 Quarter
Dividends paid on Alcoa common stock ($0.10 per share)	`DividendsCommonStock`	$26.00M	USD	1 Quarter
Dividends paid on Alcoa common stock ($0.10 per share)	`DividendsCommonStock`	$26.00M	USD	1 Quarter
Dividends paid on Alcoa common stock ($0.10 per share)	`DividendsCommonStock`	$26.00M	USD	1 Quarter
Dividends paid on Alcoa common stock ($0.10 per share)	`DividendsCommonStock`	$26.00M	USD	1 Quarter
Contributions	`MinorityInterestIncreaseDecreaseFromCapitalContributionFromNoncontrollingInterestHolders`	$61.00M	USD	1 Quarter
Contributions	`MinorityInterestIncreaseDecreaseFromCapitalContributionFromNoncontrollingInterestHolders`	$61.00M	USD	1 Quarter
Contributions	`MinorityInterestIncreaseDecreaseFromCapitalContributionFromNoncontrollingInterestHolders`	$4.00M	USD	1 Quarter
Contributions	`MinorityInterestIncreaseDecreaseFromCapitalContributionFromNoncontrollingInterestHolders`	$4.00M	USD	1 Quarter
Distributions	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$6.00M	USD	1 Quarter
Distributions	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$6.00M	USD	1 Quarter
Distributions	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$26.00M	USD	1 Quarter
Distributions	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$26.00M	USD	1 Quarter
Distributions	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$17.00M	USD	1 Quarter
Distributions	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$17.00M	USD	1 Quarter
Acquisition of noncontrolling interest (C)	`AcquisitionOfNoncontrollingInterest`	$-288.00M	USD	1 Quarter
Acquisition of noncontrolling interest (C)	`AcquisitionOfNoncontrollingInterest`	$-288.00M	USD	1 Quarter
Joint venture formation (C)	`JointVentureFormation`	$-76.00M	USD	1 Quarter
Joint venture formation (C)	`JointVentureFormation`	$-76.00M	USD	1 Quarter
Other	`StockholdersEquityOther`	$1.00M	USD	1 Quarter
Other	`StockholdersEquityOther`	$1.00M	USD	1 Quarter
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.84B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.84B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.53B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.53B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.42B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.42B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.25B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.25B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.16B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.16B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.82B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.82B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.13B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.13B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.34B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.34B	USD	Point-in-time
Balance	`RedeemableNoncontrollingInterestEquityCarryingAmount`	-	USD	Point-in-time
Balance	`RedeemableNoncontrollingInterestEquityCarryingAmount`	-	USD	Point-in-time
Balance	`RedeemableNoncontrollingInterestEquityCarryingAmount`	$86.00M	USD	Point-in-time
Balance	`RedeemableNoncontrollingInterestEquityCarryingAmount`	$86.00M	USD	Point-in-time

Comprehensive Income 152 line items

Line Item	Tag	Value	Unit	Period
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	`NetIncomeLoss`	$90.00M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	`NetIncomeLoss`	$90.00M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	`NetIncomeLoss`	$-142.00M	USD	3 Qtrs
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	`NetIncomeLoss`	$-142.00M	USD	3 Qtrs
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	`NetIncomeLoss`	$232.00M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	`NetIncomeLoss`	$232.00M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	`NetIncomeLoss`	$944.00M	USD	3 Qtrs
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	`NetIncomeLoss`	$944.00M	USD	3 Qtrs
Net income (loss), Noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$8.00M	USD	1 Quarter
Net income (loss), Noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$8.00M	USD	1 Quarter
Net income (loss), Noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-36.00M	USD	3 Qtrs
Net income (loss), Noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-36.00M	USD	3 Qtrs
Net income (loss), Noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-14.00M	USD	1 Quarter
Net income (loss), Noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-14.00M	USD	1 Quarter
Net income (loss), Noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-27.00M	USD	3 Qtrs
Net income (loss), Noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-27.00M	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$98.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$98.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$-178.00M	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$-178.00M	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$218.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$218.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$917.00M	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$917.00M	USD	3 Qtrs
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Alcoa Corporation	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent`	$1.00M	USD	1 Quarter
