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Contingencies and Commitments (Tables) (Alba [Member]) | 12 Months Ended
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Dec. 31, 2013
Alba [Member] |
Summary of Activity Related to Alba Matter | The following table details the activity related to the Alba matter:
|  | 2013 |  |  | 2012 |
|  | Alcoa |  |  | Alumina Limited |  |  | Total |  |  | Alcoa |  |  | Alumina Limited |  |  | Total |
Government investigations(1) |  | $ | 326 |  |  | $ | 58 |  |  | $ | 384 |  |  | $ | - |  |  | $ | - |  |  | $ | - |
Civil suit(1) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 51 |  |  |  | 34 |  |  |  | 85 |
Reallocation of civil suit |  |  | 21 |  |  |  | (21 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Reallocation of legal costs |  |  | 20 |  |  |  | (20 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Loss before income taxes |  |  | 367 |  |  |  | 17 |  |  |  | 384 |  |  |  | 51 |  |  |  | 34 |  |  |  | 85 |
Benefit for income taxes |  |  | 66 |  |  |  | - |  |  |  | 66 |  |  |  | 18 |  |  |  | - |  |  |  | 18 |
Net loss(2) |  | $ | 301 |  |  | $ | 17 |  |  | $ | 318 |  |  | $ | 33 |  |  | $ | 34 |  |  | $ | 67 |
(1) | The amount in the Total column was recorded in Restructuring and other charges (see Note D).
(2) | In 2013 and 2012, the amount for Alcoa was included in Net (loss) income attributable to Alcoa, and the amount for Alumina Limited was included in Net income (loss) attributable to noncontrolling interests.

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- Definition Litigation Settlement Table [Text Block] + References No definition available. + Details
Name: | aa_LitigationSettlementTableTextBlock
Namespace Prefix: | aa_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration