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Inventories (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2013
Schedule of Inventory Components |
|  | March 31, 2013 |  |  | December 31, 2012 |
Finished goods |  | $ | 589 |  |  | $ | 542 |
Work-in-process |  |  | 946 |  |  |  | 866 |
Bauxite and alumina |  |  | 640 |  |  |  | 618 |
Purchased raw materials |  |  | 542 |  |  |  | 536 |
Operating supplies |  |  | 265 |  |  |  | 263 |
|  | $ | 2,982 |  |  | $ | 2,825 |

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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