XML 31 R49.htm IDEA: XBRL DOCUMENT v2.4.1.9
Receivables - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2015
Agreement
Dec. 31, 2014
Schedule Of Financial Receivables [Line Items]      
Number of arrangement with different financial institution to sell customer receivables   3aa_NumberOfArrangementsToSellCustomerReceivables  
Net cash funding received in current period   $ 0aa_AmountIncludedInCommitmentOfAdditionalFundingForDevelopmentOfReserves  
Deferred purchase price receivable 254,000,000aa_DeferredPriceCustomerReceivables 417,000,000aa_DeferredPriceCustomerReceivables 356,000,000aa_DeferredPriceCustomerReceivables
Net cash funding received   250,000,000aa_CommitmentOfAdditionalFundingForDevelopmentOfReserves  
Amount of cash draws under arrangement   1,308,000,000aa_ProceedsFromReceivableFunding  
Amount of cash repayments under arrangement   1,058,000,000aa_RepaymentsForReceivableFunding  
Accounts receivables   19,545,000,000us-gaap_AccountsReceivableGross  
Cash collections of other receivables   18,878,000,000us-gaap_ProceedsFromCollectionOfOtherReceivables  
Minimum [Member]      
Schedule Of Financial Receivables [Line Items]      
Funding of customer receivables sold   200,000,000aa_FundingOfCustomerReceivablesSold
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Maximum [Member]      
Schedule Of Financial Receivables [Line Items]      
Funding of customer receivables sold   $ 500,000,000aa_FundingOfCustomerReceivablesSold
/ us-gaap_RangeAxis
= us-gaap_MaximumMember