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Segment and Geographic Area Information - Schedule of Segment ATOI to Consolidated Net (Loss) Income Attributable to Alcoa (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Segment Reporting Information [Line Items] |  |
Total segment ATOI | $ 325 | $ 351
Interest expense | (120) | (115)
Noncontrolling interests | (19) | 21
Consolidated net (loss) income attributable to Alcoa | (178) | 149
Unallocated Amounts (Net of Tax) [Member] |  |
Segment Reporting Information [Line Items] |  |
Impact of LIFO | (7) | (2)
Interest expense | (78) | (75)
Noncontrolling interests | 19 | (21)
Corporate expense | (67) | (67)
Restructuring and other charges | (321) | (5)
Other | $ (49) | $ (32)

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