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Segment and Geographic Area Information - Schedule of Operating Results and Assets of Alcoa's Reportable Segments (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |
Third-party sales | $ 23,427 | $ 24,689 | $ 20,746
Intersegment sales | 5,350 | 6,137 | 4,989
Total sales | 28,777 | 30,826 | 25,735
Equity income (loss) | (28) | 16 | 13
Depreciation, depletion, and amortization | 1,374 | 1,395 | 1,369
Income taxes | 543 | 635 | 443
ATOI | 1,369 | 1,893 | 1,424
Capital expenditures | 1,261 | 1,287 | 1,015
Equity investments | 1,782 | 1,524 |
Goodwill | 5,170 | 5,157 | 5,028
Total assets | 40,179 | 40,120 |
Alumina [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 10 | 11 | 12
Primary Metals [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 997 | 991 | 993
Engineered Products and Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 2,677 | 2,666 | 2,523
Segment Information [Member] | Alumina [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Third-party sales | 3,092 | 3,462 | 2,815
Intersegment sales | 2,310 | 2,727 | 2,212
Total sales | 5,402 | 6,189 | 5,027
Equity income (loss) | 5 | 25 | 10
Depreciation, depletion, and amortization | 455 | 444 | 406
Income taxes | (27) | 179 | 60
ATOI | 90 | 607 | 301
Capital expenditures | 374 | 371 |
Equity investments | 658 | 450 |
Goodwill | 10 | 11 |
Total assets | 9,709 | 9,782 |
Segment Information [Member] | Primary Metals [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Third-party sales | 7,432 | 8,240 | 7,070
Intersegment sales | 2,877 | 3,192 | 2,597
Total sales | 10,309 | 11,432 | 9,667
Equity income (loss) | (27) | (7) | 1
Depreciation, depletion, and amortization | 532 | 556 | 571
Income taxes | 106 | 92 | 96
ATOI | 309 | 481 | 488
Capital expenditures | 318 | 463 |
Equity investments | 917 | 925 |
Goodwill | 997 | 991 |
Total assets | 11,709 | 11,867 |
Segment Information [Member] | Global Rolled Products [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Third-party sales | 7,378 | 7,642 | 6,277
Intersegment sales | 163 | 218 | 180
Total sales | 7,541 | 7,860 | 6,457
Equity income (loss) | (6) | (3) |
Depreciation, depletion, and amortization | 229 | 237 | 238
Income taxes | 167 | 104 | 92
ATOI | 358 | 266 | 220
Capital expenditures | 258 | 157 |
Equity investments | 188 | 123 |
Goodwill | 214 | 208 |
Total assets | 4,603 | 4,559 |
Segment Information [Member] | Engineered Products and Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Third-party sales | 5,525 | 5,345 | 4,584
Total sales | 5,525 | 5,345 | 4,584
Equity income (loss) |  | 1 | 2
Depreciation, depletion, and amortization | 158 | 158 | 154
Income taxes | 297 | 260 | 195
ATOI | 612 | 539 | 415
Capital expenditures | 200 | 173 |
Goodwill | 2,677 | 2,666 |
Total assets | $ 5,891 | $ 5,831 |

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