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Alcoa Corporation	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent`	$1.00M	USD	1 Quarter
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Alcoa Corporation	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent`	$23.00M	USD	3 Qtrs
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Alcoa Corporation	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent`	$23.00M	USD	3 Qtrs
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Alcoa Corporation	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent`	$7.00M	USD	1 Quarter
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Alcoa Corporation	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent`	$7.00M	USD	1 Quarter
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Alcoa Corporation	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent`	$23.00M	USD	3 Qtrs
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Alcoa Corporation	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent`	$23.00M	USD	3 Qtrs
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Noncontrolling interest	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$-2.00M	USD	1 Quarter
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Noncontrolling interest	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$-2.00M	USD	1 Quarter
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Noncontrolling interest	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$4.00M	USD	3 Qtrs
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Noncontrolling interest	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$4.00M	USD	3 Qtrs
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Noncontrolling interest	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	1 Quarter
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Noncontrolling interest	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	1 Quarter
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Noncontrolling interest	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	3 Qtrs
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Noncontrolling interest	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	3 Qtrs
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-1.00M	USD	1 Quarter
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-1.00M	USD	1 Quarter
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$27.00M	USD	3 Qtrs
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$27.00M	USD	3 Qtrs
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$7.00M	USD	1 Quarter
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$7.00M	USD	1 Quarter
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$23.00M	USD	3 Qtrs
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$23.00M	USD	3 Qtrs
Foreign currency translation adjustments, Alcoa Corporation	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent`	$144.00M	USD	1 Quarter
Foreign currency translation adjustments, Alcoa Corporation	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent`	$144.00M	USD	1 Quarter
Foreign currency translation adjustments, Alcoa Corporation	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent`	$-38.00M	USD	3 Qtrs
Foreign currency translation adjustments, Alcoa Corporation	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent`	$-38.00M	USD	3 Qtrs
Foreign currency translation adjustments, Alcoa Corporation	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent`	$87.00M	USD	1 Quarter
Foreign currency translation adjustments, Alcoa Corporation	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent`	$87.00M	USD	1 Quarter
Foreign currency translation adjustments, Alcoa Corporation	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent`	$479.00M	USD	3 Qtrs
Foreign currency translation adjustments, Alcoa Corporation	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent`	$479.00M	USD	3 Qtrs
Foreign currency translation adjustments, Noncontrolling interest	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$-35.00M	USD	1 Quarter
Foreign currency translation adjustments, Noncontrolling interest	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$-35.00M	USD	1 Quarter
Foreign currency translation adjustments, Noncontrolling interest	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$-105.00M	USD	3 Qtrs
Foreign currency translation adjustments, Noncontrolling interest	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$-105.00M	USD	3 Qtrs
Foreign currency translation adjustments, Noncontrolling interest	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	1 Quarter
Foreign currency translation adjustments, Noncontrolling interest	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	1 Quarter
Foreign currency translation adjustments, Noncontrolling interest	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$10.00M	USD	3 Qtrs
Foreign currency translation adjustments, Noncontrolling interest	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$10.00M	USD	3 Qtrs
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$109.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$109.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-143.00M	USD	3 Qtrs
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-143.00M	USD	3 Qtrs
