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Contingencies And Commitments (Investments) (Narrative) (Details) In Millions, unless otherwise specified | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended | 12 Months Ended | 3 Months Ended |  |  | 12 Months Ended | 3 Months Ended |  | 3 Months Ended |  |  | 3 Months Ended | 12 Months Ended | 3 Months Ended | 15 Months Ended |  |
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Mar. 31, 2012 USD ($) MWh MW | Dec. 31, 2011 USD ($) | Mar. 31, 2012 Aluminio [Member] USD ($) | Mar. 31, 2012 Aluminio [Member] BRL | Dec. 31, 2011 Alcoa Inc. [Member] USD ($) | Mar. 31, 2012 Barra Grande [Member] | Mar. 31, 2012 Machadinho [Member] | Mar. 31, 2012 Machadinho And Barra Grande [Member] USD ($) Y | Mar. 31, 2012 Machadinho And Barra Grande [Member] BRL Y | Dec. 31, 2011 Machadinho And Barra Grande [Member] USD ($) | Dec. 31, 2011 Machadinho And Barra Grande [Member] BRL | Mar. 31, 2012 Estreito Project [Member] MWh | Dec. 31, 2011 Estreito Project [Member] USD ($) | Dec. 31, 2011 Estreito Project [Member] ZAR | Dec. 31, 2010 Estreito Project [Member] USD ($) | Dec. 31, 2010 Estreito Project [Member] ZAR | Dec. 31, 2006 Estreito Project [Member] Aluminio [Member] | Dec. 31, 2006 Estreito Hydroelectric Power Project [Member] MWh | Mar. 31, 2012 Serra Do Facao Project [Member] USD ($) | Mar. 31, 2012 Serra Do Facao Project [Member] ZAR | Mar. 31, 2012 Serra Do Facao Project [Member] BRL | Dec. 31, 2011 Serra Do Facao Project [Member] USD ($) | Dec. 31, 2011 Serra Do Facao Project [Member] BRL | Dec. 31, 2007 Serra Do Facao Project [Member] Aluminio [Member] | Dec. 31, 2004 Dampier To Bunbury Natural Gas Pipeline (DBNGP) [Member] USD ($) | Dec. 31, 2004 Dampier To Bunbury Natural Gas Pipeline (DBNGP) [Member] AUD | Mar. 31, 2012 Ma'aden Joint Venture [Member] | Dec. 31, 2011 Ma'aden Joint Venture [Member] | Mar. 31, 2012 Alcoa Joint Venture [Member] USD ($) Y | Mar. 31, 2012 Alcoa Joint Venture [Member] SAR | Dec. 31, 2011 Alcoa Joint Venture [Member] USD ($) | Mar. 31, 2012 Alumina Limited [Member] | Dec. 31, 2010 Smelting And Rolling Mill Companies [Member] USD ($) | Dec. 31, 2011 Refining And Mining Company [Member] USD ($) | Mar. 31, 2012 Three-Year Equity Call Plan [Member] Dampier To Bunbury Natural Gas Pipeline (DBNGP) [Member] USD ($) | Mar. 31, 2012 Three-Year Equity Call Plan [Member] Dampier To Bunbury Natural Gas Pipeline (DBNGP) [Member] AUD | Mar. 31, 2012 Three-Year Equity Call Plan [Member] Dampier To Bunbury Natural Gas Pipeline (DBNGP) [Member] USD ($) | Mar. 31, 2012 Three-Year Equity Call Plan [Member] Dampier To Bunbury Natural Gas Pipeline (DBNGP) [Member] AUD | Mar. 31, 2012 Other Noncurrent Liabilities And Deferred Credits [Member] Smelting And Rolling Mill Companies [Member] USD ($) | Dec. 31, 2011 Other Noncurrent Liabilities And Deferred Credits [Member] Smelting And Rolling Mill Companies [Member] USD ($) | Dec. 31, 2011 Other Noncurrent Liabilities And Deferred Credits [Member] Refining And Mining Company [Member] USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture at fair market value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74.90% |  | 25.10% |  |  | 40.00% |  |  |  |  |  |  |  |  |
Capital investment | $ 1,750 | $ 1,626 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Capital investment commitment paid-to-date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 501 |  |  |  |  |  |  |  |  |  |  |  |
Capital investment commitment paid in period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 93 |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 664 |  | 565 |  |  |  |  |  |  |  |  |  |
Guarantee issued on behalf of smelting and rolling mill companies |  |  |  |  | 1,013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500 |  |  |  |  | 9 | 8 | 5
Ownership interest issued as guarantee for smelting and rolling mill companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74.90% |  |  | 25.10% |  |  |  |  |  |  |  |  |  |
Debt service requirements, principal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 108 | 60 |  |  |  |  |  |  |
Debt service requirements, interest maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50 | 25 |  |  |  |  |  |  |
Investment percentage |  |  |  |  |  | 42.18% | 30.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to taking share of output in associated projects at cost, in years |  |  |  |  |  |  |  | 30 | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total investment in project |  |  |  |  |  |  |  | 275 | 504 | 266 | 496 |  |  |  |  |  |  |  | 106 |  | 195 | 105 | 196 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional acquired share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.41% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in estimated cost to complete project |  |  |  |  |  |  |  |  |  |  |  |  | 720 | 1,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aluminio's share of project |  |  |  |  |  |  |  |  |  |  |  |  | 680 | 1,250 |  |  |  |  | 190 | 350 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated project costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,700 | 4,900 |  |  | 550 | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment expended on the project |  |  | 650 | 1,190 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total participation in the consortium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.49% |  |  |  |  |  |  | 34.97% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial cash investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17 | 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 190 | 340 |  |  |  |  | 141 | 176 |  |  |  |  |  |  |  |  | 4 | 3 | 9 | 9 |  |  |
Required plan contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 | 40 |  |  |  |  |
Assured energy, megawatts | 65 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy capacity installed, megawatts |  |  |  |  |  |  |  |  |  |  |  | 280 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assured power from installed capacity |  |  |  |  |  |  |  |  |  |  |  | 150 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments made under the agreement for future gas transmission services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 358 | 344 |  |  |  |  |
Alcoa's maximum exposure to loss in projects |  |  | $ 220 | 400 |  |  |  | $ 310 | 570 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 530 | 510 | $ 530 | 510 |  |  |
Percentage of current power self-sufficiency | 67.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of power self-sufficiency upon completion of project with full operating capacity | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total energy demand | 690 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantee expiration year | 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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