10-K Filing

ALCOA CORP CIK: 1675149 FY 2024

Filing Information

Form Type	10-K
Accession Number	`0000950170-25-024242`
Period End Date	20241231
Filing Date	20250220
Fiscal Year	2024
Fiscal Period	FY
XBRL Instance	aa-20241231_htm.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 160 Income Statement 96 Cash Flow Statement 262 Stockholders Equity 78 Comprehensive Income 108

Balance Sheet 160 line items

Line Item	Tag	Value	Unit	Period
Cash and cash equivalents (P)	`CashAndCashEquivalentsAtCarryingValue`	$1.14B	USD	Point-in-time
Cash and cash equivalents (P)	`CashAndCashEquivalentsAtCarryingValue`	$1.14B	USD	Point-in-time
Cash and cash equivalents (P)	`CashAndCashEquivalentsAtCarryingValue`	$944.00M	USD	Point-in-time
Cash and cash equivalents (P)	`CashAndCashEquivalentsAtCarryingValue`	$944.00M	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`	$656.00M	USD	Point-in-time
Receivables from customers (I)	`AccountsReceivableNetCurrent`	$656.00M	USD	Point-in-time
Other receivables	`OtherReceivablesNetCurrent`	$152.00M	USD	Point-in-time
Other receivables	`OtherReceivablesNetCurrent`	$152.00M	USD	Point-in-time
Other receivables	`OtherReceivablesNetCurrent`	$143.00M	USD	Point-in-time
Other receivables	`OtherReceivablesNetCurrent`	$143.00M	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`	$2.16B	USD	Point-in-time
Inventories (J)	`InventoryNet`	$2.16B	USD	Point-in-time
Fair value of derivative instruments (P)	`DerivativeAssetsCurrent`	$25.00M	USD	Point-in-time
Fair value of derivative instruments (P)	`DerivativeAssetsCurrent`	$25.00M	USD	Point-in-time
Fair value of derivative instruments (P)	`DerivativeAssetsCurrent`	$29.00M	USD	Point-in-time
Fair value of derivative instruments (P)	`DerivativeAssetsCurrent`	$29.00M	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`	$466.00M	USD	Point-in-time
Prepaid expenses and other current assets	`PrepaidExpenseAndOtherAssetsCurrent`	$466.00M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$4.41B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$4.41B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$4.91B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$4.91B	USD	Point-in-time
Properties, plants, and equipment, net (K)	`PropertyPlantAndEquipmentNet`	$6.79B	USD	Point-in-time
Properties, plants, and equipment, net (K)	`PropertyPlantAndEquipmentNet`	$6.79B	USD	Point-in-time
Properties, plants, and equipment, net (K)	`PropertyPlantAndEquipmentNet`	$6.39B	USD	Point-in-time
Properties, plants, and equipment, net (K)	`PropertyPlantAndEquipmentNet`	$6.39B	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`	$979.00M	USD	Point-in-time
Investments (H)	`InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures`	$979.00M	USD	Point-in-time
Deferred income taxes (Q)	`DeferredIncomeTaxAssetsNet`	$333.00M	USD	Point-in-time
Deferred income taxes (Q)	`DeferredIncomeTaxAssetsNet`	$333.00M	USD	Point-in-time
Deferred income taxes (Q)	`DeferredIncomeTaxAssetsNet`	$284.00M	USD	Point-in-time
Deferred income taxes (Q)	`DeferredIncomeTaxAssetsNet`	$284.00M	USD	Point-in-time
Fair value of derivative instruments (P)	`DerivativeAssetsNoncurrent`	-	USD	Point-in-time
Fair value of derivative instruments (P)	`DerivativeAssetsNoncurrent`	-	USD	Point-in-time
Fair value of derivative instruments (P)	`DerivativeAssetsNoncurrent`	$3.00M	USD	Point-in-time
Fair value of derivative instruments (P)	`DerivativeAssetsNoncurrent`	$3.00M	USD	Point-in-time
Other noncurrent assets (U)	`OtherAssetsNoncurrent`	$1.50B	USD	Point-in-time
Other noncurrent assets (U)	`OtherAssetsNoncurrent`	$1.50B	USD	Point-in-time
Other noncurrent assets (U)	`OtherAssetsNoncurrent`	$1.65B	USD	Point-in-time
Other noncurrent assets (U)	`OtherAssetsNoncurrent`	$1.65B	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`	$14.15B	USD	Point-in-time
Total Assets	`Assets`	$14.15B	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`	$1.71B	USD	Point-in-time
Accounts payable, trade	`AccountsPayableCurrent`	$1.71B	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`	$357.00M	USD	Point-in-time
Accrued compensation and retirement costs	`EmployeeRelatedLiabilitiesCurrent`	$357.00M	USD	Point-in-time
Taxes, including income taxes	`TaxesPayableCurrent`	$88.00M	USD	Point-in-time
Taxes, including income taxes	`TaxesPayableCurrent`	$88.00M	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
Fair value of derivative instruments (P)	`DerivativeLiabilitiesCurrent`	$263.00M	USD	Point-in-time
Fair value of derivative instruments (P)	`DerivativeLiabilitiesCurrent`	$263.00M	USD	Point-in-time
Fair value of derivative instruments (P)	`DerivativeLiabilitiesCurrent`	$214.00M	USD	Point-in-time
Fair value of derivative instruments (P)	`DerivativeLiabilitiesCurrent`	$214.00M	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`	$578.00M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$578.00M	USD	Point-in-time
Long-term debt due within one year (M & P)	`LongTermDebtAndCapitalLeaseObligationsCurrent`	$79.00M	USD	Point-in-time
Long-term debt due within one year (M & P)	`LongTermDebtAndCapitalLeaseObligationsCurrent`	$79.00M	USD	Point-in-time
Long-term debt due within one year (M & P)	`LongTermDebtAndCapitalLeaseObligationsCurrent`	$75.00M	USD	Point-in-time
Long-term debt due within one year (M & P)	`LongTermDebtAndCapitalLeaseObligationsCurrent`	$75.00M	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`	$3.03B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$3.03B	USD	Point-in-time
Long-term debt, less amount due within one year (M & P)	`LongTermDebtAndCapitalLeaseObligations`	$1.73B	USD	Point-in-time
Long-term debt, less amount due within one year (M & P)	`LongTermDebtAndCapitalLeaseObligations`	$1.73B	USD	Point-in-time
Long-term debt, less amount due within one year (M & P)	`LongTermDebtAndCapitalLeaseObligations`	$2.47B	USD	Point-in-time
Long-term debt, less amount due within one year (M & P)	`LongTermDebtAndCapitalLeaseObligations`	$2.47B	USD	Point-in-time
Accrued pension benefits (O)	`DefinedBenefitPensionPlanLiabilitiesNoncurrent`	$278.00M	USD	Point-in-time
Accrued pension benefits (O)	`DefinedBenefitPensionPlanLiabilitiesNoncurrent`	$278.00M	USD	Point-in-time
Accrued pension benefits (O)	`DefinedBenefitPensionPlanLiabilitiesNoncurrent`	$256.00M	USD	Point-in-time
Accrued pension benefits (O)	`DefinedBenefitPensionPlanLiabilitiesNoncurrent`	$256.00M	USD	Point-in-time
Accrued other postretirement benefits (O)	`OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent`	$412.00M	USD	Point-in-time
Accrued other postretirement benefits (O)	`OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent`	$412.00M	USD	Point-in-time
Accrued other postretirement benefits (O)	`OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent`	$443.00M	USD	Point-in-time
Accrued other postretirement benefits (O)	`OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent`	$443.00M	USD	Point-in-time
Asset retirement obligations (R)	`AssetRetirementObligationsNoncurrent`	$691.00M	USD	Point-in-time
Asset retirement obligations (R)	`AssetRetirementObligationsNoncurrent`	$691.00M	USD	Point-in-time
Asset retirement obligations (R)	`AssetRetirementObligationsNoncurrent`	$772.00M	USD	Point-in-time
Asset retirement obligations (R)	`AssetRetirementObligationsNoncurrent`	$772.00M	USD	Point-in-time
Environmental remediation (S)	`AccruedEnvironmentalLossContingenciesNoncurrent`	$182.00M	USD	Point-in-time
Environmental remediation (S)	`AccruedEnvironmentalLossContingenciesNoncurrent`	$182.00M	USD	Point-in-time
Environmental remediation (S)	`AccruedEnvironmentalLossContingenciesNoncurrent`	$202.00M	USD	Point-in-time
Environmental remediation (S)	`AccruedEnvironmentalLossContingenciesNoncurrent`	$202.00M	USD	Point-in-time
Fair value of derivative instruments (P)	`DerivativeLiabilitiesNoncurrent`	$836.00M	USD	Point-in-time
Fair value of derivative instruments (P)	`DerivativeLiabilitiesNoncurrent`	$836.00M	USD	Point-in-time
Fair value of derivative instruments (P)	`DerivativeLiabilitiesNoncurrent`	$1.09B	USD	Point-in-time
Fair value of derivative instruments (P)	`DerivativeLiabilitiesNoncurrent`	$1.09B	USD	Point-in-time