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$87.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$87.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$489.00M	USD	3 Qtrs
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$489.00M	USD	3 Qtrs
Net change in unrecognized gains/losses on cash flow hedges, Alcoa Corporation	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent`	$-51.00M	USD	1 Quarter
Net change in unrecognized gains/losses on cash flow hedges, Alcoa Corporation	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent`	$-51.00M	USD	1 Quarter
Net change in unrecognized gains/losses on cash flow hedges, Alcoa Corporation	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent`	$17.00M	USD	3 Qtrs
Net change in unrecognized gains/losses on cash flow hedges, Alcoa Corporation	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent`	$17.00M	USD	3 Qtrs
Net change in unrecognized gains/losses on cash flow hedges, Alcoa Corporation	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent`	$-100.00M	USD	1 Quarter
Net change in unrecognized gains/losses on cash flow hedges, Alcoa Corporation	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent`	$-100.00M	USD	1 Quarter
Net change in unrecognized gains/losses on cash flow hedges, Alcoa Corporation	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent`	$-131.00M	USD	3 Qtrs
Net change in unrecognized gains/losses on cash flow hedges, Alcoa Corporation	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent`	$-131.00M	USD	3 Qtrs
Net change in unrecognized gains/losses on cash flow hedges, Noncontrolling interest	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxNoncontrollingInterest`	$1.00M	USD	1 Quarter
Net change in unrecognized gains/losses on cash flow hedges, Noncontrolling interest	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxNoncontrollingInterest`	$1.00M	USD	1 Quarter
Net change in unrecognized gains/losses on cash flow hedges, Noncontrolling interest	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxNoncontrollingInterest`	-	USD	3 Qtrs
Net change in unrecognized gains/losses on cash flow hedges, Noncontrolling interest	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxNoncontrollingInterest`	-	USD	3 Qtrs
Net change in unrecognized gains/losses on cash flow hedges, Noncontrolling interest	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxNoncontrollingInterest`	-	USD	1 Quarter
Net change in unrecognized gains/losses on cash flow hedges, Noncontrolling interest	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxNoncontrollingInterest`	-	USD	1 Quarter
Net change in unrecognized gains/losses on cash flow hedges, Noncontrolling interest	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxNoncontrollingInterest`	-	USD	3 Qtrs
Net change in unrecognized gains/losses on cash flow hedges, Noncontrolling interest	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxNoncontrollingInterest`	-	USD	3 Qtrs
Net change in unrecognized gains/losses on cash flow hedges	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax`	$-50.00M	USD	1 Quarter
Net change in unrecognized gains/losses on cash flow hedges	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax`	$-50.00M	USD	1 Quarter
Net change in unrecognized gains/losses on cash flow hedges	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax`	$17.00M	USD	3 Qtrs
Net change in unrecognized gains/losses on cash flow hedges	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax`	$17.00M	USD	3 Qtrs
Net change in unrecognized gains/losses on cash flow hedges	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax`	$-100.00M	USD	1 Quarter
Net change in unrecognized gains/losses on cash flow hedges	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax`	$-100.00M	USD	1 Quarter
Net change in unrecognized gains/losses on cash flow hedges	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax`	$-131.00M	USD	3 Qtrs
Net change in unrecognized gains/losses on cash flow hedges	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax`	$-131.00M	USD	3 Qtrs
Total Other comprehensive income (loss), net of tax, Alcoa Corporation	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$94.00M	USD	1 Quarter
Total Other comprehensive income (loss), net of tax, Alcoa Corporation	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$94.00M	USD	1 Quarter
Total Other comprehensive income (loss), net of tax, Alcoa Corporation	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$2.00M	USD	3 Qtrs
Total Other comprehensive income (loss), net of tax, Alcoa Corporation	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$2.00M	USD	3 Qtrs
Total Other comprehensive income (loss), net of tax, Alcoa Corporation	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$171.00M	USD	1 Quarter
Total Other comprehensive income (loss), net of tax, Alcoa Corporation	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$171.00M	USD	1 Quarter
Total Other comprehensive income (loss), net of tax, Alcoa Corporation	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-6.00M	USD	1 Quarter
Total Other comprehensive income (loss), net of tax, Alcoa Corporation	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-6.00M	USD	1 Quarter
