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Other Expenses (Income), Net (Tables) | 6 Months Ended
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Jun. 30, 2013
Other Income And Expenses [Abstract] |
Schedule of Other Income, Net | Other Expenses (Income), Net
|  | Second quarter ended June 30, |  |  | Six months ended June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Equity loss |  | $ | 10 |  |  | $ | 10 |  |  | $ | 22 |  |  | $ | 12 |
Interest income |  |  | (4 | ) |  |  | (4 | ) |  |  | (8 | ) |  |  | (10 | )
Foreign currency (gains) losses, net |  |  | (5 | ) |  |  | 11 |  |  |  | (11 | ) |  |  | (1 | )
Net (gain) loss from asset sales |  |  | (1 | ) |  |  | (1 | ) |  |  | (6 | ) |  |  | 1 |
Net loss (gain) on mark-to-market derivative contracts (M) |  |  | 16 |  |  |  | 2 |  |  |  | (1 | ) |  |  | 9 |
Other, net |  |  | 3 |  |  |  | 4 |  |  |  | (4 | ) |  |  | (5 | )
|  | $ | 19 |  |  | $ | 22 |  |  | $ | (8 | ) |  | $ | 6 |

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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

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