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Segment And Geographic Area Information (Schedule Of Geographic Information For Sales) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales $ 5,989 $ 6,419 $ 6,585 $ 5,958 $ 5,652 $ 5,287 $ 5,187 $ 4,887 $ 24,951 $ 21,013 $ 18,439
U.S. [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 12,295 [1] 10,560 [1] 9,546 [1]
Australia [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 3,587 2,842 2,287
Spain [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 1,487 1,234 1,099
Brazil [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 1,371 1,182 897
Netherlands [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 1,025 [2] 940 [2] 1,002 [2]
Norway [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 927 809 477
France [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 825 662 669
Russia [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 761 584 383
Hungary [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 665 505 419
Italy [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 537 418 394
United Kingdom [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 412 331 379
China [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 283 188 156
Germany [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 229 231 260
Other Geographical Regions [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 547 $ 527 $ 471
[1] Sales that occurred in the U.S. include a portion of alumina from Alcoa's refineries in Suriname, Brazil, Australia, and Jamaica and aluminum from the Company's smelters in Canada.
[2] Sales that occurred in the Netherlands include aluminum from Alcoa's smelter in Iceland.