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Debt (Schedule Of Long-Term Debt) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Jan. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
6% Notes, Due 2012 [Member]
Dec. 31, 2010
6% Notes, Due 2012 [Member]
Aug. 31, 2010
6% Notes, Due 2012 [Member]
Dec. 31, 2011
5.375% Notes, Due 2013 [Member]
Dec. 31, 2010
5.375% Notes, Due 2013 [Member]
Dec. 31, 2011
6% Notes, Due 2013 [Member]
Dec. 31, 2010
6% Notes, Due 2013 [Member]
Dec. 31, 2011
5.25% Convertible Notes, Due 2014 [Member]
Dec. 31, 2010
5.25% Convertible Notes, Due 2014 [Member]
Dec. 31, 2011
5.55% Notes, Due 2017 [Member]
Dec. 31, 2010
5.55% Notes, Due 2017 [Member]
Dec. 31, 2011
6.5% Bonds, Due 2018 [Member]
Dec. 31, 2010
6.5% Bonds, Due 2018 [Member]
Dec. 31, 2011
6.75% Notes, Due 2018 [Member]
Dec. 31, 2010
6.75% Notes, Due 2018 [Member]
Dec. 31, 2011
5.72% Notes, Due 2019 [Member]
Dec. 31, 2010
5.72% Notes, Due 2019 [Member]
Dec. 31, 2011
6.15% Notes, Due 2020 [Member]
Dec. 31, 2010
6.15% Notes, Due 2020 [Member]
Dec. 31, 2011
5.40% Notes, Due 2021 [Member]
Dec. 31, 2010
5.40% Notes, Due 2021 [Member]
Dec. 31, 2011
5.87% Notes, Due 2022 [Member]
Dec. 31, 2010
5.87% Notes, Due 2022 [Member]
Dec. 31, 2011
5.9% Notes, Due 2027 [Member]
Dec. 31, 2010
5.9% Notes, Due 2027 [Member]
Dec. 31, 2011
6.75% Bonds, Due 2028 [Member]
Dec. 31, 2010
6.75% Bonds, Due 2028 [Member]
Dec. 31, 2011
5.95% Notes Due 2037 [Member]
Dec. 31, 2010
5.95% Notes Due 2037 [Member]
Dec. 31, 2010
BNDES Loans, Due 2012-2029 [Member]
Dec. 31, 2011
BNDES Loans, Due 2012-2029 [Member]
Dec. 31, 2011
Other [Member]
Dec. 31, 2010
Other [Member]
Debt Instrument [Line Items]                                                                        
Long-term debt   $ 9,085 $ 9,073 $ 322 $ 322     $ 553 $ 422 $ 750 $ 575 $ 575 $ 750 $ 750 $ 250 $ 250 $ 750 $ 750 $ 750 $ 750 $ 1,000 $ 1,000 $ 1,250    $ 627 $ 627 $ 625 $ 625 $ 300 $ 300 $ 625 $ 625 $ 899 $ 627 $ 212 [1] $ 297 [1]
Less: amount due within one year   445 231                                                                  
Long-term debt, excluding amount due within one year   $ 8,640 $ 8,842                                                                  
Long-term debt, interest rate 6.00%     6.00%   6.00% 5.375%   6.00%   5.25%   5.55%   6.50%   6.75%   5.72%   6.15%   5.40%   5.87%   5.90%   6.75%   5.95%          
Debt instrument, maturity date       2012     2013   2013   2014   2017   2018   2018   2019   2020   2021   2022   2027   2028   2037          
Debt instrument, maturity date range, start                                                                 2012      
[1] Other includes various financing arrangements related to subsidiaries, unamortized debt discounts related to the outstanding notes and bonds listed in the table above, a beneficial conversion feature related to the convertible notes (see below), and adjustments to the carrying value of long-term debt related to interest swap contracts accounted for as fair value hedges (see the Derivatives section of Note X).