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Debt (Narrative) (Details)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
May 31, 2011
USD ($)
Aug. 31, 2010
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Jan. 31, 2012
Jul. 25, 2011
USD ($)
Aug. 31, 2010
Notes Due 2011 [Member]
USD ($)
Dec. 31, 2010
Notes Due 2012 [Member]
USD ($)
Aug. 31, 2010
Notes Due 2012 [Member]
USD ($)
Dec. 31, 2011
6.50% Notes, Due 2011 [Member]
Aug. 31, 2010
6.50% Notes, Due 2011 [Member]
Apr. 30, 2011
5.40% Notes, Due 2021 [Member]
USD ($)
Dec. 31, 2011
5.40% Notes, Due 2021 [Member]
USD ($)
Dec. 31, 2010
5.40% Notes, Due 2021 [Member]
USD ($)
May 31, 2011
6% Notes, Due 2013 [Member]
USD ($)
Dec. 31, 2011
6% Notes, Due 2013 [Member]
USD ($)
Dec. 31, 2010
6% Notes, Due 2013 [Member]
USD ($)
Aug. 31, 2010
7.375% Notes, Due 2010 [Member]
USD ($)
Aug. 31, 2010
6.15% Notes, Due 2020 [Member]
USD ($)
Dec. 31, 2011
6.15% Notes, Due 2020 [Member]
USD ($)
Dec. 31, 2010
6.15% Notes, Due 2020 [Member]
USD ($)
Dec. 31, 2011
6% Notes, Due 2012 [Member]
USD ($)
Dec. 31, 2010
6% Notes, Due 2012 [Member]
USD ($)
Aug. 31, 2010
6% Notes, Due 2012 [Member]
May 31, 2011
5.375% Notes, Due 2013 [Member]
USD ($)
Aug. 31, 2010
5.375% Notes, Due 2013 [Member]
USD ($)
Dec. 31, 2011
5.375% Notes, Due 2013 [Member]
Dec. 31, 2010
5.375% Notes, Due 2013 [Member]
USD ($)
Dec. 31, 2011
Revolving Credit Facility [Member]
Dec. 31, 2011
Loan Agreement With BNDES [Member]
USD ($)
Dec. 31, 2011
Loan Agreement With BNDES [Member]
BRL
Dec. 31, 2010
Loan Agreement With BNDES [Member]
USD ($)
Dec. 31, 2010
Loan Agreement With BNDES [Member]
BRL
Dec. 31, 2011
Loan Agreement With BNDES [Member]
Two Of The Subloans [Member]
BRL
Jun. 30, 2008
Loan Agreement With BNDES [Member]
Three Of The Subloans [Member]
USD ($)
Jun. 30, 2008
Loan Agreement With BNDES [Member]
Three Of The Subloans [Member]
BRL
Dec. 31, 2011
Loan Agreement With BNDES [Member]
Third Subloan [Member]
BRL
Dec. 31, 2011
Commercial Paper [Member]
USD ($)
Dec. 31, 2010
Commercial Paper [Member]
USD ($)
Dec. 31, 2009
Commercial Paper [Member]
May 31, 2011
Debt Principal [Member]
USD ($)
Aug. 31, 2010
Debt Principal [Member]
USD ($)
May 31, 2011
Debt Accrued And Unpaid Interest [Member]
USD ($)
Aug. 31, 2010
Debt Accrued And Unpaid Interest [Member]
USD ($)
Apr. 30, 2011
Brazil Bauxite Mine [Member]
5.40% Notes, Due 2021 [Member]
USD ($)
Aug. 31, 2010
Brazil Bauxite Mine [Member]
6.15% Notes, Due 2020 [Member]
USD ($)
Dec. 31, 2011
Maximum [Member]
5.40% Notes, Due 2021 [Member]
Aug. 31, 2010
Maximum [Member]
6.15% Notes, Due 2020 [Member]
Dec. 31, 2011
Maximum [Member]
Commercial Paper [Member]
Dec. 31, 2011
Minimum [Member]
5.40% Notes, Due 2021 [Member]
Aug. 31, 2010
Minimum [Member]
6.15% Notes, Due 2020 [Member]
Dec. 31, 2011
Minimum [Member]
Commercial Paper [Member]
Dec. 31, 2011
First Loans [Member]
Subloan Of $233 [Member]
Dec. 31, 2011
First Loans [Member]
Subloan Of $15 [Member]
Mar. 31, 2008
First Loans [Member]
First Loan Agreement [Member]
USD ($)
Mar. 31, 2008
First Loans [Member]
First Loan Agreement [Member]
BRL
Mar. 31, 2008
First Loans [Member]
First Loan Agreement [Member]
Four Of The Subloans [Member]
USD ($)
Mar. 31, 2008
First Loans [Member]
First Loan Agreement [Member]
Four Of The Subloans [Member]
BRL
Dec. 31, 2011
First Loans [Member]
First Loan Agreement [Member]
Four Of The Subloans [Member]
Dec. 31, 2010
First Loans [Member]
First Loan Agreement [Member]
Four Of The Subloans [Member]
Jun. 30, 2008
First Loans [Member]
First Loan Agreement [Member]
Fifth Subloan [Member]
USD ($)
Jun. 30, 2008
First Loans [Member]
First Loan Agreement [Member]
Fifth Subloan [Member]
BRL
Dec. 31, 2011
First Loans [Member]
First Loan Agreement [Member]
Fifth Subloan [Member]
Dec. 31, 2010
First Loans [Member]
First Loan Agreement [Member]
Fifth Subloan [Member]
Dec. 31, 2011
First Loans [Member]
First Loan Agreement [Member]
Subloan Of $233 [Member]
USD ($)
Dec. 31, 2011
First Loans [Member]
First Loan Agreement [Member]
Subloan Of $233 [Member]
BRL
Dec. 31, 2010
First Loans [Member]
First Loan Agreement [Member]
Subloan Of $233 [Member]
USD ($)
Dec. 31, 2010
First Loans [Member]
First Loan Agreement [Member]
Subloan Of $233 [Member]
BRL
Dec. 31, 2011
First Loans [Member]
First Loan Agreement [Member]
Subloan Of $15 [Member]
USD ($)
Dec. 31, 2011
First Loans [Member]
First Loan Agreement [Member]
Subloan Of $15 [Member]
BRL
Dec. 31, 2010
First Loans [Member]
First Loan Agreement [Member]
Subloan Of $15 [Member]
USD ($)
Dec. 31, 2010
First Loans [Member]
First Loan Agreement [Member]
Subloan Of $15 [Member]
BRL
Dec. 31, 2011
First Loans [Member]
Second Loan Agreement [Member]
USD ($)
Dec. 31, 2011
First Loans [Member]
Second Loan Agreement [Member]
BRL
Dec. 31, 2010
First Loans [Member]
Second Loan Agreement [Member]
Dec. 31, 2011
First Loans [Member]
Second Loan Agreement [Member]
Two Of The Subloans [Member]
Dec. 31, 2011
First Loans [Member]
Second Loan Agreement [Member]
Third Subloan [Member]
USD ($)
Dec. 31, 2011
First Loans [Member]
Second Loan Agreement [Member]
Third Subloan [Member]
BRL
Dec. 31, 2011
First Loans [Member]
Second Loan Agreement [Member]
Subloan Of $339 [Member]
USD ($)
Dec. 31, 2011
First Loans [Member]
Second Loan Agreement [Member]
Subloan Of $339 [Member]
BRL
Dec. 31, 2010
First Loans [Member]
Second Loan Agreement [Member]
Subloan Of $339 [Member]
USD ($)
Dec. 31, 2010
First Loans [Member]
Second Loan Agreement [Member]
Subloan Of $339 [Member]
BRL
Dec. 31, 2011
First Loans [Member]
Second Loan Agreement [Member]
Subloan Of $35 [Member]
USD ($)
Dec. 31, 2011
First Loans [Member]
Second Loan Agreement [Member]
Subloan Of $35 [Member]
BRL
Dec. 31, 2010
First Loans [Member]
Second Loan Agreement [Member]
Subloan Of $35 [Member]
USD ($)
Dec. 31, 2010
First Loans [Member]
Second Loan Agreement [Member]
Subloan Of $35 [Member]
BRL
Dec. 31, 2011
First Loans [Member]
Loan Agreement With BNDES [Member]
Two Of The Subloans [Member]
USD ($)
Dec. 31, 2011
First Loans [Member]
Loan Agreement With BNDES [Member]
Two Of The Subloans [Member]
BRL
Dec. 31, 2011
First Loans [Member]
Maximum [Member]
May 31, 2009
Second Loans [Member]
First Loan Agreement [Member]
USD ($)
May 31, 2009
Second Loans [Member]
First Loan Agreement [Member]
BRL
May 31, 2009
Second Loans [Member]
First Loan Agreement [Member]
Two Of The Subloans [Member]
USD ($)
May 31, 2009
Second Loans [Member]
First Loan Agreement [Member]
Two Of The Subloans [Member]
BRL
Dec. 31, 2011
Second Loans [Member]
First Loan Agreement [Member]
Two Of The Subloans [Member]
Dec. 31, 2010
Second Loans [Member]
First Loan Agreement [Member]
Two Of The Subloans [Member]
USD ($)
Dec. 31, 2010
Second Loans [Member]
First Loan Agreement [Member]
Two Of The Subloans [Member]
BRL
May 31, 2009
Second Loans [Member]
First Loan Agreement [Member]
Four Of The Subloans [Member]
USD ($)
May 31, 2009
Second Loans [Member]
First Loan Agreement [Member]
Four Of The Subloans [Member]
BRL
Dec. 31, 2011
Second Loans [Member]
First Loan Agreement [Member]
Four Of The Subloans [Member]
Dec. 31, 2010
Second Loans [Member]
First Loan Agreement [Member]
Four Of The Subloans [Member]
USD ($)
Dec. 31, 2010
Second Loans [Member]
First Loan Agreement [Member]
Four Of The Subloans [Member]
BRL
May 31, 2009
Second Loans [Member]
Second Loan Agreement [Member]
USD ($)
May 31, 2009
Second Loans [Member]
Second Loan Agreement [Member]
BRL
Dec. 31, 2011
Second Loans [Member]
Second Loan Agreement [Member]
Dec. 31, 2010
Second Loans [Member]
Second Loan Agreement [Member]
USD ($)
Dec. 31, 2010
Second Loans [Member]
Second Loan Agreement [Member]
BRL
Dec. 31, 2011
Second Loans [Member]
Second Loan Agreement [Member]
Two Of The Subloans [Member]
USD ($)
Dec. 31, 2011
Second Loans [Member]
Second Loan Agreement [Member]
Two Of The Subloans [Member]
BRL
Dec. 31, 2010
Second Loans [Member]
Second Loan Agreement [Member]
Two Of The Subloans [Member]
USD ($)
Dec. 31, 2010
Second Loans [Member]
Second Loan Agreement [Member]
Two Of The Subloans [Member]
BRL
Debt Instrument [Line Items]                                                                                                                                                                                                                              
Principal amount of long-term debt maturing in year 2012     $ 445                                                                                                                                                                                                                        
Principal amount of long-term debt maturing in year 2013     549                                                                                                                                                                                                                        
Principal amount of long-term debt maturing in year 2014     743                                                                                                                                                                                                                        
Principal amount of long-term debt maturing in year 2015     45                                                                                                                                                                                                                        
Principal amount of long-term debt maturing in year 2016     26                                                                                                                                                                                                                        
