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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |
Total segment ATOI | $ 619 | $ 338 | $ 1,362 | $ 993
Interest expense | (126) | (108) | (351) | (341)
Noncontrolling interests | (18) | 20 | (46) | 12
NET INCOME ATTRIBUTABLE TO ALCOA | 149 | 24 | 109 | 54
Unallocated Amounts (Net of Tax) [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Impact of LIFO | (18) | 9 | (33) | 12
Interest expense | (81) | (70) | (228) | (221)
Noncontrolling interests | 18 | (20) | 46 | (12)
Corporate expense | (74) | (74) | (211) | (212)
Restructuring and other charges | (189) | (108) | (587) | (324)
Other | $ (126) | $ (51) | $ (240) | $ (182)

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