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Segment and Geographic Area Information - Schedule of Segment Reporting Information to Consolidated Net Income Attributable to Alcoa (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total segment ATOI |  |  |  |  |  |  |  |  | $ 1,369 | $ 1,893 | $ 1,424
Interest expense |  |  |  |  |  |  |  |  | (490) | (524) | (494)
Noncontrolling interests |  |  |  |  |  |  |  |  | 29 | (194) | (138)
Discontinued operations |  |  |  |  |  |  |  |  |  | (3) | (8)
Consolidated net income attributable to Alcoa | 242 | (143) | (2) | 94 | (191) | 172 | 322 | 308 | 191 | 611 | 254
Unallocated Amounts (Net of Tax) [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impact of LIFO |  |  |  |  |  |  |  |  | 20 | (38) | (16)
Interest expense |  |  |  |  |  |  |  |  | (319) | (340) | (321)
Noncontrolling interests |  |  |  |  |  |  |  |  | 29 | (194) | (138)
Corporate expense |  |  |  |  |  |  |  |  | (282) | (290) | (291)
Restructuring and other charges |  |  |  |  |  |  |  |  | (75) | (196) | (134)
Discontinued operations |  |  |  |  |  |  |  |  |  | (3) | (8)
Other |  |  |  |  |  |  |  |  | $ (551) | $ (221) | $ (262)

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