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Acquisitions and Divestitures - Additional Information (Detail)
 3 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2014
Corporate [Member]
USD ($)
Dec. 31, 2013
Corporate [Member]
USD ($)
Dec. 31, 2012
Corporate [Member]
USD ($)
Nov. 19, 2014
Firth Rixson [Member]
USD ($)
Jun. 30, 2014
Firth Rixson [Member]
USD ($)
Dec. 31, 2014
Firth Rixson [Member]
USD ($)
Employees
Facilities
Nov. 19, 2014
Firth Rixson [Member]
USD ($)
Aug. 31, 2014
Aluminum Brazing Sheet [Member]
USD ($)
Dec. 31, 2014
Tital [Member]
USD ($)
Employees
Dec. 31, 2014
Tital [Member]
EUR (€)
Dec. 31, 2014
2014 Divestitures [Member]
USD ($)
Dec. 31, 2013
Aluminum Rod Plant [Member]
USD ($)
Employees
Dec. 31, 2014
Maximum [Member]
Jun. 30, 2014
Maximum [Member]
Firth Rixson [Member]
USD ($)
Dec. 31, 2014
Alcoa [Member]
Dec. 31, 2014
Alcoa World Alumina and Chemicals [Member]
USD ($)
Employees
t
Dec. 31, 2013
Mt Holly Smelter [Member]
USD ($)
t
Employees
Dec. 31, 2014
Mt Holly Smelter [Member]
Dec. 31, 2014
Atlas Holdings Llc [Member]
Mills
Dec. 31, 2013
Atlas Holdings Llc [Member]
USD ($)
Employees
Dec. 31, 2014
Russia [Member]
Facility
Nov. 30, 2012
351 - Megawatt Tapoco Hydroelectric Project [Member]
USD ($)
acre
mi
ElectricStation
Nov. 30, 2012
351 - Megawatt Tapoco Hydroelectric Project [Member]
Primary Metals Segment [Member]
USD ($)
Nov. 30, 2012
351 - Megawatt Tapoco Hydroelectric Project [Member]
Corporate [Member]
USD ($)
Business Acquisition [Line Items]                                                        
Business acquisition purchase price               $ 2,995,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		 $ 2,850,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		                                      
Cash paid for business acquisition   2,458,000,000us-gaap_PaymentsToAcquireBusinessesGross 0us-gaap_PaymentsToAcquireBusinessesGross 0us-gaap_PaymentsToAcquireBusinessesGross       2,385,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		 2,350,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		       235,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= aa_TitalMember		 194,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= aa_TitalMember		                            
Value of common stock issued               610,000,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		 500,000,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		                                      
Business acquisition potential earn-out                                   150,000,000aa_BusinessAcquisitionCostOfAcquiredEntityPotentialCashEarnOuts
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                    
Common stock issued as part of acquisition                 36,523,010us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		                                      
Business acquisition agreement date                 Dec. 31, 2020                                      
Business acquisition transaction cost                     35,000,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		                                  
Business acquisition common stock issued, price per share                     $ 16.69us-gaap_SaleOfStockPricePerShare
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		                                  
Professional fees and costs                 42,000,000us-gaap_ProfessionalFees
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		                                      
Professional fees and costs , after tax                 34,000,000aa_ProfessionalServiceFeesRelatedToMergerTransactionNetOfTaxes
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		                                      
Interest expenses   473,000,000us-gaap_InterestExpense 453,000,000us-gaap_InterestExpense 490,000,000us-gaap_InterestExpense         13,000,000us-gaap_InterestExpense
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		                                      
Interest expenses, after tax                 8,000,000aa_DebtInterestExpenseNet
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		                                      
Business acquisition, unsecured bridge term loan                 2,500,000,000us-gaap_BridgeLoan
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		                                      
Number of operating facilities                   13aa_NumberOfOperatingFacilities
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		                                    
Number of employees                   2,400aa_NumberOfEmployees
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		     650aa_NumberOfEmployees
/ us-gaap_BusinessAcquisitionAxis
= aa_TitalMember		 650aa_NumberOfEmployees
/ us-gaap_BusinessAcquisitionAxis
= aa_TitalMember		   60aa_NumberOfEmployees
/ us-gaap_BusinessAcquisitionAxis
= aa_AluminumRodPlantMember		       500aa_NumberOfEmployees
/ us-gaap_OtherOwnershipInterestsByNameAxis
= aa_AlcoaWorldAluminaAndChemicalsMember		 250aa_NumberOfEmployees
/ us-gaap_OtherOwnershipInterestsByNameAxis
= aa_MtHollySmelterMember		     750aa_NumberOfEmployees
/ us-gaap_OtherOwnershipInterestsByNameAxis
= aa_AtlasHoldingsLlcMember		        
Business acquisition sales                   81,000,000us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		                                    
Operating income after tax                   (12,000,000)us-gaap_OperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		                                    
Goodwill 5,247,000,000us-gaap_Goodwill 5,247,000,000us-gaap_Goodwill 3,415,000,000us-gaap_Goodwill 5,170,000,000us-gaap_Goodwill 510,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 518,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 1,272,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		     1,898,000,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		                                    
Income tax expense   320,000,000us-gaap_IncomeTaxExpenseBenefit 428,000,000us-gaap_IncomeTaxExpenseBenefit 162,000,000us-gaap_IncomeTaxExpenseBenefit           0us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		                                    
Business acquisition potential earn-out                   150,000,000aa_BusinessAcquisitionContingentEarnOutLiability
/ us-gaap_BusinessAcquisitionAxis
