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Segment Information (Schedule Of Segment Reporting Information To Consolidated Net Income Attributable To Alcoa) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Segment Reporting Information [Line Items] |  |
Total segment ATOI | $ 296 | $ 555
Interest expense | (123) | (111)
Noncontrolling interests | 5 | 58
Discontinued operations |  | (1)
Consolidated net income attributable to Alcoa | 94 | 308
Unallocated Amounts (Net Of Tax) [Member] |  |
Segment Reporting Information [Line Items] |  |
Impact of LIFO |  | (24)
Interest expense | (80) | (72)
Noncontrolling interests | (5) | (58)
Corporate expense | (64) | (67)
Restructuring and other charges | (7) | (6)
Discontinued operations |  | (1)
Other | $ (46) | $ (19)

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