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Restructuring and Other Charges - Additional Information (Detail)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Employees
Jun. 30, 2016
USD ($)
Employees
Jun. 30, 2015
USD ($)
Employees
t
Jun. 30, 2016
USD ($)
Employees
Jun. 30, 2015
USD ($)
Employees
Dec. 31, 2015
USD ($)
Employees
Restructuring Cost and Reserve [Line Items]            
Restructuring and other charges   $ 23,000,000 $ 217,000,000 $ 116,000,000 $ 394,000,000  
Restructuring and other charges after tax and noncontrolling interest   16,000,000 141,000,000 77,000,000 299,000,000  
Other costs       30,000,000   $ 291,000,000
Inventory write down         4,000,000  
Inventory write down after tax and noncontrolling interests         2,000,000  
Minimum amount of cash payments expected to be paid beyond the end of the current annual period       25,000,000    
Maximum amount of cash payments expected to be paid beyond the end of the current annual period       30,000,000    
Corporate [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and other charges   (3,000,000) $ 24,000,000 (3,000,000) 29,000,000  
Warrick Smelter, Wenatchee Smelter and Point Comfort [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and other charges   8,000,000   86,000,000    
Restructuring and other charges after tax and noncontrolling interest   6,000,000   56,000,000    
Warrick, IN Smelter [Member]            
Restructuring Cost and Reserve [Line Items]            
Other costs   9,000,000   36,000,000    
Inventory write down   2,000,000   5,000,000    
Inventory write down after tax and noncontrolling interests   1,000,000   3,000,000    
Other related costs   1,000,000   $ 2,000,000    
Suriname [Member]            
Restructuring Cost and Reserve [Line Items]            
Capacity of lines under review | t     443,000      
Suriname [Member] | Alumina [Member]            
Restructuring Cost and Reserve [Line Items]            
Number of positions | Employees     120      
Rolling Mill in Russia [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and other charges         179,000,000  
Restructuring and other charges after tax and noncontrolling interest         115,000,000  
Sao Luis Smelter [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and other charges         38,000,000  
Restructuring and other charges after tax and noncontrolling interest         $ 23,000,000  
Number of positions | Employees         800  
Sao Luis Smelter [Member] | Primary Metals [Member]            
Restructuring Cost and Reserve [Line Items]            
Number of positions | Employees         680  
Sao Luis Smelter [Member] | Alumina [Member]            
Restructuring Cost and Reserve [Line Items]            
Number of positions | Employees         120  
Pocos de Caldas Smelter [Member]            
Restructuring Cost and Reserve [Line Items]            
Capacity closure | t     96,000      
Point Henry Smelter [Member]            
Restructuring Cost and Reserve [Line Items]            
Percentage of power supply       40.00%    
Asset Retirement Obligation Costs [Member] | Warrick, IN Smelter [Member]            
Restructuring Cost and Reserve [Line Items]            
Other costs       $ 7,000,000    
Restructuring And Related Charges [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and other charges   15,000,000        
Restructuring and other charges after tax and noncontrolling interest   11,000,000        
Other Miscellaneous Items [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and other charges   8,000,000 $ 5,000,000 8,000,000 $ 3,000,000  
Restructuring and other charges after tax and noncontrolling interest   4,000,000 3,000,000 4,000,000 2,000,000  
Other Adjustments [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and other charges   8,000,000 1,000,000 12,000,000 8,000,000  
Restructuring and other charges after tax and noncontrolling interest   $ 5,000,000 1,000,000 8,000,000 7,000,000  
Restructuring Programs Layoffs 2015 [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and other charges       34,000,000    
Restructuring and other charges after tax and noncontrolling interest       $ 25,000,000    
Number of positions | Employees 5,000 540   1,100   5,200
Approximate number of employees already laid off | Employees 3,800 3,800   3,800    
Cash payments made against the layoff reserves   $ 30,000,000   $ 92,000,000    
Restructuring Programs Layoffs 2015 [Member] | Engineered Products and Solutions [Member]            
