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Preferred And Common Stock (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2011
Jan. 31, 2010
Dec. 31, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2006
Class of Stock [Line Items]              
Common stock authorized     1,800,000,000 1,800,000,000      
Common stock, par value per share     $ 1 $ 1      
Common stock issued, in shares     1,177,906,557 1,177,906,557 1,141,387,994    
Common stock, dividends yield     $ 0.03 $ 0.12 $ 0.12 $ 0.26  
Newly issued common stock, shares 36,518,563 44,313,146          
Newly issued common stock, par value $ 16.43 $ 13.54          
Newly issued common stock, aggregate value $ 600 $ 600          
Percentage of funded status of pension plans 80.00%            
Average period of dividend yield       one-year      
Repurchase of common stock, shares, maximum             217,000,000
Number of years of sales and profitability targets to ascertain grant of performance stock awards       3      
Number of shares reserved for issuance upon conversion of convertible notes, shares       110,000,000      
Number of shares reserved for issuance under Alcoa's stock-based compensation plans, shares       93,000,000      
Percentage of repurchase of common stock, maximum             25.00%
Repurchased stock, shares             101,000,000
Expense related to the acceleration of expense related to retirement-eligible employees       18 19 21  
Common stock dividend per share before global economic downturn           $ 0.17  
Common stock dividend per share after global economic downturn           $ 0.03  
Total intrinsic value of options exercised       34 8    
Cash received from options exercised       37 13    
Total tax benefit from exercises of stock options       11 2    
Unrecognized compensation costs on non-vested stock option grants (pretax)       21      
Unrecognized compensation costs on non-vested stock option awards (pretax)     $ 44 $ 44      
Unrecognized compensation costs on non-vested awards, weighted average period of recognition in years       1.6      
Stock Awards [Member]
              
Class of Stock [Line Items]              
Vesting period       three      
Preferred Class A [Member]
              
Class of Stock [Line Items]              
Preferred stock, shares authorized     660,000 660,000      
Preferred stock, par value per share     $ 100 $ 100      
Cumulative Dividend Preference Per Share       $ 3.75      
Preferred stock, shares outstanding     546,024 546,024      
Preferred Class B [Member]
              
Class of Stock [Line Items]              
Preferred stock, shares authorized     10,000,000 10,000,000      
Preferred stock, par value per share     $ 1 $ 1      
Prior To 2009 [Member]
              
Class of Stock [Line Items]              
Average period of dividend yield       five-year