Noncurrent income taxes (Q)	`AccruedIncomeTaxesNoncurrent`	$193.00M	USD	Point-in-time
Noncurrent income taxes (Q)	`AccruedIncomeTaxesNoncurrent`	$193.00M	USD	Point-in-time
Noncurrent income taxes (Q)	`AccruedIncomeTaxesNoncurrent`	$9.00M	USD	Point-in-time
Noncurrent income taxes (Q)	`AccruedIncomeTaxesNoncurrent`	$9.00M	USD	Point-in-time
Other noncurrent liabilities and deferred credits (U)	`DeferredCreditsAndOtherLiabilitiesNoncurrent`	$568.00M	USD	Point-in-time
Other noncurrent liabilities and deferred credits (U)	`DeferredCreditsAndOtherLiabilitiesNoncurrent`	$568.00M	USD	Point-in-time
Other noncurrent liabilities and deferred credits (U)	`DeferredCreditsAndOtherLiabilitiesNoncurrent`	$656.00M	USD	Point-in-time
Other noncurrent liabilities and deferred credits (U)	`DeferredCreditsAndOtherLiabilitiesNoncurrent`	$656.00M	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`	$8.31B	USD	Point-in-time
Total liabilities	`Liabilities`	$8.31B	USD	Point-in-time
Contingencies and commitments (S)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Contingencies and commitments (S)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Contingencies and commitments (S)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Contingencies and commitments (S)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Preferred stock (N)	`PreferredStockValue`	-	USD	Point-in-time
Preferred stock (N)	`PreferredStockValue`	-	USD	Point-in-time
Preferred stock (N)	`PreferredStockValue`	-	USD	Point-in-time
Preferred stock (N)	`PreferredStockValue`	-	USD	Point-in-time
Common stock (N)	`CommonStockValue`	$3.00M	USD	Point-in-time
Common stock (N)	`CommonStockValue`	$3.00M	USD	Point-in-time
Common stock (N)	`CommonStockValue`	$2.00M	USD	Point-in-time
Common stock (N)	`CommonStockValue`	$2.00M	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`	$9.19B	USD	Point-in-time
Additional capital	`AdditionalPaidInCapitalCommonStock`	$9.19B	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`	$-1.29B	USD	Point-in-time
Accumulated deficit	`RetainedEarningsAccumulatedDeficit`	$-1.29B	USD	Point-in-time
Accumulated other comprehensive loss (G)	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-3.65B	USD	Point-in-time
Accumulated other comprehensive loss (G)	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-3.65B	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
Total Alcoa Corporation shareholders equity	`StockholdersEquity`	$4.25B	USD	Point-in-time
Total Alcoa Corporation shareholders equity	`StockholdersEquity`	$4.25B	USD	Point-in-time
Total Alcoa Corporation shareholders equity	`StockholdersEquity`	$5.16B	USD	Point-in-time
Total Alcoa Corporation shareholders equity	`StockholdersEquity`	$5.16B	USD	Point-in-time
Noncontrolling interest (A)	`MinorityInterest`	-	USD	Point-in-time
Noncontrolling interest (A)	`MinorityInterest`	-	USD	Point-in-time
Noncontrolling interest (A)	`MinorityInterest`	$1.59B	USD	Point-in-time
Noncontrolling interest (A)	`MinorityInterest`	$1.59B	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`	$6.59B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.59B	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`	$6.28B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.28B	USD	Point-in-time
Total Liabilities and Equity	`LiabilitiesAndStockholdersEquity`	$14.06B	USD	Point-in-time
Total Liabilities and Equity	`LiabilitiesAndStockholdersEquity`	$14.06B	USD	Point-in-time
Total Liabilities and Equity	`LiabilitiesAndStockholdersEquity`	$14.15B	USD	Point-in-time
Total Liabilities and Equity	`LiabilitiesAndStockholdersEquity`	$14.15B	USD	Point-in-time

Income Statement 96 line items

Line Item	Tag	Value	Unit	Period
Sales (E)	`RevenueFromContractWithCustomerExcludingAssessedTax`	$11.89B	USD	Annual
Sales (E)	`RevenueFromContractWithCustomerExcludingAssessedTax`	$11.89B	USD	Annual
Sales (E)	`RevenueFromContractWithCustomerExcludingAssessedTax`	$12.45B	USD	Annual
Sales (E)	`RevenueFromContractWithCustomerExcludingAssessedTax`	$12.45B	USD	Annual
Sales (E)	`RevenueFromContractWithCustomerExcludingAssessedTax`	$10.55B	USD	Annual
Sales (E)	`RevenueFromContractWithCustomerExcludingAssessedTax`	$10.55B	USD	Annual
Cost of goods sold (exclusive of expenses below)	`CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization`	$9.81B	USD	Annual
Cost of goods sold (exclusive of expenses below)	`CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization`	$9.81B	USD	Annual
Cost of goods sold (exclusive of expenses below)	`CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization`	$10.21B	USD	Annual
Cost of goods sold (exclusive of expenses below)	`CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization`	$10.21B	USD	Annual
Cost of goods sold (exclusive of expenses below)	`CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization`	$10.04B	USD	Annual
Cost of goods sold (exclusive of expenses below)	`CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization`	$10.04B	USD	Annual
Selling, general administrative, and other expenses	`SellingGeneralAndAdministrativeExpense`	$226.00M	USD	Annual
Selling, general administrative, and other expenses	`SellingGeneralAndAdministrativeExpense`	$226.00M	USD	Annual
Selling, general administrative, and other expenses	`SellingGeneralAndAdministrativeExpense`	$275.00M	USD	Annual
Selling, general administrative, and other expenses	`SellingGeneralAndAdministrativeExpense`	$275.00M	USD	Annual
Selling, general administrative, and other expenses	`SellingGeneralAndAdministrativeExpense`	$204.00M	USD	Annual
Selling, general administrative, and other expenses	`SellingGeneralAndAdministrativeExpense`	$204.00M	USD	Annual
Research and development expenses	`ResearchAndDevelopmentExpense`	$57.00M	USD	Annual
Research and development expenses	`ResearchAndDevelopmentExpense`	$57.00M	USD	Annual
Research and development expenses	`ResearchAndDevelopmentExpense`	$39.00M	USD	Annual
Research and development expenses	`ResearchAndDevelopmentExpense`	$39.00M	USD	Annual
Research and development expenses	`ResearchAndDevelopmentExpense`	$32.00M	USD	Annual
Research and development expenses	`ResearchAndDevelopmentExpense`	$32.00M	USD	Annual
Provision for depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$632.00M	USD	Annual
Provision for depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$632.00M	USD	Annual
Provision for depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$642.00M	USD	Annual
Provision for depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$642.00M	USD	Annual
Provision for depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$617.00M	USD	Annual
Provision for depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$617.00M	USD	Annual
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$341.00M	USD	Annual
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$341.00M	USD	Annual
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$696.00M	USD	Annual
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$696.00M	USD	Annual
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$184.00M	USD	Annual
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$184.00M	USD	Annual
Interest expense (U)	`InterestExpense`	$156.00M	USD	Annual
Interest expense (U)	`InterestExpense`	$156.00M	USD	Annual
Interest expense (U)	`InterestExpense`	$107.00M	USD	Annual
Interest expense (U)	`InterestExpense`	$107.00M	USD	Annual
Interest expense (U)	`InterestExpense`	$106.00M	USD	Annual
Interest expense (U)	`InterestExpense`	$106.00M	USD	Annual
Other expenses (income), net (U)	`NonoperatingIncomeExpense`	$-91.00M	USD	Annual
Other expenses (income), net (U)	`NonoperatingIncomeExpense`	$-91.00M	USD	Annual
Other expenses (income), net (U)	`NonoperatingIncomeExpense`	$-134.00M	USD	Annual
Other expenses (income), net (U)	`NonoperatingIncomeExpense`	$-134.00M	USD	Annual
Other expenses (income), net (U)	`NonoperatingIncomeExpense`	$118.00M	USD	Annual
Other expenses (income), net (U)	`NonoperatingIncomeExpense`	$118.00M	USD	Annual
Total costs and expenses	`CostsAndOperatingExpensesAndNonoperatingIncomeExpenses`	$11.13B	USD	Annual
Total costs and expenses	`CostsAndOperatingExpensesAndNonoperatingIncomeExpenses`	$11.13B	USD	Annual
