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Financial Instruments (Details 1)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2011
Foreign currency contracts [Member]
USD ($)
Dec. 31, 2010
Foreign currency contracts [Member]
USD ($)
Dec. 31, 2011
Natural gas contracts [Member]
USD ($)
Dec. 31, 2010
Natural gas contracts [Member]
USD ($)
Dec. 31, 2011
Prepaid Expenses [Member]
Foreign currency contracts [Member]
USD ($)
Dec. 31, 2010
Prepaid Expenses [Member]
Foreign currency contracts [Member]
USD ($)
Dec. 31, 2011
Other Assets [Member]
Foreign currency contracts [Member]
USD ($)
Dec. 31, 2010
Other Assets [Member]
Foreign currency contracts [Member]
USD ($)
Dec. 31, 2011
Other Accrued Liabilities [Member]
Foreign currency contracts [Member]
USD ($)
Dec. 31, 2010
Other Accrued Liabilities [Member]
Foreign currency contracts [Member]
USD ($)
Dec. 31, 2011
Other Accrued Liabilities [Member]
Natural gas contracts [Member]
USD ($)
Dec. 31, 2010
Other Accrued Liabilities [Member]
Natural gas contracts [Member]
USD ($)
Dec. 31, 2011
Other Long Term Liabilities [Member]
Foreign currency contracts [Member]
USD ($)
Dec. 31, 2010
Other Long Term Liabilities [Member]
Foreign currency contracts [Member]
USD ($)
Dec. 31, 2011
Other Long Term Liabilities [Member]
Natural gas contracts [Member]
USD ($)
Dec. 31, 2010
Other Long Term Liabilities [Member]
Natural gas contracts [Member]
USD ($)
Dec. 31, 2011
Cash and cash equivalents [Member]
USD ($)
Dec. 31, 2010
Cash and cash equivalents [Member]
USD ($)
Dec. 31, 2011
Investment in ABCP [Member]
USD ($)
Dec. 31, 2011
Investment in ABCP [Member]
CAD
Dec. 31, 2010
Investment in ABCP [Member]
USD ($)
Dec. 31, 2010
Investment in ABCP [Member]
CAD
Held-for-trading                                                
Trading Securities $ 1,407 $ 1,965                                 $ 1,325 $ 1,881 $ 82 84 $ 84 84
Held-to-maturity investments                                                
Severance investments 5 5                                            
Available-for-sale investments                                                
Equity Method Investments 12 19                                            
Loans and receivables                                                
Accounts receivable 4,398 3,543                                            
Long-term receivables included in other assets 176 129                                            
Total 4,574 3,672                                            
Other financial liabilities                                                
Bank indebtedness 162 20                                            
Long-term debt (including portion due within one year) 71 66                                            
Accounts payable 3,961 3,496                                            
Total 4,194 3,582                                            
Derivatives Fair Value [Line Items]                                                
Derivatives designated as effective hedges, measured at fair value, Assets             21 58 15 40                            
Derivatives designated as effective hedges, measured at fair value, Liabilities         (9) (11)         (31) (17) (6) (6) (38) (13) (3) (5)            
Derivatives designated as effective hedges, measured at fair value, Total $ (42) $ 57 $ (33) $ 68