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Schedule Of Segment Reporting Information To Consolidated Net Income Attributable To Alcoa (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Segment Reporting Information [Line Items] |  |  |  |
Total segment ATOI | $ 275 | $ 635 | $ 571 | $ 1,190
Interest expense | (123) | (163) | (246) | (274)
Noncontrolling interests | 17 | (55) | 12 | (113)
Discontinued operations |  | (4) |  | (5)
Consolidated net (loss) income attributable to Alcoa | (2) | 322 | 92 | 630
Unallocated Amounts (Net Of Tax) |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Impact of LIFO | 19 | (27) | 19 | (51)
Interest expense | (80) | (106) | (160) | (178)
Noncontrolling interests | 17 | (55) | 12 | (113)
Corporate expense | (69) | (76) | (133) | (143)
Restructuring and other charges | (10) | (22) | (17) | (28)
Discontinued operations |  | (4) |  | (5)
Other | $ (154) | $ (23) | $ (200) | $ (42)

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