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Forward Delivery Contracts and Financial Instruments (Details) (Forward Contracts [Member])
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Glencore Metal Agreement [Member]
Dec. 31, 2011
Glencore Sweep Agreement [Member]
Dec. 31, 2011
Glencore Nordural Metal Agreement [Member]
Dec. 31, 2011
Southwire Metal Agreement [Member]
Dec. 31, 2011
Billiton Tolling Agreement [Member]
Dec. 31, 2011
Glencore Toll Agreement 1 [Member]
Dec. 31, 2011
Glencore Toll Agreement 2 [Member]
Supply Commitment [Line Items]                  
Customer     Glencore [1] Glencore [2] Glencore Southwire [3] BHP Billiton [4] Glencore [4] Glencore [4]
Volume     20,400 mtpy [1] Surplus metal produced in the United States [2] 16,000mtpy 240 million pounds per year (high conductivity molten aluminum) [3] 130,000 mtpy [4] 90,000 mtpy [4] 40,000 mtpy [4]
Term     Through December 31, 2013 [1] Through December 31, 2012 [2] Through December 31, 2012 Through December 31, 2013 [3] Through December 31, 2013 [4] Through July 31, 2016 [4] Through December 31, 2014 [4]
Pricing     Variable, based on U.S. Midwest market [1] Variable, based on U.S. Midwest market [2] Variable, based on LME Variable, based on U.S. Midwest market [3] LME-based [4] LME-based [4] LME-based [4]
Other forward delivery contracts to sell primary aluminum (in metric tons) 41,504 47,926              
Fixed price commitments on these other forward delivery contracts (in metric tons) 41 117              
[1] We account for the Glencore Metal Agreement as a derivative instrument under ASC 815. Under the Glencore Metal Agreement, pricing is based on then-current market prices, adjusted by a negotiated U.S. Midwest premium with a cap and a floor to the current U.S. Midwest premium.
[2] The Glencore Sweep Agreement is for all metal produced in the U.S. in 2011, less existing sales agreements and high-purity metal sales. The term of the contract may be extended for one year upon mutual agreement.
[3] The Southwire Metal Agreement contract contains termination rights in the event of a partial or full curtailment of the Hawesville facility.
[4] Grundartangi's tolling revenues include a premium based on the EU import duty for primary aluminum.