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Segment Information - Schedule of Segment ATOI to Consolidated Net Income Attributable to Alcoa (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Segment Reporting Information [Line Items] |  |
Total segment ATOI | $ 351 | $ 304
Interest expense | (115) | (123)
Noncontrolling interests | (21) | (5)
Consolidated net income attributable to Alcoa | 149 | 94
Unallocated amounts (net of tax) [Member] |  |
Segment Reporting Information [Line Items] |  |
Impact of LIFO | (2) |
Interest expense | (75) | (80)
Noncontrolling interests | (21) | (5)
Corporate expense | (67) | (64)
Restructuring and other charges | (5) | (7)
Other | $ (32) | $ (54)

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