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Investments - Additional Information (Detail) In Millions, unless otherwise specified | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  |  | 1 Months Ended |  |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2012 USD ($) Subsidiary Kmt | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Oct. 31, 2011 Ma'aden Joint Venture [Member] | Dec. 31, 2012 Ma'aden Joint Venture [Member] | Dec. 31, 2011 Ma'aden Joint Venture [Member] USD ($) | Dec. 31, 2010 Ma'aden Joint Venture [Member] USD ($) | Dec. 31, 2012 Alcoa [Member] USD ($) Y | Dec. 31, 2012 Alcoa [Member] SAR Y | Dec. 31, 2011 Alcoa [Member] USD ($) | Dec. 31, 2012 Alcoa [Member] Alcoa World Alumina and Chemicals [Member] | Dec. 31, 2012 Smelting and Rolling Mill Companies [Member] USD ($) | Dec. 31, 2010 Smelting and Rolling Mill Companies [Member] USD ($) | Dec. 31, 2012 Other Noncurrent Liabilities and Deferred Credits [Member] USD ($) | Dec. 31, 2011 Other Noncurrent Liabilities and Deferred Credits [Member] USD ($) | Oct. 31, 2011 Refining and Mining Company [Member] USD ($) | Dec. 31, 2012 Refining and Mining Company [Member] USD ($) | Dec. 31, 2011 Refining and Mining Company [Member] USD ($) | Dec. 31, 2012 Fixed Income Securities [Member] USD ($) | Dec. 31, 2011 Equity Securities [Member] USD ($) | Dec. 31, 2012 Alumina Limited [Member] Alcoa World Alumina and Chemicals [Member] | Dec. 31, 2011 Saudi Arabia Joint Venture [Member] Scenario One [Member] USD ($) | Dec. 31, 2011 Saudi Arabia Joint Venture [Member] Scenario Two [Member] USD ($) | Dec. 31, 2012 Becancour Smelter [Member] | Dec. 31, 2012 Boke Investment Company [Member] | Dec. 31, 2012 Compagnie Des Bauxites De Guinee [Member] | Dec. 31, 2012 Bauxite mining [Member] Kmt | Dec. 31, 2012 Bauxite mining [Member] Halco Mining, Inc. [Member] | Dec. 31, 2012 Bauxite mining [Member] Minerao Rio Do Norte S.A. [Member] | Dec. 31, 2012 Alumina Refinery [Member] Kmt | Dec. 31, 2012 Primary aluminum smelter [Member] Kmt | Dec. 31, 2012 Rolling mill [Member] Kmt | Dec. 31, 2012 Smelter Operation [Member] Pechiney Reynolds Quebec, Inc. [Member] | Dec. 31, 2012 Smelter Operation [Member] Becancour smelter in Quebec, Canada [Member] | Dec. 31, 2012 Smelter Operation [Member] Alcoa [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of equity investments in other entity | 50.00% |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |  |  |  | 40.00% |  |  | 49.90% | 100.00% | 51.00% |  | 45.00% | 18.20% |  |  |  | 50.00% | 50.10% | 25.05%
Number of wholly-owned subsidiaries | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends from equity investments | $ 101 | $ 100 | $ 33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture shareholders agreement period, years |  |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture shareholders agreement, automatic extension additional period, years |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Projected capacity amount of processed bauxite, in kmt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000 |  |  | 1,800 | 740 | 380 |  |  |
Expanded capacity amount of processed bauxite, in Kmt | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture |  |  |  | 74.90% | 74.90% |  | 74.90% | 25.10% | 25.10% |  |  |  | 25.10% |  |  | 25.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial investment |  |  |  |  |  |  |  | 80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for pro rata share of pre-incorporation costs |  |  |  |  |  | 22 | 34 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture at fair market value |  |  |  |  | 14.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding receivable for labor and other employee-related expenses | 28 | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment | 1,860 | 1,626 |  |  |  |  |  | 10,800 | 40,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount invested by Alcoa and Aluminum Financing Limited |  |  |  |  |  |  |  | 1,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of investment by Alcoa and Aluminum Financing Limited, years |  |  |  |  |  |  |  | 5 | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment commitment paid-to-date | 253 | 249 |  |  |  |  |  | 661 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments | 1,782 | 1,524 |  |  |  |  |  | 816 |  | 565 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project financing |  |  |  |  |  |  |  |  |  |  |  | 480 | 4,035 |  |  | 1,992 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of project financing representing Alcoa interest in venture |  |  |  |  |  |  |  |  |  |  |  | 120 | 1,013 |  |  | 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service requirements, principal |  |  |  |  |  |  |  |  |  |  |  | 121 |  |  |  | 60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service requirements, interest maximum |  |  |  |  |  |  |  |  |  |  |  | 60 |  |  |  | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of guarantee included in other noncurrent liabilities and deferred credits | 494 |  |  |  |  |  |  |  |  |  |  |  |  | 10 | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Combined fair value of guarantees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential forfeiture of letter of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350 | 60 |  |  |  |  |  |  |  |  |  |  |  |
Other investments | $ 78 | $ 102 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 67 | $ 92 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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