Total Other comprehensive income (loss), net of tax, Alcoa Corporation	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$371.00M	USD	3 Qtrs
Total Other comprehensive income (loss), net of tax, Alcoa Corporation	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$371.00M	USD	3 Qtrs
Total Other comprehensive income (loss), net of tax, Noncontrolling interest	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$-36.00M	USD	1 Quarter
Total Other comprehensive income (loss), net of tax, Noncontrolling interest	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$-36.00M	USD	1 Quarter
Total Other comprehensive income (loss), net of tax, Noncontrolling interest	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$-101.00M	USD	3 Qtrs
Total Other comprehensive income (loss), net of tax, Noncontrolling interest	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$-101.00M	USD	3 Qtrs
Total Other comprehensive income (loss), net of tax, Noncontrolling interest	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	1 Quarter
Total Other comprehensive income (loss), net of tax, Noncontrolling interest	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	1 Quarter
Total Other comprehensive income (loss), net of tax, Noncontrolling interest	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$10.00M	USD	3 Qtrs
Total Other comprehensive income (loss), net of tax, Noncontrolling interest	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$10.00M	USD	3 Qtrs
Total Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$-36.00M	USD	1 Quarter
Total Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$-36.00M	USD	1 Quarter
Total Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$-121.00M	USD	1 Quarter
Total Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$-121.00M	USD	1 Quarter
Total Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$58.00M	USD	1 Quarter
Total Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$58.00M	USD	1 Quarter
Total Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$-99.00M	USD	3 Qtrs
Total Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$-99.00M	USD	3 Qtrs
Total Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$206.00M	USD	1 Quarter
Total Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$206.00M	USD	1 Quarter
Total Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$-6.00M	USD	1 Quarter
Total Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$-6.00M	USD	1 Quarter
Total Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$381.00M	USD	3 Qtrs
Total Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$381.00M	USD	3 Qtrs
Comprehensive income (loss), Alcoa Corporation	`ComprehensiveIncomeNetOfTax`	$184.00M	USD	1 Quarter
Comprehensive income (loss), Alcoa Corporation	`ComprehensiveIncomeNetOfTax`	$184.00M	USD	1 Quarter
Comprehensive income (loss), Alcoa Corporation	`ComprehensiveIncomeNetOfTax`	$-140.00M	USD	3 Qtrs
Comprehensive income (loss), Alcoa Corporation	`ComprehensiveIncomeNetOfTax`	$-140.00M	USD	3 Qtrs
Comprehensive income (loss), Alcoa Corporation	`ComprehensiveIncomeNetOfTax`	$226.00M	USD	1 Quarter
Comprehensive income (loss), Alcoa Corporation	`ComprehensiveIncomeNetOfTax`	$226.00M	USD	1 Quarter
Comprehensive income (loss), Alcoa Corporation	`ComprehensiveIncomeNetOfTax`	$1.31B	USD	3 Qtrs
Comprehensive income (loss), Alcoa Corporation	`ComprehensiveIncomeNetOfTax`	$1.31B	USD	3 Qtrs
Comprehensive income (loss), Noncontrolling interest	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-28.00M	USD	1 Quarter
Comprehensive income (loss), Noncontrolling interest	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-28.00M	USD	1 Quarter
Comprehensive income (loss), Noncontrolling interest	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-137.00M	USD	3 Qtrs
Comprehensive income (loss), Noncontrolling interest	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-137.00M	USD	3 Qtrs
Comprehensive income (loss), Noncontrolling interest	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-14.00M	USD	1 Quarter
Comprehensive income (loss), Noncontrolling interest	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-14.00M	USD	1 Quarter
Comprehensive income (loss), Noncontrolling interest	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-17.00M	USD	3 Qtrs
Comprehensive income (loss), Noncontrolling interest	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-17.00M	USD	3 Qtrs
Comprehensive income (loss)	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$156.00M	USD	1 Quarter
Comprehensive income (loss)	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$156.00M	USD	1 Quarter
Comprehensive income (loss)	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$-277.00M	USD	3 Qtrs
Comprehensive income (loss)	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$-277.00M	USD	3 Qtrs
Comprehensive income (loss)	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$212.00M	USD	1 Quarter
Comprehensive income (loss)	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$212.00M	USD	1 Quarter
Comprehensive income (loss)	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$1.30B	USD	3 Qtrs
Comprehensive income (loss)	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$1.30B	USD	3 Qtrs

Data is extracted from SEC EDGAR XBRL filings. Values shown are as reported in the filing.