Total costs and expenses	`CostsAndOperatingExpensesAndNonoperatingIncomeExpenses`	$11.61B	USD	Annual
Total costs and expenses	`CostsAndOperatingExpensesAndNonoperatingIncomeExpenses`	$11.61B	USD	Annual
Total costs and expenses	`CostsAndOperatingExpensesAndNonoperatingIncomeExpenses`	$11.75B	USD	Annual
Total costs and expenses	`CostsAndOperatingExpensesAndNonoperatingIncomeExpenses`	$11.75B	USD	Annual
Income (Loss) before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$702.00M	USD	Annual
Income (Loss) before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$702.00M	USD	Annual
Income (Loss) before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$289.00M	USD	Annual
Income (Loss) before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$289.00M	USD	Annual
Income (Loss) before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$-584.00M	USD	Annual
Income (Loss) before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$-584.00M	USD	Annual
Provision for income taxes (Q)	`IncomeTaxExpenseBenefit`	$189.00M	USD	Annual
Provision for income taxes (Q)	`IncomeTaxExpenseBenefit`	$189.00M	USD	Annual
Provision for income taxes (Q)	`IncomeTaxExpenseBenefit`	$265.00M	USD	Annual
Provision for income taxes (Q)	`IncomeTaxExpenseBenefit`	$265.00M	USD	Annual
Provision for income taxes (Q)	`IncomeTaxExpenseBenefit`	$664.00M	USD	Annual
Provision for income taxes (Q)	`IncomeTaxExpenseBenefit`	$664.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$24.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$24.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$38.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$38.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$-773.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$-773.00M	USD	Annual
Less: Net (loss) income attributable to noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-36.00M	USD	Annual
Less: Net (loss) income attributable to noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-36.00M	USD	Annual
Less: Net (loss) income attributable to noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$161.00M	USD	Annual
Less: Net (loss) income attributable to noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$161.00M	USD	Annual
Less: Net (loss) income attributable to noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-122.00M	USD	Annual
Less: Net (loss) income attributable to noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-122.00M	USD	Annual
Net income (loss) attributable to Alcoa Corporation	`NetIncomeLoss`	$-123.00M	USD	Annual
Net income (loss) attributable to Alcoa Corporation	`NetIncomeLoss`	$-123.00M	USD	Annual
Net income (loss) attributable to Alcoa Corporation	`NetIncomeLoss`	$-651.00M	USD	Annual
Net income (loss) attributable to Alcoa Corporation	`NetIncomeLoss`	$-651.00M	USD	Annual
Net income (loss) attributable to Alcoa Corporation	`NetIncomeLoss`	$60.00M	USD	Annual
Net income (loss) attributable to Alcoa Corporation	`NetIncomeLoss`	$60.00M	USD	Annual
Basic	`EarningsPerShareBasic`	$0.26	USD	Annual
Basic	`EarningsPerShareBasic`	$0.26	USD	Annual
Basic	`EarningsPerShareBasic`	$-3.65	USD	Annual
Basic	`EarningsPerShareBasic`	$-3.65	USD	Annual
Basic	`EarningsPerShareBasic`	$-0.68	USD	Annual
Basic	`EarningsPerShareBasic`	$-0.68	USD	Annual
Diluted	`EarningsPerShareDiluted`	$-0.68	USD	Annual
Diluted	`EarningsPerShareDiluted`	$-0.68	USD	Annual
Diluted	`EarningsPerShareDiluted`	$-3.65	USD	Annual
Diluted	`EarningsPerShareDiluted`	$-3.65	USD	Annual
Diluted	`EarningsPerShareDiluted`	$0.26	USD	Annual
Diluted	`EarningsPerShareDiluted`	$0.26	USD	Annual

Cash Flow Statement 262 line items

Line Item	Tag	Value	Unit	Period
Net income (loss)	`ProfitLoss`	$24.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$24.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$38.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$38.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$-773.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$-773.00M	USD	Annual
Depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$632.00M	USD	Annual
Depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$632.00M	USD	Annual
Depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$642.00M	USD	Annual
Depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$642.00M	USD	Annual
Depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$617.00M	USD	Annual
Depreciation, depletion, and amortization	`DepreciationDepletionAndAmortization`	$617.00M	USD	Annual
Deferred income taxes (Q)	`DeferredIncomeTaxExpenseBenefit`	$-22.00M	USD	Annual
Deferred income taxes (Q)	`DeferredIncomeTaxExpenseBenefit`	$-22.00M	USD	Annual
Deferred income taxes (Q)	`DeferredIncomeTaxExpenseBenefit`	$23.00M	USD	Annual
Deferred income taxes (Q)	`DeferredIncomeTaxExpenseBenefit`	$23.00M	USD	Annual
Deferred income taxes (Q)	`DeferredIncomeTaxExpenseBenefit`	$219.00M	USD	Annual
Deferred income taxes (Q)	`DeferredIncomeTaxExpenseBenefit`	$219.00M	USD	Annual
Equity (income) loss, net of dividends (H)	`IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions`	$-201.00M	USD	Annual
Equity (income) loss, net of dividends (H)	`IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions`	$-201.00M	USD	Annual
Equity (income) loss, net of dividends (H)	`IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions`	$2.00M	USD	Annual
Equity (income) loss, net of dividends (H)	`IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions`	$2.00M	USD	Annual
Equity (income) loss, net of dividends (H)	`IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions`	$-4.00M	USD	Annual
Equity (income) loss, net of dividends (H)	`IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions`	$-4.00M	USD	Annual
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$341.00M	USD	Annual
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$341.00M	USD	Annual
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$696.00M	USD	Annual
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$696.00M	USD	Annual
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$184.00M	USD	Annual
Restructuring and other charges, net (D)	`RestructuringAndOtherChargesBenefitNet`	$184.00M	USD	Annual
Net loss from investing activities - asset sales (U)	`GainLossOnDispositionOfAssets1`	$-10.00M	USD	Annual
Net loss from investing activities - asset sales (U)	`GainLossOnDispositionOfAssets1`	$-10.00M	USD	Annual
Net loss from investing activities - asset sales (U)	`GainLossOnDispositionOfAssets1`	$-18.00M	USD	Annual
Net loss from investing activities - asset sales (U)	`GainLossOnDispositionOfAssets1`	$-18.00M	USD	Annual
Net loss from investing activities - asset sales (U)	`GainLossOnDispositionOfAssets1`	$-37.00M	USD	Annual
Net loss from investing activities - asset sales (U)	`GainLossOnDispositionOfAssets1`	$-37.00M	USD	Annual
Net periodic pension benefit cost (O)	`DefinedBenefitPensionPlansNetPeriodicBenefitCost`	$6.00M	USD	Annual
Net periodic pension benefit cost (O)	`DefinedBenefitPensionPlansNetPeriodicBenefitCost`	$6.00M	USD	Annual
Net periodic pension benefit cost (O)	`DefinedBenefitPensionPlansNetPeriodicBenefitCost`	$10.00M	USD	Annual
Net periodic pension benefit cost (O)	`DefinedBenefitPensionPlansNetPeriodicBenefitCost`	$10.00M	USD	Annual
Net periodic pension benefit cost (O)	`DefinedBenefitPensionPlansNetPeriodicBenefitCost`	$54.00M	USD	Annual
Net periodic pension benefit cost (O)	`DefinedBenefitPensionPlansNetPeriodicBenefitCost`	$54.00M	USD	Annual
Stock-based compensation (N)	`ShareBasedCompensation`	$35.00M	USD	Annual
Stock-based compensation (N)	`ShareBasedCompensation`	$35.00M	USD	Annual
Stock-based compensation (N)	`ShareBasedCompensation`	$36.00M	USD	Annual
Stock-based compensation (N)	`ShareBasedCompensation`	$36.00M	USD	Annual
Stock-based compensation (N)	`ShareBasedCompensation`	$40.00M	USD	Annual
Stock-based compensation (N)	`ShareBasedCompensation`	$40.00M	USD	Annual
(Gain) loss on mark-to-market derivative financial contracts	`GainOnMarkToMarketDerivativeFinancialContracts`	$44.00M	USD	Annual
(Gain) loss on mark-to-market derivative financial contracts	`GainOnMarkToMarketDerivativeFinancialContracts`	$44.00M	USD	Annual
