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Segment and Geographic Area Information - Schedule of Operating Results and Assets of Alcoa's Reportable Segment (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |
Total sales | $ 27,795 | $ 28,777 | $ 30,826
Equity income (loss) | (68) | (28) | 16
Depreciation, depletion, and amortization | 1,337 | 1,374 | 1,395
Income taxes | 448 | 535 | 627
ATOI | 1,217 | 1,357 | 1,885
Capital expenditures | 1,105 | 1,150 |
Equity investments | 1,775 | 1,763 |
Goodwill | 2,897 | 3,898 |
Total assets | 29,247 | 31,912 |
Intersegment Sales [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Intersegment sales | 5,034 | 5,350 | 6,137
Third-Party Sales [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Third-party sales | 22,761 | 23,427 | 24,689
Alumina [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total sales | 5,561 | 5,402 | 6,189
Equity income (loss) | (4) | 5 | 25
Depreciation, depletion, and amortization | 426 | 455 | 444
Income taxes | 66 | (27) | 179
ATOI | 259 | 90 | 607
Capital expenditures | 322 | 374 |
Equity investments | 628 | 658 |
Goodwill | 9 | 10 |
Total assets | 8,248 | 9,709 |
Alumina [Member] | Intersegment Sales [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Intersegment sales | 2,235 | 2,310 | 2,727
Alumina [Member] | Third-Party Sales [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Third-party sales | 3,326 | 3,092 | 3,462
Primary Metals [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total sales | 9,217 | 10,309 | 11,432
Equity income (loss) | (51) | (27) | (7)
Depreciation, depletion, and amortization | 526 | 532 | 556
Income taxes | (74) | 106 | 92
ATOI | (20) | 309 | 481
Capital expenditures | 224 | 318 |
Equity investments | 947 | 917 |
Goodwill |  | 997 |
Total assets | 10,341 | 11,709 |
Primary Metals [Member] | Intersegment Sales [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Intersegment sales | 2,621 | 2,877 | 3,192
Primary Metals [Member] | Third-Party Sales [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Third-party sales | 6,596 | 7,432 | 8,240
Global Rolled Products [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total sales | 7,284 | 7,541 | 7,860
Equity income (loss) | (13) | (6) | (3)
Depreciation, depletion, and amortization | 226 | 229 | 237
Income taxes | 108 | 159 | 98
ATOI | 252 | 346 | 260
Capital expenditures | 335 | 258 |
Equity investments | 200 | 188 |
Goodwill | 218 | 214 |
Total assets | 4,647 | 4,603 |
Global Rolled Products [Member] | Intersegment Sales [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Intersegment sales | 178 | 163 | 218
Global Rolled Products [Member] | Third-Party Sales [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Third-party sales | 7,106 | 7,378 | 7,642
Engineered Products and Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total sales | 5,733 | 5,525 | 5,345
Equity income (loss) |  |  | 1
Depreciation, depletion, and amortization | 159 | 158 | 158
Income taxes | 348 | 297 | 258
ATOI | 726 | 612 | 537
Capital expenditures | 224 | 200 |
Goodwill | 2,670 | 2,677 |
Total assets | 6,011 | 5,891 |
Engineered Products and Solutions [Member] | Third-Party Sales [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Third-party sales | $ 5,733 | $ 5,525 | $ 5,345

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