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Schedule Of Operating Results And Assets Of Alcoa's Reportable Segments (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | $ 5,887 | $ 6,526 | $ 11,841 | $ 12,455
Intersegment sales | 1,402 | 1,707 | 2,824 | 3,248
Total sales | 7,289 | 8,233 | 14,665 | 15,703
Equity income | (10) | 21 | (12) | 26
Depreciation, depletion, and amortization | 343 | 355 | 689 | 695
Income taxes | 95 | 222 | 202 | 414
After-tax operating income (ATOI) | 275 | 635 | 571 | 1,190
Segment Information | Alumina |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | 750 | 926 | 1,525 | 1,736
Intersegment sales | 576 | 723 | 1,193 | 1,356
Total sales | 1,326 | 1,649 | 2,718 | 3,092
Equity income | 1 | 22 | 2 | 25
Depreciation, depletion, and amortization | 114 | 112 | 228 | 215
Income taxes | (6) | 60 | (7) | 104
After-tax operating income (ATOI) | 23 | 186 | 58 | 328
Segment Information | Primary Metals |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | 1,804 | 2,145 | 3,748 | 4,125
Intersegment sales | 782 | 922 | 1,543 | 1,761
Total sales | 2,586 | 3,067 | 5,291 | 5,886
Equity income | (9) | (1) | (11) |
Depreciation, depletion, and amortization | 133 | 142 | 268 | 283
Income taxes | (19) | 55 | (32) | 108
After-tax operating income (ATOI) | (3) | 201 | 7 | 403
Segment Information | Global Rolled Products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | 1,913 | 2,085 | 3,758 | 3,977
Intersegment sales | 44 | 62 | 88 | 131
Total sales | 1,957 | 2,147 | 3,846 | 4,108
Equity income | (2) |  | (3) |
Depreciation, depletion, and amortization | 57 | 60 | 114 | 118
Income taxes | 43 | 35 | 92 | 68
After-tax operating income (ATOI) | 95 | 99 | 191 | 180
Segment Information | Engineered Products And Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | 1,420 | 1,370 | 2,810 | 2,617
Total sales | 1,420 | 1,370 | 2,810 | 2,617
Equity income |  |  |  | 1
Depreciation, depletion, and amortization | 39 | 41 | 79 | 79
Income taxes | 77 | 72 | 149 | 134
After-tax operating income (ATOI) | $ 160 | $ 149 | $ 315 | $ 279

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