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Acquisitions and Divestitures - Additional Information (Detail) In Millions, except Share data, unless otherwise specified |  |  | 3 Months Ended | 0 Months Ended | 3 Months Ended |  | 3 Months Ended | 12 Months Ended |  |  | 3 Months Ended
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Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Mar. 31, 2015 Stupino Titanium Company [Member] USD ($) Employees | Mar. 31, 2015 Russia [Member] USD ($) | Nov. 30, 2014 Firth Rixson [Member] USD ($) | Mar. 31, 2015 Firth Rixson [Member] USD ($) | Nov. 30, 2014 Firth Rixson [Member] USD ($) | Mar. 31, 2015 Firth Rixson [Member] Goodwill [Member] USD ($) | Mar. 31, 2015 Tital [Member] USD ($) Employees | Mar. 31, 2015 Tital [Member] EUR (€) | Dec. 31, 2014 RTI [Member] USD ($) Employees | Mar. 31, 2015 RTI [Member] USD ($) | Mar. 06, 2015 RTI [Member] USD ($) | Mar. 31, 2015 RTI [Member] Senior Notes [Member] Convertible Debt [Member] USD ($) Series
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition purchase price |  |  |  |  | $ 2,995 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = aa_FirthRixsonMember |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  | 130 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContingentLiability / us-gaap_BusinessAcquisitionAxis = aa_FirthRixsonMember |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  | 3,470 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = aa_FirthRixsonMember |  |  |  |  |  |  |
Goodwill | 5,050 us-gaap_Goodwill | 5,247 us-gaap_Goodwill |  |  |  |  | 1,898 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = aa_FirthRixsonMember |  | 123 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = aa_TitalMember |  |  |  |  |
Intangible assets |  |  |  |  |  | 968 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = aa_FirthRixsonMember | 398 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = aa_FirthRixsonMember |  |  |  |  |  |  |
Total liabilities |  |  |  |  |  |  | 475 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = aa_FirthRixsonMember |  |  |  |  |  |  |
Properties, plants and equipment |  |  |  |  |  | 135 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = aa_FirthRixsonMember |  |  |  |  |  |  |  |
Decrease in goodwill |  |  |  |  |  | 570 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles / us-gaap_BusinessAcquisitionAxis = aa_FirthRixsonMember |  | (275)us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles / us-gaap_BusinessAcquisitionAxis = aa_FirthRixsonMember / us-gaap_FairValueByAssetClassAxis = us-gaap_GoodwillMember |  |  |  |  |  |
Number of employees |  |  | 1,870 aa_NumberOfEmployees / us-gaap_FairValueByAssetClassAxis = aa_StupinoTitaniumMember |  |  |  |  |  | 650 aa_NumberOfEmployees / us-gaap_BusinessAcquisitionAxis = aa_TitalMember | 650 aa_NumberOfEmployees / us-gaap_BusinessAcquisitionAxis = aa_TitalMember | 2,600 aa_NumberOfEmployees / us-gaap_BusinessAcquisitionAxis = aa_RTIMember |  |  |
Cash paid for business acquisition |  |  |  |  |  |  |  |  | 204 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = aa_TitalMember | 188 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = aa_TitalMember |  |  |  |
Common stock estimated value | 1,304 us-gaap_CommonStockValue | 1,304 us-gaap_CommonStockValue |  |  |  |  |  |  |  |  |  | 1,100 us-gaap_CommonStockValue / us-gaap_BusinessAcquisitionAxis = aa_RTIMember |  |
Business acquisition common stock issued, price per share |  |  |  |  |  |  |  |  |  |  |  | $ 12.92 us-gaap_SaleOfStockPricePerShare / us-gaap_BusinessAcquisitionAxis = aa_RTIMember | $ 14.48 us-gaap_SaleOfStockPricePerShare / us-gaap_BusinessAcquisitionAxis = aa_RTIMember |
Number of shares to be issued upon conversion |  |  |  |  |  |  |  |  |  |  |  | $ 2.8315 aa_BusinessCombinationNumberOfSharesToBeIssuedUponConversion / us-gaap_BusinessAcquisitionAxis = aa_RTIMember |  |
Acquisition price per share |  |  |  |  |  |  |  |  |  |  |  |  | $ 41 us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = aa_RTIMember |
Common stock outstanding |  |  |  |  |  |  |  |  |  |  |  | 30,794,405 us-gaap_CommonStockSharesOutstanding / us-gaap_BusinessAcquisitionAxis = aa_RTIMember |  |
Assumed debt |  |  |  |  |  |  |  |  |  |  |  | 500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilities / us-gaap_BusinessAcquisitionAxis = aa_RTIMember |  | 500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilities / us-gaap_BusinessAcquisitionAxis = aa_RTIMember / us-gaap_ExtinguishmentOfDebtAxis = us-gaap_ConvertibleDebtMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Business acquisition cash assumed |  |  |  |  |  |  |  |  |  |  |  | 300 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = aa_RTIMember |  |
Number of additional series |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 aa_NumberOfAdditionalSeries / us-gaap_BusinessAcquisitionAxis = aa_RTIMember / us-gaap_ExtinguishmentOfDebtAxis = us-gaap_ConvertibleDebtMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Conversion of convertible senior notes to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | (13,070,774)us-gaap_ConversionOfStockSharesIssued1 / us-gaap_BusinessAcquisitionAxis = aa_RTIMember / us-gaap_ExtinguishmentOfDebtAxis = us-gaap_ConvertibleDebtMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Generated sale,net |  |  | 130 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_FairValueByAssetClassAxis = aa_StupinoTitaniumMember |  |  |  |  |  |  |  | 794 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_BusinessAcquisitionAxis = aa_RTIMember |  |  |
Net cash payment |  |  |  | 8 us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / us-gaap_StatementGeographicalAxis = country_RU |  |  |  |  |  |  |  |  |  |
Loss from divestitures before income tax |  |  |  | 149 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_StatementGeographicalAxis = country_RU |  |  |  |  |  |  |  |  |  |
Net loss, after tax and noncontrolling interest |  |  |  | $ 142 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_StatementGeographicalAxis = country_RU |  |  |  |  |  |  |  |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The amount of liability arising from an inherited contingency (as defined) which has been recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition The amount of financial liabilities assumed (as defined) which have been recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financial Liability -URI http://asc.fasb.org/extlink&oid=6513127 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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