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Restructuring and Other Charges - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Employees
Aug. 31, 2014
Jun. 30, 2014
t
May. 31, 2014
t
May. 31, 2013
t
Sep. 30, 2015
USD ($)
Employees
t
Jun. 30, 2015
t
Sep. 30, 2014
USD ($)
Employees
Plant
Facilities
t
Mar. 31, 2014
t
Sep. 30, 2015
USD ($)
Employees
t
Sep. 30, 2014
USD ($)
Employees
Plant
Facilities
Dec. 31, 2014
Employees
Restructuring Cost and Reserve [Line Items]                        
Restructuring and other charges           $ 66,000,000   $ 209,000,000   $ 460,000,000 $ 780,000,000  
Restructuring and other charges, after-tax and noncontrolling interest           $ 30,000,000   175,000,000   $ 329,000,000 $ 503,000,000  
Capacity of lines under review | t         460,000              
Number of employees associated with layoff costs | Employees           370       970    
Number of employees associated with layoff costs | Employees                     245  
Capacity of lines under review period         15 months              
Minimum amount of cash payments expected to be paid beyond the end of the current annual period                   $ 50,000,000    
Maximum amount of cash payments expected to be paid beyond the end of the current annual period                   55,000,000    
Corporate [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and other charges           $ 9,000,000   $ 2,000,000   $ 38,000,000 $ 34,000,000  
Number of employees associated with layoff costs | Employees                   50    
Number of employees associated with layoff costs | Employees                     90  
Smelter [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Number of plants permanently shut down and demolished | Plant               2     3  
Number of plants temporarily curtailed | Plant                     2  
Rolling Mill [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Number of plants permanently shut down and demolished | Plant               2     2  
Primary Metals [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and other charges                   $ 80,000,000    
Restructuring and other charges, after-tax and noncontrolling interest                   $ 43,000,000    
Number of employees associated with layoff costs | Employees                   165    
Global Rolled Products [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Number of employees associated with layoff costs | Employees                   70    
Number of employees associated with layoff costs | Employees                     30  
Alumina [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Number of employees associated with layoff costs | Employees                     10  
Transportation and Construction Solutions [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Number of employees associated with layoff costs | Employees           355       410    
Number of employees associated with layoff costs | Employees                     50  
Corporate and Three Other Segments [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Number of employees associated with layoff costs | Employees           15            
Engineered Products and Solutions [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Number of employees associated with layoff costs | Employees                   275    
Number of employees associated with layoff costs | Employees                     65  
Pocos De Caldas Refinery [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Capacity of lines under review | t     200,000 62,000                
Reduction in production - result of market conditions, in mt per year | t             96,000          
Sao Luis Smelter [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Capacity of lines under review | t       85,000           74,000    
Sao Luis Smelter [Member] | Primary Metals [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Number of employees associated with layoff costs | Employees                   680    
Suriname [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and other charges           $ 42,000,000            
Restructuring and other charges, after-tax and noncontrolling interest           $ 20,000,000            
Capacity of lines under review | t           887,000       1,330,000    
Suriname [Member] | Alumina [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Number of employees associated with layoff costs | Employees                   120    
Sao Luis Smelter and Suriname [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Number of employees associated with layoff costs | Employees                   800    
Point Henry Smelter [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Power supplied as percentage of plant total power requirement   40.00%                    
Reduction in production - result of market conditions, in mt per year | t                 190,000      
Massena East Smelter [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Reduction in production - result of market conditions, in mt per year | t                 84,000      
Massena East Ny And Point Henry And Yennora [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Reduction in production - result of market conditions, in mt per year | t                 200,000      
Portovesme [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Capacity of lines under review | t               150,000        
Shutdown And Curtailment Actions [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and other charges               $ 60,000,000     $ 197,000,000  
Number of employees associated with layoff costs | Employees               1,780     1,780  
Asset impairment charges               $ 74,000,000     $ 165,000,000  
Inventory write-down - permanent shutdown and planned demolition of idled structures               33,000,000     67,000,000  
Inventory write-down, after-tax and non-controlling interests               27,000,000     47,000,000  
Accelerated depreciation               40,000,000     190,000,000  
Amount of book value of asset write off               $ 45,000,000     $ 178,000,000  
