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Forward delivery contracts and financial instruments (Details)
 12 Months Ended
Dec. 31, 2013
Long-Term Tolling Contracts [Member]
Glencore Toll Agreement 1 [Member]
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Dec. 31, 2013
Long-Term Tolling Contracts [Member]
Glencore Toll Agreement 2 [Member]
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Dec. 31, 2013
Primary Aluminum Sales Contracts [Member]
Glencore Nordural Metal Agreement [Member]
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Dec. 31, 2013
Primary Aluminum Sales Contracts [Member]
Southwire Metal Agreement [Member]
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Dec. 31, 2013
Other Forward Delivery Contracts [Member]
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Dec. 31, 2012
Other Forward Delivery Contracts [Member]
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Dec. 31, 2013
Glencore [Member]
Other Forward Delivery Contracts [Member]
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Dec. 31, 2012
Glencore [Member]
Other Forward Delivery Contracts [Member]
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Supply Commitment [Line Items]                
Annual Primary Aluminum Physical Delivery Contract_Maximum 90,000 40,000 155,000 216,000,000        
Customer Glencore Glencore Glencore [1] Southwire [2]        
Volume 90,000 tpy 40,000 tpy All primary aluminum produced at Grundartangi, net of tolling and other sales commitments [1] 216 million pounds per year (high conductivity molten aluminum) [2]        
Term Through July 31, 2016 Through December 31, 2014 January 1, 2014 through December 31, 2017 [1] January 1, 2014 through December 31, 2014 [2]        
Pricing Variable, based on LME and European Duty Paid premium Variable, based on LME and European Duty Paid premium Variable, based on LME and European Duty Paid premium [1] Variable, based on U.S. Midwest Transaction Price [2]        
Other forward delivery contracts to sell primary aluminum (in tonnes)         118,373 88,827 20,008 1,811
Annual Primary Aluminum Physical Delivery Contract_Percentage Adjustment       4.00%        
[1] The Glencore Grundartangi Metal Agreement is for all metal produced at Grundartangi from 2014 through 2017 less commitments under existing tolling and other sales contracts. Grundartangi currently estimates that it will sell Glencore approximately 155,000 tonnes of aluminum under this agreement in 2014.
[2] Southwire may, at its option, increase the volume purchased under the agreement by up to four percent by adjusting their monthly metal commitment.