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Other Income, Net (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2013
Schedule of Other Income, Net | Other Income, Net
|  | First quarter ended March 31, |
|  | 2013 |  |  | 2012 |
Equity loss |  | $ | 12 |  |  | $ | 2 |
Interest income |  |  | (4 | ) |  |  | (6 | )
Foreign currency gains, net |  |  | (6 | ) |  |  | (11 | )
Net (gain) loss from asset sales |  |  | (5 | ) |  |  | 2 |
Net (gain) loss on mark-to-market derivative contracts (M) |  |  | (17 | ) |  |  | 6 |
Other, net |  |  | (7 | ) |  |  | (9 | )
|  | $ | (27 | ) |  | $ | (16 | )

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- Definition Provides a description and amount of each detailed component of other nonoperating income and expenses. The description provided for other nonoperating income may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items. The description provided for other nonoperating expenses may include: (a) losses on securities (net of profits) and (b) miscellaneous income deductions. + References No definition available. + Details
Name: | aa_ComponentOfOtherIncomeExpenseNonoperatingTableTextBlock
Namespace Prefix: | aa_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration