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Reconciliation Of Information Used To Compute Basic And Diluted EPS (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings Per Share Basic And Diluted By Common Class [Line Items]        
(Loss) income from continuing operations attributable to Alcoa common shareholders $ (2) $ 326 $ 92 $ 635
Less: preferred stock dividends declared     1 1
(Loss) income from continuing operations available to common equity (2) 326 91 634
Less: dividends and undistributed earnings allocated to participating securities   1   2
(Loss) income from continuing operations available to Alcoa common shareholders - basic (2) 325 91 632
Add: interest expense related to convertible notes   8   15
(Loss) income from continuing operations available to Alcoa common shareholders - diluted $ (2) $ 333 $ 91 $ 647
Average shares outstanding - basic 1,067 1,064 1,066 1,058
Stock options   9 4 9
Stock and performance awards   3 5 3
Convertible notes   89   89
Average shares outstanding - diluted 1,067 1,165 1,075 1,159