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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Inventory Components |
December 31, |  | 2012 |  |  | 2011 |
Finished goods |  | $ | 542 |  |  | $ | 537 |
Work-in-process |  |  | 866 |  |  |  | 911 |
Bauxite and alumina |  |  | 618 |  |  |  | 656 |
Purchased raw materials |  |  | 536 |  |  |  | 532 |
Operating supplies |  |  | 263 |  |  |  | 263 |
|  | $ | 2,825 |  |  | $ | 2,899 |

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- Definition Disclosure of the carrying value of each significant component of inventory for an entity, who does not report such information on the face of their balance sheet. + References No definition available. + Details
Name: | aa_ScheduleOfInventoryComponentsDisclosuresTableTextBlock
Namespace Prefix: | aa_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration