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Forward delivery contracts and financial instruments (Details)
 6 Months Ended
Jun. 30, 2014
Primary Aluminum Sales Contracts [Member]
Glencore Nordural Metal Agreement [Member]
t
Jun. 30, 2014
Primary Aluminum Sales Contracts [Member]
Southwire Metal Agreement [Member]
lb
Jun. 30, 2014
Long-Term Tolling Conctracts [Member]
Glencore Toll Agreement 1 [Member]
t
Jun. 30, 2014
Long-Term Tolling Conctracts [Member]
Glencore Toll Agreement 2 [Member]
t
Jun. 30, 2014
Other Forward Delivery Contracts [Member]
t
Dec. 31, 2013
Other Forward Delivery Contracts [Member]
t
Jun. 30, 2014
Glencore [Member]
Other Forward Delivery Contracts [Member]
t
Dec. 31, 2013
Glencore [Member]
Other Forward Delivery Contracts [Member]
t
Supply Commitment [Line Items]                
Customer Glencore [1] Southwire [2] Glencore Glencore        
Volume All primary aluminum produced at Grundartangi, net of tolling and other sales commitments [1] 216 million pounds per year (high conductivity molten aluminum) [2] 90,000 tonnes per year ("tpy") 49,000 tpy        
Volume (in tpy and lbs per year) 155,000 216,000,000 90,000 49,000        
Volume adjustment (in percent)   4.00%            
Term January 1, 2014 through December 31, 2017 [1] January 1, 2014 through December 31, 2014 [2] Through July 2016 Through December 31, 2014        
Pricing Variable, based on LME and European Duty Paid premium [1] Variable, based on U.S. Midwest Transaction Price [2] Variable, based on LME and European Duty Paid premium Variable, based on LME and European Duty Paid premium        
Other forward delivery contracts to sell primary aluminum (in tonnes)         106,530 118,373 48,808 20,008
Other forward delivery contracts to sell primary aluminum at fixed price (in tonnes)         207 0 31 0
[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.