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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Total segment ATOI | $ 304 | $ 255 | $ 655 | $ 559
Interest expense | (118) | (123) | (233) | (246)
Noncontrolling interests | (29) | (17) | (8) | (12)
Consolidated net (loss) income attributable to Alcoa | (119) | (2) | 30 | 92
Unallocated Amounts (Net of Tax) [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Impact of LIFO | 5 | 19 | 3 | 19
Interest expense | (76) | (80) | (151) | (160)
Noncontrolling interests | 29 | 17 | 8 | 12
Corporate expense | (71) | (69) | (138) | (133)
Restructuring and other charges | (211) | (10) | (216) | (17)
Other | $ (99) | $ (134) | $ (131) | $ (188)

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