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Contingencies and Commitments - Additional Information - 1 (Detail)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2007
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Jun. 12, 2012
USD ($)
Jun. 12, 2012
EUR (€)
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
Recurring Costs of Managing Hazardous Substances and Environmental Programs [Member]
Jan. 31, 2007
Spanish Government [Member]
Jan. 31, 2007
Tariffs Granted by Spain [Member]
USD ($)
Jan. 31, 2007
Tariffs Granted by Spain [Member]
EUR (€)
Dec. 31, 2013
Massena West, NY [Member]
USD ($)
Dec. 31, 2012
Massena West, NY [Member]
USD ($)
Dec. 31, 2012
Smelter Sites [Member]
USD ($)
Dec. 31, 2012
Smelter Sites [Member]
Canada and Norway [Member]
USD ($)
Dec. 31, 2012
East St. Louis, IL Site [Member]
USD ($)
Dec. 31, 2005
East St. Louis, IL Site [Member]
USD ($)
Dec. 31, 2013
East St. Louis, IL Site [Member]
USD ($)
Dec. 31, 2012
Sherwin, TX site [Member]
USD ($)
Dec. 31, 2013
Sherwin, TX site [Member]
USD ($)
Dec. 31, 2013
Other Sites [Member]
USD ($)
Dec. 31, 2012
Other Sites [Member]
USD ($)
Dec. 31, 2013
U.S. Smelters [Member]
USD ($)
Jun. 30, 2012
Grasse River [Member]
USD ($)
Dec. 31, 2013
Grasse River [Member]
USD ($)
Dec. 31, 2012
Grasse River [Member]
USD ($)
Dec. 31, 2013
Massena West, NY and Baie Comeau, Quebec, Canada [Member]
USD ($)
Loss Contingencies [Line Items]                                                      
Number of years operating under a power supply structure                 9 years                                    
Days provided to submit observations and comments to the EC 30 days                                                    
Loss contingency, range of possible loss, maximum       $ 418 € 303         $ 95 € 70                                
Number of cleanup locations   More than 100                                                  
Remediation reserve balance   509 532                 241 243     26   24 36 35              
Remediation reserve balance, classified as a current liability   48 74                                                
Remediation reserve increase                         206 30   14 15             37 18 128  
Remediation reserve adjustment                         165   45 14         6 12 12       12
Increase in remediation reserve                                     30                
Payments related to remediation expenses applied against the reserve   40 22                                                
Increase and decrease in reserves due to effects of foreign currency translation   (1) 1                                                
Percentage of cost of goods sold               2.00%                                      
Remediation alternative estimated cost   243                                                  
Adjustment of reserve related to grass river                       $ 0                              
Planning and design phase period           2 years 3 years                                        
Actual remediation fieldwork period   4 years                                                  
Majority of the project funding Period           2016 2020