Restructuring Cost and Reserve [Line Items]            
Number of positions | Employees   300   800    
Restructuring Programs Layoffs 2015 [Member] | Transportation and Construction Solutions [Member]            
Restructuring Cost and Reserve [Line Items]            
Number of positions | Employees   240   240    
Restructuring Programs Layoffs 2015 [Member] | Primary Metals [Member]            
Restructuring Cost and Reserve [Line Items]            
Number of positions | Employees       30    
Asset Impairment and Accelerated Depreciation [Member] | Warrick, IN Smelter [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and other charges       $ 70,000,000    
Severance costs   $ 1,000,000   20,000,000    
Other costs   9,000,000   36,000,000    
Contract Termination [Member] | Warrick, IN Smelter [Member]            
Restructuring Cost and Reserve [Line Items]            
Other costs   $ 10,000,000   27,000,000    
Other Exit Costs [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and other charges     179,000,000   82,000,000  
Restructuring and other charges after tax and noncontrolling interest     115,000,000      
Other costs       $ (1,000,000)   $ 231,000,000
Restructuring Programs Layoffs 2014 [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and other charges     16,000,000   29,000,000  
Restructuring and other charges after tax and noncontrolling interest     $ 13,000,000   $ 21,000,000  
Number of positions | Employees 2,700   390   600 2,870
Capacity of lines under review | t     74,000      
Approximate number of employees already laid off | Employees 2,600 2,600   2,600    
Cash payments made against the layoff reserves   $ 1,000,000   $ 3,000,000    
Restructuring Programs Layoffs 2014 [Member] | Corporate [Member]            
Restructuring Cost and Reserve [Line Items]            
Number of positions | Employees         50  
Restructuring Programs Layoffs 2014 [Member] | Engineered Products and Solutions [Member]            
Restructuring Cost and Reserve [Line Items]            
Number of positions | Employees     210   290  
Restructuring Programs Layoffs 2014 [Member] | Transportation and Construction Solutions [Member]            
Restructuring Cost and Reserve [Line Items]            
Number of positions | Employees         50  
Restructuring Programs Layoffs 2014 [Member] | Primary Metals [Member]            
Restructuring Cost and Reserve [Line Items]            
Number of positions | Employees     150   150  
Restructuring Programs Layoffs 2014 [Member] | Global Rolled Products [Member]            
Restructuring Cost and Reserve [Line Items]            
Number of positions | Employees     30   60  
Restructuring Programs Layoffs 2014 [Member] | Suriname [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and other charges     $ 18,000,000      
Restructuring and other charges after tax and noncontrolling interest     10,000,000      
Post Closing Adjustments [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and other charges     10,000,000      
Restructuring and other charges after tax and noncontrolling interest     $ 7,000,000      
Divested Businesses [Member] | Global Rolled Products [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and other charges         $ 159,000,000  
Restructuring and other charges after tax and noncontrolling interest         149,000,000  
Shutdown and Curtailment Actions [Member]            
Restructuring Cost and Reserve [Line Items]            
Asset impairment charges         $ 86,000,000  
Number of employees associated with layoff costs | Employees         100  
Layoff Costs [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and other charges         $ 11,000,000  
Other costs       31,000,000   $ 60,000,000
Asset Retirement Obligations [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and other charges       $ 7,000,000 45,000,000 76,000,000
Environmental Remediation [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and other charges         29,000,000 $ 86,000,000
Supplier and Customer Contract [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring and other charges         $ 8,000,000  
Restructuring Programs Layoffs 2016 [Member]            
Restructuring Cost and Reserve [Line Items]            
Number of positions | Employees 1,100          
Approximate number of employees already laid off | Employees 730 730   730    
Cash payments made against the layoff reserves   $ 9,000,000   $ 11,000,000