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Segment Information - Schedule of Operating Results of Alcoa's Reportable Segments (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Segment Reporting Information [Line Items] |  |
Third-party sales | $ 5,786 | $ 5,954
Intersegment sales | 1,373 | 1,422
Total sales | 7,159 | 7,376
Equity income (loss) | (12) | (2)
Depreciation, depletion, and amortization | 341 | 346
Income taxes | 138 | 110
ATOI | 351 | 304
Segment Information [Member] | Alumina [Member] |  |
Segment Reporting Information [Line Items] |  |
Third-party sales | 826 | 775
Intersegment sales | 595 | 617
Total sales | 1,421 | 1,392
Equity income (loss) | 1 | 1
Depreciation, depletion, and amortization | 109 | 114
Income taxes | 14 | (1)
ATOI | 58 | 35
Segment Information [Member] | Primary Metals [Member] |  |
Segment Reporting Information [Line Items] |  |
Third-party sales | 1,758 | 1,944
Intersegment sales | 727 | 761
Total sales | 2,485 | 2,705
Equity income (loss) | (9) | (2)
Depreciation, depletion, and amortization | 135 | 135
Income taxes | 1 | (13)
ATOI | 39 | 10
Segment Information [Member] | Global Rolled Products [Member] |  |
Segment Reporting Information [Line Items] |  |
Third-party sales | 1,779 | 1,845
Intersegment sales | 51 | 44
Total sales | 1,830 | 1,889
Equity income (loss) | (4) | (1)
Depreciation, depletion, and amortization | 57 | 57
Income taxes | 39 | 51
ATOI | 81 | 102
Segment Information [Member] | Engineered Products and Solutions [Member] |  |
Segment Reporting Information [Line Items] |  |
Third-party sales | 1,423 | 1,390
Intersegment sales |  |
Total sales | 1,423 | 1,390
Equity income (loss) |  |
Depreciation, depletion, and amortization | 40 | 40
Income taxes | 84 | 73
ATOI | $ 173 | $ 157

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- Details
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