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Debt (Details) (USD $)
1 Months Ended3 Months Ended9 Months Ended6 Months Ended1 Months Ended9 Months Ended1 Months Ended
May 31, 2011
Apr. 30, 2011
Jun. 30, 2011
Sep. 30, 2011
Oct. 31, 2011
Jul. 25, 2011
May 31, 2011
Maximum [Member]
6% Notes, Due 2013 [Member]
Jun. 30, 2011
Maximum [Member]
5.4% Notes, Due 2021
Jun. 30, 2011
Minimum [Member]
5.4% Notes, Due 2021
May 31, 2011
5.375% Notes, Due 2013 [Member]
Sep. 30, 2011
5.375% Notes, Due 2013 [Member]
May 31, 2011
6% Notes, Due 2013 [Member]
Apr. 30, 2011
5.4% Notes, Due 2021
Amount of public debt offering   $ 515,000,000        $ 1,250,000,000
Interest rate on notes issued         5.375% 6.00%5.40%
Debt instrument maturity period         2013 20132021
Net proceeds from the public debt offering            1,241,000,000
Early retirement of outstanding notes 101,000,000          881,000,000
Notice period for debt redemption, in days       60.030.0    
Repurchase of notes            101.00%
Aggregate outstanding principal amount    30,000,000500   269,000,000 328,000,000 
Remaining outstanding debt of Alcoa         284,000,000   
Cash paid for redemption of outstanding debt972,000,000            
Principal amount of debt881,000,000     400,000,000      
Purchase premium74,000,000            
Accrued and unpaid interest17,000,000            
Remaining outstanding debt           422,000,000 
Interest rate swaps, notional amount  550,000,000       550,000,000  
Gain on termination of interest rate swaps  33,000,000       33,000,000  
Debt instrument fee amount   0.25%         
Applicable margin on base rate loans, minimum   0.50%         
Applicable margin base rate loans, maximum   1.50%         
Unsecured revolving credit   3,750         
Debt Instrument, Principal Outstanding    30,000,000500   269,000,000 328,000,000 
Letter of limit sublimit     1,000       
Undrawn and terminated amount     $ 3,275