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Segment Information - Schedule of Segment Reporting Information to Consolidated Net Income Attributable to Alcoa (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Total segment ATOI | $ 235 |  | $ 462 |  | $ 806 |  | $ 1,652 |
Interest expense | (124) |  | (125) |  | (370) |  | (399) |
Noncontrolling interests | 32 |  | (53) |  | 44 |  | (166) |
Discontinued operations |  |  |  |  |  |  | (5) |
Consolidated net (loss) income attributable to Alcoa | (143) |  | 172 |  | (51) |  | 802 |
Environmental remediation charges | 116 |  |  |  | 129 |  |  |
Civil litigation matter | 26 |  |  |  | 55 |  |  |
Unallocated Amounts (Net Of Tax) [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Impact of LIFO | (7) |  | 2 |  | 12 |  | (49) |
Interest expense | (81) |  | (81) |  | (241) |  | (259) |
Noncontrolling interests | 32 |  | (53) |  | 44 |  | (166) |
Corporate expense | (62) |  | (76) |  | (195) |  | (219) |
Restructuring and other charges | (2) |  | (7) |  | (19) |  | (35) |
Discontinued operations |  |  |  |  |  |  | (5) |
Other* | $ (258) | [1] | $ (75) | [1] | $ (458) | [1] | $ (117) | [1]
[1] | In the third quarter and nine-month period of 2012, Other includes after-tax charges related to environmental remediation ($116 and $129) and a civil litigation matter ($26 and $55), respectively, (see Note G).

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