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Other Income, Net (Tables) | 3 Months Ended
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Mar. 31, 2012
Other Income, Net [Abstract] |
Schedule Of Other Income, Net |
|  | First quarter ended March 31, |
|  | 2012 |  |  | 2011 |
Equity loss (income) |  | $ | 2 |  |  | $ | (4 | )
Interest income |  |  | (6 | ) |  |  | (6 | )
Foreign currency gains, net |  |  | (11 | ) |  |  | (21 | )
Net loss from asset sales |  |  | 2 |  |  |  | 1 |
Net loss (gain) on mark-to-market derivative contracts (L) |  |  | 6 |  |  |  | (9 | )
Other, net |  |  | (9 | ) |  |  | 11 |
|  | $ | (16 | ) |  | $ | (28 | )

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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
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Namespace Prefix: | aa_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration