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Commitments And Contingencies (Investments) (Details) In Millions, unless otherwise specified | 9 Months Ended |  |  |  |  | 12 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended |  | 12 Months Ended |  |
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Sep. 30, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2004 | Sep. 30, 2011 Non Current Liabilities and Deferred Credits [Member] USD ($) | Dec. 31, 2010 Non Current Liabilities and Deferred Credits [Member] USD ($) | Dec. 31, 2010 Smelting and Rolling Mill Companies [Member] USD ($) | Sep. 30, 2011 Ma'aden Joint Venture [Member] | Sep. 30, 2011 Alcoa Joint Venture [Member] USD ($) | Sep. 30, 2011 Alcoa Joint Venture [Member] USD ($) | Sep. 30, 2011 Alcoa Joint Venture [Member] SAR | Dec. 31, 2010 Alcoa Joint Venture [Member] USD ($) | Sep. 30, 2011 Brazilian Real [Member] | Sep. 30, 2011 Barra Grande [Member] | Sep. 30, 2011 Machadinho [Member] | Sep. 30, 2011 Machadinho and Barra Grande [Member] BRL MWH | Sep. 30, 2011 Machadinho and Barra Grande [Member] USD ($) | Dec. 31, 2010 Machadinho and Barra Grande [Member] BRL | Dec. 31, 2010 Machadinho and Barra Grande [Member] USD ($) | Mar. 31, 2010 Estreito Project [Member] USD ($) | Mar. 31, 2010 Estreito Project [Member] BRL | Sep. 30, 2011 Estreito Project [Member] BRL MWH | Sep. 30, 2011 Estreito Project [Member] USD ($) | Dec. 31, 2006 Estreito Project [Member] Alcoa Aluminio [Member] | Jun. 30, 2011 Serra do Facao Project [Member] USD ($) | Jun. 30, 2011 Serra do Facao Project [Member] BRL MWH | Dec. 31, 2010 Serra do Facao Project [Member] USD ($) | Dec. 31, 2010 Serra do Facao Project [Member] BRL | Dec. 31, 2006 Serra do Facao Project [Member] Alcoa Aluminio [Member] | Sep. 30, 2011 Dampier to Bunbry Natural Gas Pipeline (DBNGP) [Member] USD ($) | Sep. 30, 2011 Dampier to Bunbry Natural Gas Pipeline (DBNGP) [Member] AUD | Dec. 31, 2004 Dampier to Bunbry Natural Gas Pipeline (DBNGP) [Member] USD ($) | Dec. 31, 2004 Dampier to Bunbry Natural Gas Pipeline (DBNGP) [Member] AUD | Dec. 31, 2011 Dampier to Bunbry Natural Gas Pipeline (DBNGP) [Member] AUD | Dec. 31, 2011 Dampier to Bunbry Natural Gas Pipeline (DBNGP) [Member] USD ($) | Dec. 31, 2006 Alcoa Aluminio [Member] | Sep. 30, 2011 Alcoa Aluminio [Member] USD ($) MWH | Sep. 30, 2011 Alcoa Aluminio [Member] BRL | Dec. 31, 2010 Alcoa [Member] USD ($)
Ownership interest in joint venture at fair market value |  |  |  |  |  |  | 74.90% |  | 25.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment | $ 1,521 | $ 1,340 |  |  |  | $ 4,000 |  | $ 10,800 | $ 10,800 | 40,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount invested by Alcoa and Aluminum Financing Limited |  |  |  |  |  |  |  | 1,100 | 1,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount invested by Alcoa and Aluminum Financing Limited, over year | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment commitment paid-to-date |  |  |  |  |  |  |  | 325 | 325 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 180 | 340 |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment commitment paid in period |  |  |  |  |  |  |  | 13 | 165 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duration of sharing capital commitment, in years |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power self sufficiency |  |  |  |  |  |  |  |  |  |  |  | 70.00% |  |  | 40.00% | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in SPPL as an equity method investment |  |  |  |  |  |  |  | 461 | 461 |  | 285 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantee issued on behalf of smelting and rolling mill companies |  |  |  | 8 | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,004
Ownership interest issued as a guarantee for smelting and rolling companies |  |  |  |  |  |  | 74.90% |  |  | 25.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service requirements, principal |  |  |  |  |  | 108 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service requirements, interest |  |  |  |  |  | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment percentage |  |  |  |  |  |  |  |  |  |  |  |  | 42.18% | 30.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total energy demand |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 690 | 690 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total investment in project |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 487 | 266 | 461 | 274 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aluminio's share of Serra do Facao |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 190 | 350 |  |  |  |  |  |  |  |  |  |  |  |  |
Additional acquired share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.41% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in estimated cost to complete Estreito project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 720 | 1,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aluminio's share of Estreito project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,250 | 680 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated project costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,900 | 2,700 |  | 550 | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Total investment in Serra do Facao |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 106 | 193 | 116 | 195 |  |  |  |  |  |  |  |  |  |  |
Percent interest in a consortium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34.97% |  |  |  |  |  |  | 25.49% |  |  |
Assured energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65 | 65 |  |  |  |  |  |  |  |  |  |  | 38 | 38 |
Energy capacity installed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 280 | 280 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assured power from installed capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150 | 150 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial cash investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17 | 24 |  |  |  |  |  |
Additional contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16 | 16 | 141 | 176 |  |  |  |  |  |
Additional amount committed to invest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 | 10 |  |  |  |
Amount contributed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 620 | 1,100 |
Alcoa's maximum exposure to loss in projects |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 570 | $ 310 |  |  |  |  |  |  |  |  |  |  |  |  | $ 470 | 480 |  |  |  |  |  | $ 220 | 400 |
Interest in consortium |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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