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Other (Income) Expenses, Net (Tables) | 12 Months Ended
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Dec. 31, 2012
Other (Income) Expenses, Net | Other (Income) Expenses, Net
|  | 2012 |  |  | 2011 |  |  | 2010 |
Equity loss (income) |  | $ | 28 |  |  | $ | (15 | ) |  | $ | (14 | )
Interest income |  |  | (31 | ) |  |  | (20 | ) |  |  | (19 | )
Foreign currency (gains) losses, net |  |  | (5 | ) |  |  | 16 |  |  |  | 13 |
Net gain from asset sales |  |  | (321 | ) |  |  | (41 | ) |  |  | (9 | )
Net (gain) loss on mark-to-market derivative contracts (X) |  |  | (13 | ) |  |  | (52 | ) |  |  | 37 |
Other, net |  |  | 1 |  |  |  | 25 |  |  |  | (3 | )
|  | $ | (341 | ) |  | $ | (87 | ) |  | $ | 5 |

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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