(Gain) loss on mark-to-market derivative financial contracts	`GainOnMarkToMarketDerivativeFinancialContracts`	$8.00M	USD	Annual
(Gain) loss on mark-to-market derivative financial contracts	`GainOnMarkToMarketDerivativeFinancialContracts`	$8.00M	USD	Annual
(Gain) loss on mark-to-market derivative financial contracts	`GainOnMarkToMarketDerivativeFinancialContracts`	$-26.00M	USD	Annual
(Gain) loss on mark-to-market derivative financial contracts	`GainOnMarkToMarketDerivativeFinancialContracts`	$-26.00M	USD	Annual
Other	`OtherNoncashIncomeExpense`	$-78.00M	USD	Annual
Other	`OtherNoncashIncomeExpense`	$-78.00M	USD	Annual
Other	`OtherNoncashIncomeExpense`	$-53.00M	USD	Annual
Other	`OtherNoncashIncomeExpense`	$-53.00M	USD	Annual
Other	`OtherNoncashIncomeExpense`	$-34.00M	USD	Annual
Other	`OtherNoncashIncomeExpense`	$-34.00M	USD	Annual
(Increase) decrease in receivables	`IncreaseDecreaseInReceivables`	$59.00M	USD	Annual
(Increase) decrease in receivables	`IncreaseDecreaseInReceivables`	$59.00M	USD	Annual
(Increase) decrease in receivables	`IncreaseDecreaseInReceivables`	$-104.00M	USD	Annual
(Increase) decrease in receivables	`IncreaseDecreaseInReceivables`	$-104.00M	USD	Annual
(Increase) decrease in receivables	`IncreaseDecreaseInReceivables`	$493.00M	USD	Annual
(Increase) decrease in receivables	`IncreaseDecreaseInReceivables`	$493.00M	USD	Annual
Decrease (increase) in inventories (J)	`IncreaseDecreaseInInventories`	$547.00M	USD	Annual
Decrease (increase) in inventories (J)	`IncreaseDecreaseInInventories`	$547.00M	USD	Annual
Decrease (increase) in inventories (J)	`IncreaseDecreaseInInventories`	$-243.00M	USD	Annual
Decrease (increase) in inventories (J)	`IncreaseDecreaseInInventories`	$-243.00M	USD	Annual
Decrease (increase) in inventories (J)	`IncreaseDecreaseInInventories`	$-51.00M	USD	Annual
Decrease (increase) in inventories (J)	`IncreaseDecreaseInInventories`	$-51.00M	USD	Annual
(Increase) decrease in prepaid expenses and other current assets	`IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets`	$-39.00M	USD	Annual
(Increase) decrease in prepaid expenses and other current assets	`IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets`	$-39.00M	USD	Annual
(Increase) decrease in prepaid expenses and other current assets	`IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets`	$-44.00M	USD	Annual
(Increase) decrease in prepaid expenses and other current assets	`IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets`	$-44.00M	USD	Annual
(Increase) decrease in prepaid expenses and other current assets	`IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets`	$68.00M	USD	Annual
(Increase) decrease in prepaid expenses and other current assets	`IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets`	$68.00M	USD	Annual
Increase (decrease) in accounts payable, trade	`IncreaseDecreaseInAccountsPayableTrade`	$-74.00M	USD	Annual
Increase (decrease) in accounts payable, trade	`IncreaseDecreaseInAccountsPayableTrade`	$-74.00M	USD	Annual
Increase (decrease) in accounts payable, trade	`IncreaseDecreaseInAccountsPayableTrade`	$190.00M	USD	Annual
Increase (decrease) in accounts payable, trade	`IncreaseDecreaseInAccountsPayableTrade`	$190.00M	USD	Annual
Increase (decrease) in accounts payable, trade	`IncreaseDecreaseInAccountsPayableTrade`	$189.00M	USD	Annual
Increase (decrease) in accounts payable, trade	`IncreaseDecreaseInAccountsPayableTrade`	$189.00M	USD	Annual
Decrease in accrued expenses	`IncreaseDecreaseInAccruedLiabilities`	$-133.00M	USD	Annual
Decrease in accrued expenses	`IncreaseDecreaseInAccruedLiabilities`	$-133.00M	USD	Annual
Decrease in accrued expenses	`IncreaseDecreaseInAccruedLiabilities`	$-108.00M	USD	Annual
Decrease in accrued expenses	`IncreaseDecreaseInAccruedLiabilities`	$-108.00M	USD	Annual
Decrease in accrued expenses	`IncreaseDecreaseInAccruedLiabilities`	$-173.00M	USD	Annual
Decrease in accrued expenses	`IncreaseDecreaseInAccruedLiabilities`	$-173.00M	USD	Annual
Increase (decrease) in taxes, including income taxes	`IncreaseDecreaseInAccruedTaxesPayable`	$95.00M	USD	Annual
Increase (decrease) in taxes, including income taxes	`IncreaseDecreaseInAccruedTaxesPayable`	$95.00M	USD	Annual
Increase (decrease) in taxes, including income taxes	`IncreaseDecreaseInAccruedTaxesPayable`	$-152.00M	USD	Annual
Increase (decrease) in taxes, including income taxes	`IncreaseDecreaseInAccruedTaxesPayable`	$-152.00M	USD	Annual
Increase (decrease) in taxes, including income taxes	`IncreaseDecreaseInAccruedTaxesPayable`	$-146.00M	USD	Annual
Increase (decrease) in taxes, including income taxes	`IncreaseDecreaseInAccruedTaxesPayable`	$-146.00M	USD	Annual
Pension contributions (O)	`PensionContributions`	$24.00M	USD	Annual
Pension contributions (O)	`PensionContributions`	$24.00M	USD	Annual
Pension contributions (O)	`PensionContributions`	$17.00M	USD	Annual
Pension contributions (O)	`PensionContributions`	$17.00M	USD	Annual
Pension contributions (O)	`PensionContributions`	$16.00M	USD	Annual
Pension contributions (O)	`PensionContributions`	$16.00M	USD	Annual
Increase in noncurrent assets	`IncreaseDecreaseInOtherNoncurrentAssets`	$87.00M	USD	Annual
Increase in noncurrent assets	`IncreaseDecreaseInOtherNoncurrentAssets`	$87.00M	USD	Annual
Increase in noncurrent assets	`IncreaseDecreaseInOtherNoncurrentAssets`	$210.00M	USD	Annual
Increase in noncurrent assets	`IncreaseDecreaseInOtherNoncurrentAssets`	$210.00M	USD	Annual
Increase in noncurrent assets	`IncreaseDecreaseInOtherNoncurrentAssets`	$4.00M	USD	Annual
Increase in noncurrent assets	`IncreaseDecreaseInOtherNoncurrentAssets`	$4.00M	USD	Annual
Decrease in noncurrent liabilities	`IncreaseDecreaseInOtherNoncurrentLiabilities`	$-63.00M	USD	Annual
Decrease in noncurrent liabilities	`IncreaseDecreaseInOtherNoncurrentLiabilities`	$-63.00M	USD	Annual
Decrease in noncurrent liabilities	`IncreaseDecreaseInOtherNoncurrentLiabilities`	$-162.00M	USD	Annual
Decrease in noncurrent liabilities	`IncreaseDecreaseInOtherNoncurrentLiabilities`	$-162.00M	USD	Annual
Decrease in noncurrent liabilities	`IncreaseDecreaseInOtherNoncurrentLiabilities`	$-93.00M	USD	Annual
Decrease in noncurrent liabilities	`IncreaseDecreaseInOtherNoncurrentLiabilities`	$-93.00M	USD	Annual
Cash provided from operations	`NetCashProvidedByUsedInOperatingActivities`	$91.00M	USD	Annual
Cash provided from operations	`NetCashProvidedByUsedInOperatingActivities`	$91.00M	USD	Annual
Cash provided from operations	`NetCashProvidedByUsedInOperatingActivities`	$622.00M	USD	Annual
Cash provided from operations	`NetCashProvidedByUsedInOperatingActivities`	$622.00M	USD	Annual
Cash provided from operations	`NetCashProvidedByUsedInOperatingActivities`	$822.00M	USD	Annual
Cash provided from operations	`NetCashProvidedByUsedInOperatingActivities`	$822.00M	USD	Annual
Additions to debt (M)	`AdditionsToLongTermDebtIssuedLessIssuanceDiscount`	$1.03B	USD	Annual
Additions to debt (M)	`AdditionsToLongTermDebtIssuedLessIssuanceDiscount`	$1.03B	USD	Annual
Additions to debt (M)	`AdditionsToLongTermDebtIssuedLessIssuanceDiscount`	$4.00M	USD	Annual
Additions to debt (M)	`AdditionsToLongTermDebtIssuedLessIssuanceDiscount`	$4.00M	USD	Annual
Additions to debt (M)	`AdditionsToLongTermDebtIssuedLessIssuanceDiscount`	$127.00M	USD	Annual
Additions to debt (M)	`AdditionsToLongTermDebtIssuedLessIssuanceDiscount`	$127.00M	USD	Annual
Payments on debt (M)	`RepaymentsOfLongTermDebt`	$679.00M	USD	Annual
Payments on debt (M)	`RepaymentsOfLongTermDebt`	$679.00M	USD	Annual
Payments on debt (M)	`RepaymentsOfLongTermDebt`	$72.00M	USD	Annual
Payments on debt (M)	`RepaymentsOfLongTermDebt`	$72.00M	USD	Annual
Payments on debt (M)	`RepaymentsOfLongTermDebt`	$1.00M	USD	Annual
Payments on debt (M)	`RepaymentsOfLongTermDebt`	$1.00M	USD	Annual
Proceeds from the exercise of employee stock options (N)	`ProceedsFromStockOptionsExercised`	-	USD	Annual
Proceeds from the exercise of employee stock options (N)	`ProceedsFromStockOptionsExercised`	-	USD	Annual
Proceeds from the exercise of employee stock options (N)	`ProceedsFromStockOptionsExercised`	$1.00M	USD	Annual
Proceeds from the exercise of employee stock options (N)	`ProceedsFromStockOptionsExercised`	$1.00M	USD	Annual
Proceeds from the exercise of employee stock options (N)	`ProceedsFromStockOptionsExercised`	$22.00M	USD	Annual
Proceeds from the exercise of employee stock options (N)	`ProceedsFromStockOptionsExercised`	$22.00M	USD	Annual
Repurchase of common stock (N)	`PaymentsForRepurchaseOfCommonStock`	-	USD	Annual
Repurchase of common stock (N)	`PaymentsForRepurchaseOfCommonStock`	-	USD	Annual
Repurchase of common stock (N)	`PaymentsForRepurchaseOfCommonStock`	$500.00M	USD	Annual
Repurchase of common stock (N)	`PaymentsForRepurchaseOfCommonStock`	$500.00M	USD	Annual
Repurchase of common stock (N)	`PaymentsForRepurchaseOfCommonStock`	-	USD	Annual
Repurchase of common stock (N)	`PaymentsForRepurchaseOfCommonStock`	-	USD	Annual
Dividends paid on Alcoa preferred stock (N)	`PaymentsOfDividendsPreferredStockAndPreferenceStock`	-	USD	Annual
Dividends paid on Alcoa preferred stock (N)	`PaymentsOfDividendsPreferredStockAndPreferenceStock`	-	USD	Annual
Dividends paid on Alcoa preferred stock (N)	`PaymentsOfDividendsPreferredStockAndPreferenceStock`	$1.00M	USD	Annual
Dividends paid on Alcoa preferred stock (N)	`PaymentsOfDividendsPreferredStockAndPreferenceStock`	$1.00M	USD	Annual
Dividends paid on Alcoa preferred stock (N)	`PaymentsOfDividendsPreferredStockAndPreferenceStock`	-	USD	Annual
Dividends paid on Alcoa preferred stock (N)	`PaymentsOfDividendsPreferredStockAndPreferenceStock`	-	USD	Annual
Dividends paid on Alcoa common stock (N)	`PaymentsOfDividendsCommonStock`	$72.00M	USD	Annual
Dividends paid on Alcoa common stock (N)	`PaymentsOfDividendsCommonStock`	$72.00M	USD	Annual
Dividends paid on Alcoa common stock (N)	`PaymentsOfDividendsCommonStock`	$72.00M	USD	Annual
Dividends paid on Alcoa common stock (N)	`PaymentsOfDividendsCommonStock`	$72.00M	USD	Annual
Dividends paid on Alcoa common stock (N)	`PaymentsOfDividendsCommonStock`	$89.00M	USD	Annual
Dividends paid on Alcoa common stock (N)	`PaymentsOfDividendsCommonStock`	$89.00M	USD	Annual
Payments related to tax withholding on stock-based compensation awards	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$15.00M	USD	Annual
Payments related to tax withholding on stock-based compensation awards	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$15.00M	USD	Annual
Payments related to tax withholding on stock-based compensation awards	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$19.00M	USD	Annual
Payments related to tax withholding on stock-based compensation awards	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$19.00M	USD	Annual
Payments related to tax withholding on stock-based compensation awards	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$34.00M	USD	Annual
Payments related to tax withholding on stock-based compensation awards	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$34.00M	USD	Annual
Financial contributions for the divestiture of businesses (C)	`PaymentsForFinancialContributionsForTheDivestitureOfBusinesses`	$33.00M	USD	Annual
Financial contributions for the divestiture of businesses (C)	`PaymentsForFinancialContributionsForTheDivestitureOfBusinesses`	$33.00M	USD	Annual
Financial contributions for the divestiture of businesses (C)	`PaymentsForFinancialContributionsForTheDivestitureOfBusinesses`	$35.00M	USD	Annual
Financial contributions for the divestiture of businesses (C)	`PaymentsForFinancialContributionsForTheDivestitureOfBusinesses`	$35.00M	USD	Annual
Financial contributions for the divestiture of businesses (C)	`PaymentsForFinancialContributionsForTheDivestitureOfBusinesses`	$52.00M	USD	Annual
Financial contributions for the divestiture of businesses (C)	`PaymentsForFinancialContributionsForTheDivestitureOfBusinesses`	$52.00M	USD	Annual
Contributions from noncontrolling interest (A)	`ProceedsFromMinorityShareholders`	$214.00M	USD	Annual
Contributions from noncontrolling interest (A)	`ProceedsFromMinorityShareholders`	$214.00M	USD	Annual
Contributions from noncontrolling interest (A)	`ProceedsFromMinorityShareholders`	$65.00M	USD	Annual
Contributions from noncontrolling interest (A)	`ProceedsFromMinorityShareholders`	$65.00M	USD	Annual
Contributions from noncontrolling interest (A)	`ProceedsFromMinorityShareholders`	$188.00M	USD	Annual
Contributions from noncontrolling interest (A)	`ProceedsFromMinorityShareholders`	$188.00M	USD	Annual
Distributions to noncontrolling interest (A)	`PaymentsOfDividendsMinorityInterest`	$379.00M	USD	Annual
Distributions to noncontrolling interest (A)	`PaymentsOfDividendsMinorityInterest`	$379.00M	USD	Annual
Distributions to noncontrolling interest (A)	`PaymentsOfDividendsMinorityInterest`	$30.00M	USD	Annual
Distributions to noncontrolling interest (A)	`PaymentsOfDividendsMinorityInterest`	$30.00M	USD	Annual
Distributions to noncontrolling interest (A)	`PaymentsOfDividendsMinorityInterest`	$49.00M	USD	Annual
Distributions to noncontrolling interest (A)	`PaymentsOfDividendsMinorityInterest`	$49.00M	USD	Annual
Acquisition of noncontrolling interest (C)	`PaymentsToAcquireNoncontrollingInterest`	-	USD	Annual
Acquisition of noncontrolling interest (C)	`PaymentsToAcquireNoncontrollingInterest`	-	USD	Annual
Acquisition of noncontrolling interest (C)	`PaymentsToAcquireNoncontrollingInterest`	-	USD	Annual
Acquisition of noncontrolling interest (C)	`PaymentsToAcquireNoncontrollingInterest`	-	USD	Annual
Acquisition of noncontrolling interest (C)	`PaymentsToAcquireNoncontrollingInterest`	$23.00M	USD	Annual
Acquisition of noncontrolling interest (C)	`PaymentsToAcquireNoncontrollingInterest`	$23.00M	USD	Annual
Other	`ProceedsFromPaymentsForOtherFinancingActivities`	$1.00M	USD	Annual
Other	`ProceedsFromPaymentsForOtherFinancingActivities`	$1.00M	USD	Annual
Other	`ProceedsFromPaymentsForOtherFinancingActivities`	$-4.00M	USD	Annual
Other	`ProceedsFromPaymentsForOtherFinancingActivities`	$-4.00M	USD	Annual
Other	`ProceedsFromPaymentsForOtherFinancingActivities`	$-5.00M	USD	Annual
Other	`ProceedsFromPaymentsForOtherFinancingActivities`	$-5.00M	USD	Annual
Cash provided from (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-768.00M	USD	Annual
Cash provided from (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-768.00M	USD	Annual
Cash provided from (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$57.00M	USD	Annual
Cash provided from (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$57.00M	USD	Annual
Cash provided from (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$201.00M	USD	Annual
Cash provided from (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$201.00M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$580.00M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$580.00M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$480.00M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$480.00M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$531.00M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$531.00M	USD	Annual
Proceeds from the sale of assets and businesses (C)	`ProceedsFromSaleOfPropertyPlantAndEquipment`	$5.00M	USD	Annual
Proceeds from the sale of assets and businesses (C)	`ProceedsFromSaleOfPropertyPlantAndEquipment`	$5.00M	USD	Annual
Proceeds from the sale of assets and businesses (C)	`ProceedsFromSaleOfPropertyPlantAndEquipment`	$4.00M	USD	Annual
Proceeds from the sale of assets and businesses (C)	`ProceedsFromSaleOfPropertyPlantAndEquipment`	$4.00M	USD	Annual
Proceeds from the sale of assets and businesses (C)	`ProceedsFromSaleOfPropertyPlantAndEquipment`	$3.00M	USD	Annual
Proceeds from the sale of assets and businesses (C)	`ProceedsFromSaleOfPropertyPlantAndEquipment`	$3.00M	USD	Annual
Additions to investments (H)	`PaymentsToAcquireInvestments`	$37.00M	USD	Annual
Additions to investments (H)	`PaymentsToAcquireInvestments`	$37.00M	USD	Annual
Additions to investments (H)	`PaymentsToAcquireInvestments`	$32.00M	USD	Annual
Additions to investments (H)	`PaymentsToAcquireInvestments`	$32.00M	USD	Annual
Additions to investments (H)	`PaymentsToAcquireInvestments`	$70.00M	USD	Annual
Additions to investments (H)	`PaymentsToAcquireInvestments`	$70.00M	USD	Annual
Sale of investments (H)	`ProceedsFromSaleOfInvestmentProjects`	-	USD	Annual
Sale of investments (H)	`ProceedsFromSaleOfInvestmentProjects`	-	USD	Annual
Sale of investments (H)	`ProceedsFromSaleOfInvestmentProjects`	-	USD	Annual
Sale of investments (H)	`ProceedsFromSaleOfInvestmentProjects`	-	USD	Annual
Sale of investments (H)	`ProceedsFromSaleOfInvestmentProjects`	$10.00M	USD	Annual
Sale of investments (H)	`ProceedsFromSaleOfInvestmentProjects`	$10.00M	USD	Annual
Other	`PaymentsForProceedsFromOtherInvestingActivities`	$-6.00M	USD	Annual
Other	`PaymentsForProceedsFromOtherInvestingActivities`	$-6.00M	USD	Annual
Other	`PaymentsForProceedsFromOtherInvestingActivities`	$-12.00M	USD	Annual
Other	`PaymentsForProceedsFromOtherInvestingActivities`	$-12.00M	USD	Annual
Other	`PaymentsForProceedsFromOtherInvestingActivities`	$-2.00M	USD	Annual
Other	`PaymentsForProceedsFromOtherInvestingActivities`	$-2.00M	USD	Annual
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-608.00M	USD	Annual
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-608.00M	USD	Annual
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-585.00M	USD	Annual
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-585.00M	USD	Annual
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-495.00M	USD	Annual
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-495.00M	USD	Annual
Effect of exchange rate changes on cash and cash equivalents and restricted cash	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-9.00M	USD	Annual
Effect of exchange rate changes on cash and cash equivalents and restricted cash	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-9.00M	USD	Annual
Effect of exchange rate changes on cash and cash equivalents and restricted cash	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$10.00M	USD	Annual
Effect of exchange rate changes on cash and cash equivalents and restricted cash	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$10.00M	USD	Annual
Effect of exchange rate changes on cash and cash equivalents and restricted cash	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-28.00M	USD	Annual
Effect of exchange rate changes on cash and cash equivalents and restricted cash	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-28.00M	USD	Annual
Net change in cash and cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$-427.00M	USD	Annual
Net change in cash and cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$-427.00M	USD	Annual
Net change in cash and cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$-450.00M	USD	Annual
Net change in cash and cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$-450.00M	USD	Annual
Net change in cash and cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$187.00M	USD	Annual
Net change in cash and cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$187.00M	USD	Annual
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`	$1.05B	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`	$1.92B	USD	Point-in-time
Cash and cash equivalents and restricted cash at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.92B	USD	Point-in-time
Cash and cash equivalents and restricted cash at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.47B	USD	Point-in-time
Cash and cash equivalents and restricted cash at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.47B	USD	Point-in-time
Cash and cash equivalents and restricted cash at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.23B	USD	Point-in-time
Cash and cash equivalents and restricted cash at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.23B	USD	Point-in-time
Cash and cash equivalents and restricted cash at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.05B	USD	Point-in-time
Cash and cash equivalents and restricted cash at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.05B	USD	Point-in-time
Cash and cash equivalents and restricted cash at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.92B	USD	Point-in-time
Cash and cash equivalents and restricted cash at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.92B	USD	Point-in-time
Cash and cash equivalents and restricted cash at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.47B	USD	Point-in-time
Cash and cash equivalents and restricted cash at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$1.47B	USD	Point-in-time

Stockholders Equity 78 line items

Line Item	Tag	Value	Unit	Period
Common stock dividends per share	`CommonStockDividendsPerShareCashPaid`	$0.10	USD	Annual
Common stock dividends per share	`CommonStockDividendsPerShareCashPaid`	$0.10	USD	Annual
Common stock dividends per share	`CommonStockDividendsPerShareCashPaid`	$0.10	USD	Annual
Common stock dividends per share	`CommonStockDividendsPerShareCashPaid`	$0.10	USD	Annual
Common stock dividends per share	`CommonStockDividendsPerShareCashPaid`	$0.10	USD	Annual
Common stock dividends per share	`CommonStockDividendsPerShareCashPaid`	$0.10	USD	Annual
Preferred stock dividends per share	`PreferredStockDividendsPerShareCashPaid`	$0.10	USD	Annual
Preferred stock dividends per share	`PreferredStockDividendsPerShareCashPaid`	$0.10	USD	Annual
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.84B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.84B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.59B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.59B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.16B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.16B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.28B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.28B	USD	Point-in-time
Net income (loss)	`ProfitLoss`	$24.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$24.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$38.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$38.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$-773.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$-773.00M	USD	Annual
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$960.00M	USD	Annual
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$960.00M	USD	Annual
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$-60.00M	USD	Annual
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$-60.00M	USD	Annual
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$-467.00M	USD	Annual
Other comprehensive income (loss) (G)	`OtherComprehensiveIncomeLossNetOfTax`	$-467.00M	USD	Annual
Stock-based compensation (N)	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$35.00M	USD	Annual
Stock-based compensation (N)	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$35.00M	USD	Annual
Stock-based compensation (N)	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$36.00M	USD	Annual
Stock-based compensation (N)	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$36.00M	USD	Annual
Stock-based compensation (N)	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$40.00M	USD	Annual
Stock-based compensation (N)	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$40.00M	USD	Annual
Net effect of tax withholding for compensation plans and exercise of stock options (N)	`NetEffectOfTaxWithholdingShareBasedCompensationArrangementAndStockOptionsExercised`	$3.00M	USD	Annual
Net effect of tax withholding for compensation plans and exercise of stock options (N)	`NetEffectOfTaxWithholdingShareBasedCompensationArrangementAndStockOptionsExercised`	$3.00M	USD	Annual
Net effect of tax withholding for compensation plans and exercise of stock options (N)	`NetEffectOfTaxWithholdingShareBasedCompensationArrangementAndStockOptionsExercised`	$-15.00M	USD	Annual
Net effect of tax withholding for compensation plans and exercise of stock options (N)	`NetEffectOfTaxWithholdingShareBasedCompensationArrangementAndStockOptionsExercised`	$-15.00M	USD	Annual
Net effect of tax withholding for compensation plans and exercise of stock options (N)	`NetEffectOfTaxWithholdingShareBasedCompensationArrangementAndStockOptionsExercised`	$-33.00M	USD	Annual
Net effect of tax withholding for compensation plans and exercise of stock options (N)	`NetEffectOfTaxWithholdingShareBasedCompensationArrangementAndStockOptionsExercised`	$-33.00M	USD	Annual
Repurchase of common stock (N)	`StockRepurchasedDuringPeriodValue`	$500.00M	USD	Annual
Repurchase of common stock (N)	`StockRepurchasedDuringPeriodValue`	$500.00M	USD	Annual
Dividends paid on Alcoa common stock ($0.10 per share) (N)	`DividendsCommonStock`	$72.00M	USD	Annual
Dividends paid on Alcoa common stock ($0.10 per share) (N)	`DividendsCommonStock`	$72.00M	USD	Annual
Dividends paid on Alcoa common stock ($0.10 per share) (N)	`DividendsCommonStock`	$89.00M	USD	Annual
Dividends paid on Alcoa common stock ($0.10 per share) (N)	`DividendsCommonStock`	$89.00M	USD	Annual
Dividends paid on Alcoa common stock ($0.10 per share) (N)	`DividendsCommonStock`	$72.00M	USD	Annual
Dividends paid on Alcoa common stock ($0.10 per share) (N)	`DividendsCommonStock`	$72.00M	USD	Annual
Dividends paid on Alcoa preferred stock ($0.10 per share) (N)	`DividendsPreferredStock`	$1.00M	USD	Annual
Dividends paid on Alcoa preferred stock ($0.10 per share) (N)	`DividendsPreferredStock`	$1.00M	USD	Annual
Contributions	`MinorityInterestIncreaseDecreaseFromCapitalContributionFromNoncontrollingInterestHolders`	$65.00M	USD	Annual
Contributions	`MinorityInterestIncreaseDecreaseFromCapitalContributionFromNoncontrollingInterestHolders`	$65.00M	USD	Annual
Contributions	`MinorityInterestIncreaseDecreaseFromCapitalContributionFromNoncontrollingInterestHolders`	$188.00M	USD	Annual
Contributions	`MinorityInterestIncreaseDecreaseFromCapitalContributionFromNoncontrollingInterestHolders`	$188.00M	USD	Annual
Contributions	`MinorityInterestIncreaseDecreaseFromCapitalContributionFromNoncontrollingInterestHolders`	$214.00M	USD	Annual
Contributions	`MinorityInterestIncreaseDecreaseFromCapitalContributionFromNoncontrollingInterestHolders`	$214.00M	USD	Annual
Distributions	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$379.00M	USD	Annual
Distributions	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$379.00M	USD	Annual
Distributions	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$30.00M	USD	Annual
Distributions	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$30.00M	USD	Annual
Distributions	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$49.00M	USD	Annual
Distributions	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$49.00M	USD	Annual
Acquisition of noncontrolling interest (C)	`AcquisitionOfNoncontrollingInterest`	$-193.00M	USD	Annual
Acquisition of noncontrolling interest (C)	`AcquisitionOfNoncontrollingInterest`	$-193.00M	USD	Annual
Other	`StockholdersEquityOther`	$1.00M	USD	Annual
Other	`StockholdersEquityOther`	$1.00M	USD	Annual
Other	`StockholdersEquityOther`	$1.00M	USD	Annual
Other	`StockholdersEquityOther`	$1.00M	USD	Annual
Other	`StockholdersEquityOther`	$1.00M	USD	Annual
Other	`StockholdersEquityOther`	$1.00M	USD	Annual
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.84B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.84B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.59B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.59B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.16B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.16B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.28B	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.28B	USD	Point-in-time

Comprehensive Income 108 line items

Line Item	Tag	Value	Unit	Period
Net income (loss) attributable to Alcoa Corporation	`NetIncomeLoss`	$-123.00M	USD	Annual
Net income (loss) attributable to Alcoa Corporation	`NetIncomeLoss`	$-123.00M	USD	Annual
Net income (loss) attributable to Alcoa Corporation	`NetIncomeLoss`	$-651.00M	USD	Annual
Net income (loss) attributable to Alcoa Corporation	`NetIncomeLoss`	$-651.00M	USD	Annual
Net income (loss) attributable to Alcoa Corporation	`NetIncomeLoss`	$60.00M	USD	Annual
Net income (loss) attributable to Alcoa Corporation	`NetIncomeLoss`	$60.00M	USD	Annual
Net income (loss) , Noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-36.00M	USD	Annual
Net income (loss) , Noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-36.00M	USD	Annual
Net income (loss) , Noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$161.00M	USD	Annual
Net income (loss) , Noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$161.00M	USD	Annual
Net income (loss) , Noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-122.00M	USD	Annual
Net income (loss) , Noncontrolling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$-122.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$24.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$24.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$38.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$38.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$-773.00M	USD	Annual
Net income (loss)	`ProfitLoss`	$-773.00M	USD	Annual
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Alcoa Corporation	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent`	$944.00M	USD	Annual
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Alcoa Corporation	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent`	$944.00M	USD	Annual
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Alcoa Corporation	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent`	$-62.00M	USD	Annual
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Alcoa Corporation	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent`	$-62.00M	USD	Annual
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Alcoa Corporation	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent`	-	USD	Annual
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Alcoa Corporation	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent`	-	USD	Annual
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Noncontrolling interest	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$8.00M	USD	Annual
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Noncontrolling interest	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$8.00M	USD	Annual
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	Annual
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	Annual
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Noncontrolling interest	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$-10.00M	USD	Annual
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits, Noncontrolling interest	`OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$-10.00M	USD	Annual
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-72.00M	USD	Annual
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-72.00M	USD	Annual
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$4.00M	USD	Annual
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$4.00M	USD	Annual
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$952.00M	USD	Annual
Change in unrecognized net actuarial gain/loss and prior service cost/benefit related to pension and other postretirement benefits	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$952.00M	USD	Annual
Foreign currency translation adjustments, Alcoa Corporation	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent`	$-513.00M	USD	Annual
Foreign currency translation adjustments, Alcoa Corporation	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent`	$-513.00M	USD	Annual
Foreign currency translation adjustments, Alcoa Corporation	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent`	$-71.00M	USD	Annual
Foreign currency translation adjustments, Alcoa Corporation	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent`	$-71.00M	USD	Annual
Foreign currency translation adjustments, Alcoa Corporation	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent`	$92.00M	USD	Annual
Foreign currency translation adjustments, Alcoa Corporation	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent`	$92.00M	USD	Annual
Foreign currency translation adjustments, Noncontrolling interest	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$-103.00M	USD	Annual
Foreign currency translation adjustments, Noncontrolling interest	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$-103.00M	USD	Annual
Foreign currency translation adjustments, Noncontrolling interest	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$-105.00M	USD	Annual