Senior debt securities issued under shelf registration statements     1,250 3,075                 1,250             1,000                                                                                                                                                                                      
Debt instrument, maturity date                     2011     2021     2013       2020   2012         2013   July 25, 2016                                                                                                                                                                  
Net proceeds received from public debt offering     1,256 1,126 1,049               1,241             993                                                                                                                                                                                      
Early repayment of outstanding notes                         881             825           284                                       101 88                                                                                                                                
Option to redeem notes, period prior to notice to holders, days                                                                                               60 60   30 30                                                                                                                      
Debt repurchase price, percentage of aggregate principal                           101.00%           101.00%                                                                                                                                                                                      
Tender offer completed, debt amount                               400                                                                                                                                                                                              
Purchase premiums repaid recorded as interest expense 74 42                                                                                                                                                                                                                          
Gain resulting from termination of interest rate swaps, recorded as interest expense   28 33                                                                                                                                                                                                                        
Payments on long-term debt 972 878 1,194 1,757 156                           511                                             881 825 17 11                                                                                                                                    
Long-term debt, interest rate           6.00%           6.50%   5.40%     6.00%   7.375%   6.15%   6.00%   6.00%     5.375%                                                                                                                                                                      
Long-term debt     9,085 9,073                   1,250      422 750     1,000 1,000 322 322         553                                                                                                                                                                    
Debt instrument maturity date, description                                                                             matures at various times within one year                                                                                                                                                
Principal and interest                                                                     667     20                                                                                                                                                  
Revolving credit facility, amount outstanding             3,750                                               355 661 394 662                                                               55 102 186 312 3 7 10 17             191 356 280 469 23 42 29 48                                                
Commitment on loan agreement                                                                       397 687                                     248 500                                 374 650                               321 750                     86 200              
Interest on subloans                                                                                                                   233 470     15 30                             35 61                 339 589       257 600       64 150       69 160       17 40    
