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Investments (Narrative) (Details) In Millions, unless otherwise specified | 12 Months Ended |  | 1 Months Ended |  | 12 Months Ended | 1 Months Ended |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  |  | 1 Months Ended |  | 1 Months Ended | 12 Months Ended
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Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2009 USD ($) | Jun. 30, 2009 USD ($) | Mar. 31, 2010 Aluminum Financing Limited Noncontrolling Interests [Member] USD ($) | Dec. 31, 2011 Other Noncurrent Liabilities And Deferred Credits [Member] USD ($) | Dec. 31, 2011 Smelting And Rolling Mill Companies [Member] USD ($) | Dec. 31, 2010 Smelting And Rolling Mill Companies [Member] USD ($) | Oct. 31, 2011 Refining And Mining Company [Member] USD ($) | Dec. 31, 2011 Refining And Mining Company [Member] USD ($) | Oct. 31, 2011 Ma'aden Joint Venture [Member] | Mar. 31, 2010 Ma'aden Joint Venture [Member] | Dec. 31, 2009 Ma'aden Joint Venture [Member] years | Dec. 31, 2011 Ma'aden Joint Venture [Member] USD ($) | Dec. 31, 2010 Ma'aden Joint Venture [Member] USD ($) | Dec. 31, 2009 Saudi Arabia Joint Venture [Member] | Mar. 31, 2010 Alcoa Joint Venture [Member] | Dec. 31, 2011 Alcoa Joint Venture [Member] USD ($) | Dec. 31, 2011 Alcoa Joint Venture [Member] SAR | Dec. 31, 2009 Alcoa Joint Venture [Member] USD ($) | Dec. 31, 2010 Alcoa Joint Venture [Member] USD ($) | Dec. 31, 2009 Aluminum Financing Limited Joint Venture [Member] | Dec. 31, 2009 Aluminum Financing Limited [Member] | Dec. 31, 2011 Fixed Income Securities [Member] USD ($) | Dec. 31, 2010 Equity Securities [Member] USD ($) | Dec. 31, 2011 Alumina Limited [Member] | Dec. 31, 2009 Alumina Refinery [Member] | Dec. 31, 2011 Smelter Operation [Member] Pechiney Reynolds Quebec, Inc. [Member] | Dec. 31, 2011 Bauxite Mining [Member] Halco Mining, Inc. [Member] | Dec. 31, 2011 Bauxite Mining [Member] Minerao Rio Do Norte S.A. [Member] | Dec. 31, 2009 Mine [Member] | Dec. 31, 2009 Primary Aluminum Smelter [Member] | Dec. 31, 2009 Rolling Mill [Member] | Dec. 31, 2011 Scenario One [Member] Saudi Arabia Joint Venture [Member] USD ($) | Dec. 31, 2011 Scenario Two [Member] Saudi Arabia Joint Venture [Member] USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture shareholders agreement period, years |  |  |  |  |  |  |  |  |  |  |  |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture shareholders agreement, automatic extension additional period, years |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Projected capacity amount of processed bauxite, in kmt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,800 |  |  |  | 4,000 | 740 | 380 |  |
Dividends from equity investments | $ 100 | $ 33 | $ 56 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of notes receivable |  |  |  |  | 40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture at fair market value |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of equity investments in other entity, maximum | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% | 60.00% |  |  |  |  |  |  | 40.00% |  | 25.05% | 45.00% | 18.20% |  |  |  |  |
Ownership interest in joint venture |  |  |  |  |  |  |  | 25.10% | 25.10% |  | 74.90% | 74.90% |  |  | 74.90% | 60.00% | 25.10% |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Economic interest in joint venture |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition cost | 240 |  |  | 3 | 60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage share of convertible securities of subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Capital investment | 1,626 | 1,340 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,800 | 40,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project financing |  |  |  |  |  |  |  | 4,035 | 1,992 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of project financing representing Alcoa interest in venture |  |  |  |  |  |  |  | 1,013 | 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for pro rata share of pre-incorporation costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 22.0 | 34.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding receivable for labor and other employee-related expenses | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount invested by Alcoa and Aluminum Financing Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of investment by Alcoa and Aluminum Financing Limited, years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential forfeiture of letter of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350 | 60
Combined fair value of guarantees |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments | 1,524 | 1,244 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 565 |  |  | 285 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment commitment paid-to-date | 249 | 160 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other investments | 102 | 96 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 92 | 93 |  |  |  |  |  |  |  |  |  |
Fair value of guarantee included in other noncurrent liabilities and deferred credits | 436 |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service requirements, principal |  |  |  |  |  |  | 108 |  | 60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service requirements, interest maximum |  |  |  |  |  |  | $ 50 |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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