= aa_FirthRixsonMember		                                    
Business combination contingent consideration earnout period description                   2017 through 2019                                    
Percentage of outstanding non controlling interest                       30.00%aa_BusinessAcquisitionOfOutstandingNoncontrollingInterestPercentage
/ us-gaap_BusinessAcquisitionAxis
= aa_AluminumBrazingSheetMember		                                
Amount of outstanding non controlling interest                       28,000,000aa_BusinessAcquisitionPurchasePriceAllocationMinorityInterest
/ us-gaap_BusinessAcquisitionAxis
= aa_AluminumBrazingSheetMember		                                
Difference between carrying value and fair value in acquisition of non-controlling interest                       3,000,000us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity
/ us-gaap_BusinessAcquisitionAxis
= aa_AluminumBrazingSheetMember		                                
Net cash proceeds                             247,000,000us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
/ us-gaap_BusinessAcquisitionAxis
= aa_TwoThousandFourteenDivestituresMember		                          
Loss from divestitures before income tax 332,000,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax                           332,000,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_BusinessAcquisitionAxis
= aa_TwoThousandFourteenDivestituresMember		                          
Net loss , after tax and noncontrolling interest 163,000,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax                           163,000,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_BusinessAcquisitionAxis
= aa_TwoThousandFourteenDivestituresMember		                          
Sale generated in last annual period prior to divestiture                               200,000,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_BusinessAcquisitionAxis
= aa_AluminumRodPlantMember		       200us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_OtherOwnershipInterestsByNameAxis
= aa_AlcoaWorldAluminaAndChemicalsMember		 280,000,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_OtherOwnershipInterestsByNameAxis
= aa_MtHollySmelterMember		     500,000,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_OtherOwnershipInterestsByNameAxis
= aa_AtlasHoldingsLlcMember		        
Percent of equity investments in other entity 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage                             50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		   60.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_OtherOwnershipInterestsByNameAxis
= us-gaap_ParentCompanyMember		 55.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_OtherOwnershipInterestsByNameAxis
= aa_AlcoaWorldAluminaAndChemicalsMember		   50.33%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_OtherOwnershipInterestsByNameAxis
= aa_MtHollySmelterMember		            
Plant capacity, in metric tons per year                                       778,800aa_ExpectedPlantCapacity
/ us-gaap_OtherOwnershipInterestsByNameAxis
= aa_AlcoaWorldAluminaAndChemicalsMember		 115,000aa_ExpectedPlantCapacity
/ us-gaap_OtherOwnershipInterestsByNameAxis
= aa_MtHollySmelterMember		              
Number of rolling mills                                             3aa_NumberOfMillsLocated
/ us-gaap_OtherOwnershipInterestsByNameAxis
= aa_AtlasHoldingsLlcMember		          
Sale of energy                                                   597,000,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aa_ThreeHundredFiftyOneMegawattTapocoHydroelectricProjectMember		    
Gain (loss) on sale of business   (332,000,000)us-gaap_GainLossOnSaleOfBusiness                                               320,000,000us-gaap_GainLossOnSaleOfBusiness
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aa_ThreeHundredFiftyOneMegawattTapocoHydroelectricProjectMember		 426,000,000us-gaap_GainLossOnSaleOfBusiness
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aa_ThreeHundredFiftyOneMegawattTapocoHydroelectricProjectMember
/ us-gaap_StatementBusinessSegmentsAxis
= aa_PrimaryMetalsSegmentMember		 (106,000,000)us-gaap_GainLossOnSaleOfBusiness
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aa_ThreeHundredFiftyOneMegawattTapocoHydroelectricProjectMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
Gain (loss) on sale of business, after tax                                                   173,000,000aa_GainLossOnSaleOfBusinessNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aa_ThreeHundredFiftyOneMegawattTapocoHydroelectricProjectMember		 275,000,000aa_GainLossOnSaleOfBusinessNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aa_ThreeHundredFiftyOneMegawattTapocoHydroelectricProjectMember
/ us-gaap_StatementBusinessSegmentsAxis
= aa_PrimaryMetalsSegmentMember		 (102,000,000)aa_GainLossOnSaleOfBusinessNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aa_ThreeHundredFiftyOneMegawattTapocoHydroelectricProjectMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
Number of hydroelectric generating stations and dams                                                   4aa_NumberOfHydroelectricGeneratingStationsAndDams
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aa_ThreeHundredFiftyOneMegawattTapocoHydroelectricProjectMember		    
Length of transmission line                                                   86aa_LengthOfTransmissionLine
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aa_ThreeHundredFiftyOneMegawattTapocoHydroelectricProjectMember		    
Acres of land associated with divestitures                                                   14,500aa_AcresOfLand
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aa_ThreeHundredFiftyOneMegawattTapocoHydroelectricProjectMember		    
Allocation of goodwill                                                   (94,000,000)us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aa_ThreeHundredFiftyOneMegawattTapocoHydroelectricProjectMember		    
Additional contingent consideration payable   $ 50,000,000aa_BusinessAcquisitionAdditionalContingentConsiderationPotentialCashPayment                                                    
Number of facilities acquired                                                 2aa_NumberOfFacilitiesAcquired
/ invest_InvestmentGeographicRegionAxis
= country_RU