Foreign currency translation adjustments, Noncontrolling interest	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$-105.00M	USD	Annual
Foreign currency translation adjustments, Noncontrolling interest	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$57.00M	USD	Annual
Foreign currency translation adjustments, Noncontrolling interest	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest`	$57.00M	USD	Annual
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-618.00M	USD	Annual
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-618.00M	USD	Annual
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-174.00M	USD	Annual
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-174.00M	USD	Annual
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$149.00M	USD	Annual
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$149.00M	USD	Annual
Net change in unrecognized gains/losses on cash flow hedges, Alcoa Corporation	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent`	$180.00M	USD	Annual
Net change in unrecognized gains/losses on cash flow hedges, Alcoa Corporation	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent`	$180.00M	USD	Annual
Net change in unrecognized gains/losses on cash flow hedges, Alcoa Corporation	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent`	$147.00M	USD	Annual
Net change in unrecognized gains/losses on cash flow hedges, Alcoa Corporation	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent`	$147.00M	USD	Annual
Net change in unrecognized gains/losses on cash flow hedges, Alcoa Corporation	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent`	$-136.00M	USD	Annual
Net change in unrecognized gains/losses on cash flow hedges, Alcoa Corporation	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent`	$-136.00M	USD	Annual
Net change in unrecognized gains/losses on cash flow hedges, Noncontrolling interest	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxNoncontrollingInterest`	-	USD	Annual
Net change in unrecognized gains/losses on cash flow hedges, Noncontrolling interest	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxNoncontrollingInterest`	-	USD	Annual
Net change in unrecognized gains/losses on cash flow hedges, Noncontrolling interest	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxNoncontrollingInterest`	$2.00M	USD	Annual
Net change in unrecognized gains/losses on cash flow hedges, Noncontrolling interest	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxNoncontrollingInterest`	$2.00M	USD	Annual
Net change in unrecognized gains/losses on cash flow hedges, Noncontrolling interest	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxNoncontrollingInterest`	$-1.00M	USD	Annual
Net change in unrecognized gains/losses on cash flow hedges, Noncontrolling interest	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxNoncontrollingInterest`	$-1.00M	USD	Annual
Net change in unrecognized gains/losses on cash flow hedges	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax`	$182.00M	USD	Annual
Net change in unrecognized gains/losses on cash flow hedges	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax`	$182.00M	USD	Annual
Net change in unrecognized gains/losses on cash flow hedges	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax`	$-137.00M	USD	Annual
Net change in unrecognized gains/losses on cash flow hedges	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax`	$-137.00M	USD	Annual
Net change in unrecognized gains/losses on cash flow hedges	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax`	$147.00M	USD	Annual
Net change in unrecognized gains/losses on cash flow hedges	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax`	$147.00M	USD	Annual
Total Other comprehensive (loss) income, net of tax, Alcoa Corporation	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-106.00M	USD	Annual
Total Other comprehensive (loss) income, net of tax, Alcoa Corporation	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-106.00M	USD	Annual
Total Other comprehensive (loss) income, net of tax, Alcoa Corporation	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$1.05B	USD	Annual
Total Other comprehensive (loss) income, net of tax, Alcoa Corporation	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$1.05B	USD	Annual
Total Other comprehensive (loss) income, net of tax, Alcoa Corporation	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-366.00M	USD	Annual
Total Other comprehensive (loss) income, net of tax, Alcoa Corporation	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-366.00M	USD	Annual
Total Other comprehensive (loss) income, net of tax, Noncontrolling interest	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$-93.00M	USD	Annual
Total Other comprehensive (loss) income, net of tax, Noncontrolling interest	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$-93.00M	USD	Annual
Total Other comprehensive (loss) income, net of tax, Noncontrolling interest	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$46.00M	USD	Annual
Total Other comprehensive (loss) income, net of tax, Noncontrolling interest	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$46.00M	USD	Annual
Total Other comprehensive (loss) income, net of tax, Noncontrolling interest	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$-101.00M	USD	Annual
Total Other comprehensive (loss) income, net of tax, Noncontrolling interest	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$-101.00M	USD	Annual
Total Other comprehensive (loss) income, net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$960.00M	USD	Annual
Total Other comprehensive (loss) income, net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$960.00M	USD	Annual
Total Other comprehensive (loss) income, net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$-60.00M	USD	Annual
Total Other comprehensive (loss) income, net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$-60.00M	USD	Annual
Total Other comprehensive (loss) income, net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$-467.00M	USD	Annual
Total Other comprehensive (loss) income, net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$-467.00M	USD	Annual
Comprehensive (loss) income, Alcoa Corporation	`ComprehensiveIncomeNetOfTax`	$-306.00M	USD	Annual
Comprehensive (loss) income, Alcoa Corporation	`ComprehensiveIncomeNetOfTax`	$-306.00M	USD	Annual
Comprehensive (loss) income, Alcoa Corporation	`ComprehensiveIncomeNetOfTax`	$930.00M	USD	Annual
Comprehensive (loss) income, Alcoa Corporation	`ComprehensiveIncomeNetOfTax`	$930.00M	USD	Annual
Comprehensive (loss) income, Alcoa Corporation	`ComprehensiveIncomeNetOfTax`	$-757.00M	USD	Annual
Comprehensive (loss) income, Alcoa Corporation	`ComprehensiveIncomeNetOfTax`	$-757.00M	USD	Annual
Comprehensive (loss) income, Noncontrolling interest	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-76.00M	USD	Annual
Comprehensive (loss) income, Noncontrolling interest	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-76.00M	USD	Annual
Comprehensive (loss) income, Noncontrolling interest	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$68.00M	USD	Annual
Comprehensive (loss) income, Noncontrolling interest	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$68.00M	USD	Annual
Comprehensive (loss) income, Noncontrolling interest	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-137.00M	USD	Annual
Comprehensive (loss) income, Noncontrolling interest	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-137.00M	USD	Annual
Comprehensive (loss) income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$998.00M	USD	Annual
Comprehensive (loss) income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$998.00M	USD	Annual
Comprehensive (loss) income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$-443.00M	USD	Annual
Comprehensive (loss) income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$-443.00M	USD	Annual
Comprehensive (loss) income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$-833.00M	USD	Annual
Comprehensive (loss) income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$-833.00M	USD	Annual

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