Shutdown And Curtailment Actions [Member] | Corporate [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Number of employees associated with layoff costs | Employees               30     30  
Shutdown And Curtailment Actions [Member] | Primary Metals [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Number of employees associated with layoff costs | Employees               1,200     1,200  
Shutdown And Curtailment Actions [Member] | Global Rolled Products [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Number of employees associated with layoff costs | Employees               470     470  
Shutdown And Curtailment Actions [Member] | Alumina [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Number of employees associated with layoff costs | Employees               80     80  
Shutdown And Curtailment Actions [Member] | Australia [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Number of facilities accelerated depreciation write off | Facilities               3     3  
Pension Costs [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and other charges               $ 18,000,000   $ 11,000,000 $ 18,000,000  
Asset Retirement Obligations [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and other charges                   45,000,000 95,000,000  
Other exit costs               40,000,000   45,000,000 95,000,000  
Environmental Remediation [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and other charges                   29,000,000 47,000,000  
Other exit costs               4,000,000   29,000,000 42,000,000  
Supplier And Customer Contract [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Other exit costs               1,000,000   8,000,000 41,000,000  
Layoff Costs [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and other charges           $ 33,000,000       62,000,000 18,000,000  
Restructuring and other charges, after-tax and noncontrolling interest           29,000,000       50,000,000 11,000,000  
Gain on Sale of Discontinued Operations [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and other charges               5,000,000        
Restructuring and other charges, after-tax and noncontrolling interest               4,000,000        
Gain on Sale of Discontinued Operations [Member] | Australia [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and other charges           18,000,000       18,000,000    
Restructuring and other charges, after-tax and noncontrolling interest           13,000,000       13,000,000    
Other Exit Costs [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and other charges           11,000,000   220,000,000   190,000,000 663,000,000  
Restructuring and other charges, after-tax and noncontrolling interest           5,000,000   186,000,000   120,000,000 426,000,000  
Other Miscellaneous Items [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and other charges           2,000,000   4,000,000   3,000,000 16,000,000  
Restructuring and other charges, after-tax and noncontrolling interest           9,000,000   2,000,000   13,000,000 9,000,000  
Small Layoff Reserves Related to Prior Periods [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and other charges           4,000,000       12,000,000    
Restructuring and other charges, after-tax and noncontrolling interest           2,000,000       9,000,000    
Divested Businesses [Member] | Russia [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and other charges                   161,000,000    
Restructuring and other charges, after-tax and noncontrolling interest                   151,000,000    
Shutdown Costs [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Asset impairment charges                   86,000,000    
Other exit costs                   82,000,000    
Inventory write-down - permanent shutdown and planned demolition of idled structures                   4,000,000    
Inventory write-down, after-tax and non-controlling interests                   2,000,000    
Shutdown Costs [Member] | Primary Metals [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and other charges           $ 11,000,000       $ 22,000,000    
Number of employees associated with layoff costs | Employees                   90    
Layoff Reserves Related to Prior Periods [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and other charges               10,000,000     17,000,000  
Restructuring and other charges, after-tax and noncontrolling interest               $ 9,000,000     13,000,000  
Smelter Curtailments [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and other charges                     67,000,000  
Restructuring and other charges, after-tax and noncontrolling interest                     $ 44,000,000  
Smelter Curtailments [Member] | Refinery [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Number of plants temporarily curtailed | Plant                     1  
Asset Impairment [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and other charges                     $ 33,000,000  
Restructuring and other charges, after-tax and noncontrolling interest                     $ 26,000,000  
Restructuring Programs Layoffs 2015 [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Approximate number of employees already laid off | Employees 1,240         1,240       1,240    
Number of positions separated | Employees 1,860                      
Cash payments made against the layoff reserves           $ 19,000,000       $ 34,000,000    
Restructuring Programs Layoffs 2014 [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Approximate number of employees already laid off | Employees 2,500         2,500       2,500    
Number of positions separated | Employees 2,870                     2,910
Cash payments made against the layoff reserves           $ 4,000,000       $ 60,000,000    
Restructuring Programs Layoffs 2013 [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Approximate number of employees already laid off | Employees 1,480         1,480       1,480    
Number of positions separated | Employees 1,530                      
Cash payments made against the layoff reserves           $ 1,000,000       $ 6,000,000