Percentage of average cost incurred in raising capital                                                                                                                               3.59% 4.16%                                                                                            
Long-term interest rate                                                                       1.48% 1.48%   0.60% 0.70% 3.10%                                     6.00% 0.06%     2.40%                       2.02% 1.99%                                                                    
Weighted-average margin on long term debt                                                                                                                       2.13%                                                                                                      
Outstanding borrowings                                                                             3,275                                                                                                                                                
Letters of credit sublimit under credit facility             1,000                                                                                                                                                                                                                
Weighted-average interest rate, outstanding borrowings                                                             7.50% 7.50% 7.52% 7.52%                                       8.13% 5.99%                         8.13% 8.13%     6.56% 6.56%             7.99% 7.99% 7.99% 7.99% 5.61% 5.61% 6.18% 6.18%               1.69%         1.59%         1.70%            
Debt-to-equity ratio                                                                                                                                                                                   1.5                                          
Early repayment of outstanding borrowings                                                             5 9                                                                   131 209 75 130 7 11 4 8             67 113 64 112 7 11 6 11                 70 123       23 41       12 19     33 57
Aggregate outstanding principal amount     500         253   195           328 422                 269 47                       224                                                     233 470     15 30                 339 589     35 61                                                    
Average outstanding commercial paper                                                                             197 166                                                                                                                                              
Fees paid to maintain credit facility                                                                             0.25%                                                                                                                                                
Applicable margin on LIBOR loans                                                                                                   1.50%     0.50%                                                                                                                    
Short-term borrowings     62 92                                                                                                                                                                                                                      
Accounts payable settlement arrangements     53 56                                                                                                                                                                                                                      
Amount of difference not to exceed the purchase price                                                     750                                                                                                                                                                        
Debt instrument subject to aggregate purchase sublimit   50                                                                                                                                                                                                                          
Remaining outstanding debt of Alcoa               330 322                                       553                                                                                                                                                                    
Interest rate swaps terminated, notional amount   $ 825 $ 550 $ 825         $ 315                                       $ 550