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Receivables - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2014 Agreement
Schedule Of Financial Receivables [Line Items] |  |
Number of arrangement with different financial institution to sell customer receivables |  | 3
Net cash funding received in current period |  | $ 100
Deferred purchase price receivable | 254 | 315
Net cash funding received |  | 310
Amount of cash draws under arrangement |  | 698
Amount of cash repayments under arrangement |  | 388
Accounts receivables |  | 12,064
Cash collections |  | 11,439
Minimum [Member] |  |
Schedule Of Financial Receivables [Line Items] |  |
Funding of customer receivables sold |  | 50
Maximum [Member] |  |
Schedule Of Financial Receivables [Line Items] |  |
Funding of customer receivables sold |  | $ 500

X
- Definition Amount included in commitment of additional funding for development of reserves. + References No definition available. + Details
Name: | aa_AmountIncludedInCommitmentOfAdditionalFundingForDevelopmentOfReserves
Namespace Prefix: | aa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Commitment of additional funding for development of reserves. + References No definition available. + Details
Name: | aa_CommitmentOfAdditionalFundingForDevelopmentOfReserves
Namespace Prefix: | aa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Deferred purchase price customer receivables. + References No definition available. + Details
Name: | aa_DeferredPriceCustomerReceivables
Namespace Prefix: | aa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Funding of customer receivables sold. + References No definition available. + Details
Name: | aa_FundingOfCustomerReceivablesSold
Namespace Prefix: | aa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of arrangements to sell customer receivables. + References No definition available. + Details
Name: | aa_NumberOfArrangementsToSellCustomerReceivables
Namespace Prefix: | aa_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Proceeds from receivable funding. + References No definition available. + Details
Name: | aa_ProceedsFromReceivableFunding
Namespace Prefix: | aa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Repayments for receivable funding. + References No definition available. + Details
Name: | aa_RepaymentsForReceivableFunding
Namespace Prefix: | aa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | aa_ScheduleOfFinancialReceivablesLineItems
Namespace Prefix: | aa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.9) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash inflow associated with the collection of other receivables not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration