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Restructuring and Other Charges - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2014
t
Location
Employees
MT
Mar. 31, 2013
Mar. 31, 2014
Fusina Italy [Member]
t
Mar. 31, 2014
Point Henry Smelter [Member]
t
Mar. 31, 2014
Primary Metals [Member]
Employees
Mar. 31, 2013
Primary Metals [Member]
Employees
Mar. 31, 2014
Engineered Products and Solutions [Member]
Employees
Mar. 31, 2014
Corporate [Member]
Employees
Mar. 31, 2014
Global Rolled Products [Member]
Employees
Mar. 31, 2014
Alumina [Member]
Employees
Mar. 31, 2014
Layoff Costs [Member]
Mar. 31, 2013
Layoff Costs [Member]
Mar. 31, 2014
Layoff Costs [Member]
Primary Metals [Member]
Mar. 31, 2014
Other Miscellaneous Items [Member]
Mar. 31, 2013
Other Miscellaneous Items [Member]
Mar. 31, 2014
Restructuring Programs Layoffs 2014 [Member]
Employees
Mar. 31, 2014
Restructuring Programs Layoffs 2013 [Member]
Employees
Mar. 31, 2014
Other Exit Costs [Member]
Mar. 31, 2014
Smelter Curtailments [Member]
Location
Employees
Mar. 31, 2014
Asset Impairment [Member]
Mar. 31, 2014
Small Layoff Reserves Related to Prior Periods [Member]
Mar. 31, 2014
Permanent Shutdown and Planned Demolition of Idled Structures [Member]
Mar. 31, 2014
Operating Supplies [Member]
Mar. 31, 2014
Asset Retirement Obligations [Member]
Dec. 31, 2013
Asset Retirement Obligations [Member]
Mar. 31, 2014
Environmental Remediation [Member]
Dec. 31, 2013
Environmental Remediation [Member]
Mar. 31, 2014
Supplier And Customer Contract [Member]
Restructuring Cost and Reserve [Line Items]                                                        
Restructuring and other charges $ 461 $ 7                 $ 13 $ 3 $ 133 $ 15 $ 4     $ 336 $ 70 $ 33 $ 6     $ 55 $ 12 $ 42 $ 58  
Restructuring and other charges, after-tax and noncontrolling interests 274 5                 8 2   9 3     186 46 26 4              
Number of employees associated with layoff costs           60                                            
Number of U.S. locations permanently shutdown and planned demolition 2                                   1                  
Number of employees associated with layoff costs 40       1,230   110 60 470 90                 170                  
Reduction in production - result of market conditions, in metric tons per year 460,000   84,000 1,900,000                                                
Remaining smelting capacity subject to review 62,000                                                      
Additional smelting capacity subject to review 85,000                                                      
Number of mills permanently shutdown and planned demolition 2                                                      
Reduction in combined capacity 200,000                                                      
Number of employees associated with layoff costs 1,830                                                      
Other asset impairment charges 91                                                      
Accelerated depreciation 59                                                      
Other exit costs                                           123   55   38   30
Inventory write-down - permanent shutdown and planned demolition of idled structures                                             34          
Inventory write-down, after-tax and non-controlling interests                                             20          
Additional charges related to shutdown actions 220                                                      
Total number of employees already laid off                               15 1,260                      
Number of positions separated                               2,000 1,660                      
Cash payments made against the layoff reserves                               1 24                      
Minimum amount of cash payments expected to be paid beyond the end of the current annual period 35                                                      
Maximum amount of cash payments expected to be paid beyond the end of the current annual period $ 70