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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Total sales | $ 7,088 | $ 7,289 | $ 14,247 | $ 14,665
Equity income (loss) | (10) | (10) | (22) | (12)
Depreciation, depletion, and amortization | 341 | 343 | 682 | 689
Income taxes | 115 | 85 | 253 | 195
ATOI | 304 | 255 | 655 | 559
Third-Party Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | 5,787 | 5,887 | 11,573 | 11,841
Intersegment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment sales | 1,301 | 1,402 | 2,674 | 2,824
Alumina [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,403 | 1,326 | 2,824 | 2,718
Equity income (loss) | (1) | 1 |  | 2
Depreciation, depletion, and amortization | 115 | 114 | 224 | 228
Income taxes | 14 | (6) | 28 | (7)
ATOI | 64 | 23 | 122 | 58
Alumina [Member] | Third-Party Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | 822 | 750 | 1,648 | 1,525
Alumina [Member] | Intersegment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment sales | 581 | 576 | 1,176 | 1,193
Primary Metals [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 2,297 | 2,586 | 4,782 | 5,291
Equity income (loss) | (7) | (9) | (16) | (11)
Depreciation, depletion, and amortization | 132 | 133 | 267 | 268
Income taxes | (25) | (19) | (24) | (32)
ATOI | (32) | (3) | 7 | 7
Primary Metals [Member] | Third-Party Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | 1,620 | 1,804 | 3,378 | 3,748
Primary Metals [Member] | Intersegment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment sales | 677 | 782 | 1,404 | 1,543
Global Rolled Products [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,920 | 1,957 | 3,750 | 3,846
Equity income (loss) | (2) | (2) | (6) | (3)
Depreciation, depletion, and amortization | 55 | 57 | 112 | 114
Income taxes | 32 | 34 | 71 | 85
ATOI | 79 | 78 | 160 | 180
Global Rolled Products [Member] | Third-Party Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | 1,877 | 1,913 | 3,656 | 3,758
Global Rolled Products [Member] | Intersegment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment sales | 43 | 44 | 94 | 88
Engineered Products and Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,468 | 1,420 | 2,891 | 2,810
Depreciation, depletion, and amortization | 39 | 39 | 79 | 79
Income taxes | 94 | 76 | 178 | 149
ATOI | 193 | 157 | 366 | 314
Engineered Products and Solutions [Member] | Third-Party Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Third-party sales | $ 1,468 | $ 1,420 | $ 2,891 | $ 2,810

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