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Contingencies and Commitments - Additional Information - 2 (Detail) In Millions, unless otherwise specified | 3 Months Ended |  |  |  |  | 3 Months Ended |  |  | 3 Months Ended |  | 3 Months Ended | 12 Months Ended | 3 Months Ended |  |  | 3 Months Ended |  |  |  | 12 Months Ended |  |  | 12 Months Ended | 3 Months Ended |  | 12 Months Ended | 1 Months Ended | 3 Months Ended
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Mar. 31, 2013 USD ($) MW | Dec. 31, 2012 USD ($) | Dec. 31, 2012 EUR (€) | Dec. 31, 2010 USD ($) | Mar. 31, 2013 Other noncurrent liabilities and deferred credits [Member] USD ($) | Dec. 31, 2012 Other noncurrent liabilities and deferred credits [Member] USD ($) | Mar. 31, 2013 Alcoa World Alumina Brasil [Member] USD ($) | Mar. 31, 2013 Alcoa World Alumina Brasil [Member] BRL | Mar. 31, 2013 Alcoa World Alumina Brasil [Member] Minimum [Member] USD ($) | Mar. 31, 2013 Alcoa World Alumina Brasil [Member] Minimum [Member] Fixed Assets [Member] USD ($) | Mar. 31, 2013 Alcoa World Alumina Brasil [Member] Maximum [Member] USD ($) | Mar. 31, 2013 Alcoa World Alumina Brasil [Member] Maximum [Member] Fixed Assets [Member] USD ($) | Mar. 31, 2013 Alcoa World Alumina Brasil [Member] Maximum [Member] Fixed Assets [Member] BRL | Dec. 31, 2012 Alcoa [Member] USD ($) | Mar. 31, 2013 Barra Grande [Member] USD ($) MWh | Mar. 31, 2013 Barra Grande [Member] BRL MWh | Dec. 31, 2012 Barra Grande [Member] USD ($) | Dec. 31, 2012 Barra Grande [Member] BRL | Mar. 31, 2013 Estreito project [Member] USD ($) MWh | Mar. 31, 2013 Estreito project [Member] BRL | Mar. 31, 2012 East St. Louis, IL site [Member] USD ($) | Dec. 31, 2005 East St. Louis, IL site [Member] USD ($) | Dec. 31, 2009 Fusina [Member] USD ($) | Dec. 31, 2009 Portovesme [Member] USD ($) | Sep. 30, 2012 Baie Comeau [Member] USD ($) | Sep. 30, 2012 Mosjoen [Member] USD ($) | Mar. 31, 2013 Ma'aden joint venture [Member] | Dec. 31, 2011 Ma'aden joint venture [Member] | Mar. 31, 2013 Alcoa [Member] USD ($) Y | Mar. 31, 2013 Alcoa [Member] SAR | Dec. 31, 2012 Alcoa [Member] USD ($) | Dec. 31, 2011 Alcoa [Member] | Dec. 31, 2010 Smelting and rolling mill companies [Member] USD ($) | Mar. 31, 2013 Smelting and rolling mill companies [Member] Other noncurrent liabilities and deferred credits [Member] USD ($) | Dec. 31, 2012 Smelting and rolling mill companies [Member] Other noncurrent liabilities and deferred credits [Member] USD ($) | Dec. 31, 2011 Refining and mining company [Member] USD ($) | Mar. 31, 2013 Alumina Limited [Member] | Mar. 31, 2013 Machadinho and Barra Grande [Member] Y | Mar. 31, 2013 Serrado Facao and Estreito Projects [Member] Y | Mar. 31, 2013 Machadinho [Member] MWh | Mar. 31, 2013 Serra Do Facao Project [Member] USD ($) MWh | Mar. 31, 2013 Serra Do Facao Project [Member] BRL | Dec. 31, 2012 Serra Do Facao Project [Member] USD ($) | Dec. 31, 2012 Serra Do Facao Project [Member] BRL | Dec. 31, 2004 Dampier to Bunbury Natural Gas Pipeline [Member] USD ($) | Dec. 31, 2004 Dampier to Bunbury Natural Gas Pipeline [Member] AUD | Mar. 31, 2013 Dampier to Bunbury Natural Gas Pipeline [Member] Three-Year Equity Call Plan [Member] USD ($) | Mar. 31, 2013 Dampier to Bunbury Natural Gas Pipeline [Member] Three-Year Equity Call Plan [Member] AUD | Mar. 31, 2013 Dampier to Bunbury Natural Gas Pipeline [Member] Three-Year Equity Call Plan [Member] USD ($) | Mar. 31, 2013 Dampier to Bunbury Natural Gas Pipeline [Member] Three-Year Equity Call Plan [Member] AUD
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remediation reserve increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14 | $ 15 | $ 12 | $ 3 | $ 25 | $ 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disallowed tax credits |  |  |  |  |  |  | 110 | 220 |  | 0 |  | 90 | 175 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of penalty of the gross disallowed amount |  |  |  |  |  |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value added tax receivable |  |  |  |  |  |  | 41 | 82 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated range of reasonably possible loss, minimum |  |  |  |  |  |  |  | 155 | 0 |  | 75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Administrative appeal, assessment period |  |  |  |  |  |  | 2 years | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest issued as guarantee for smelting and rolling mill companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74.90% | 74.90% | 25.10% |  | 25.10% | 25.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment | 1,862 | 1,860 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,800 | 40,500 |  |  | 4,035 |  |  | 1,992 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount invested by Alcoa and Aluminum Financing Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of investment by Alcoa and Aluminum Financing Limited, years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment commitment paid-to-date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 740 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment commitment paid in period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 79 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 890 |  | 816 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantee issued on behalf of smelting and rolling mill companies |  |  |  |  | 4 | 4 |  |  |  |  |  |  |  | 1,013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 | 10 | 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project financing |  |  |  | 480 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of project financing representing Alcoa interest in venture |  |  |  | 120 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service requirements, principal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 121 |  |  | 60 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service requirements, interest maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60 |  |  | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture at fair market value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to taking share of output in associated projects at cost, in years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 | 26 |  |  |  |  |  |  |  |  |  |  |
Investment percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42.18% | 42.18% |  |  | 25.49% | 25.49% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.99% | 34.97% | 34.97% |  |  | 20.00% | 20.00% |  |  |  |
Assured power from installed capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 160 | 160 |  |  | 150 | 150 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120 | 65 | 65 |  |  |  |  |  |  |  |
Total investment in project |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 160 | 324 | 159 | 326 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98 | 198 | 98 | 200 |  |  |  |  |  |
Estimated project costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,560 | 5,170 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500 | 1,000 |  |  |  |  |  |  |  |
Aluminio's share of project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 650 | 1,320 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 170 | 350 |  |  |  |  |  |  |  |
Additional contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 175 | 350 |  |  | 141 | 176 | 21 | 21 | 4 | 4
Increase in estimated costs to complete project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130 | 270 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment expended on the project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 620 | 1,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of power self-sufficiency upon completion of project with full operating capacity | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total energy demand | 690 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial cash investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17 | 24 |  |  |  |
Required plan contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 | 40
Repayments made under the agreement for future gas transmission services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 364 | 350
Alcoa's maximum exposure to loss in projects |  | $ 387 | € 303 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 520 | 500 | $ 520 | 500

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