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Financial Instruments - Schedule of Company's Financial Assets and Liabilities (Detail)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2012
Foreign Exchange Contract [Member]
USD ($)
Dec. 31, 2011
Foreign Exchange Contract [Member]
USD ($)
Dec. 31, 2012
Commodity Contract [Member]
USD ($)
Dec. 31, 2011
Commodity Contract [Member]
USD ($)
Dec. 31, 2012
Prepaid Expenses [Member]
Foreign Exchange Contract [Member]
USD ($)
Dec. 31, 2011
Prepaid Expenses [Member]
Foreign Exchange Contract [Member]
USD ($)
Dec. 31, 2012
Prepaid Expenses [Member]
Commodity Contract [Member]
USD ($)
Dec. 31, 2012
Other Assets [Member]
Foreign Exchange Contract [Member]
USD ($)
Dec. 31, 2011
Other Assets [Member]
Foreign Exchange Contract [Member]
USD ($)
Dec. 31, 2012
Other Accrued Liabilities [Member]
Foreign Exchange Contract [Member]
USD ($)
Dec. 31, 2011
Other Accrued Liabilities [Member]
Foreign Exchange Contract [Member]
USD ($)
Dec. 31, 2012
Other Accrued Liabilities [Member]
Commodity Contract [Member]
USD ($)
Dec. 31, 2011
Other Accrued Liabilities [Member]
Commodity Contract [Member]
USD ($)
Dec. 31, 2012
Other Long Term Liabilities [Member]
Foreign Exchange Contract [Member]
USD ($)
Dec. 31, 2011
Other Long Term Liabilities [Member]
Foreign Exchange Contract [Member]
USD ($)
Dec. 31, 2012
Other Long Term Liabilities [Member]
Commodity Contract [Member]
USD ($)
Dec. 31, 2011
Other Long Term Liabilities [Member]
Commodity Contract [Member]
USD ($)
Dec. 31, 2012
Cash and Cash Equivalents [Member]
USD ($)
Dec. 31, 2011
Cash and Cash Equivalents [Member]
USD ($)
Dec. 31, 2012
Asset-backed Securities [Member]
USD ($)
Dec. 31, 2012
Asset-backed Securities [Member]
CAD
Dec. 31, 2011
Asset-backed Securities [Member]
USD ($)
Dec. 31, 2011
Asset-backed Securities [Member]
CAD
Held-for-trading                                                  
Trading securities $ 1,612 $ 1,407                                   $ 1,522 $ 1,325 $ 90 90 $ 82 84
Held-to-maturity investments                                                  
Severance investments 8 5                                              
Available-for-sale investments                                                  
Equity investments 9 12                                              
Loans and receivables                                                  
Accounts receivable 4,774 4,398                                              
Long-term receivables included in other assets [note 12] 95 176                                              
Total 4,869 4,574                                              
Other financial liabilities                                                  
Bank indebtedness 71 36                                              
Long-term debt (including portion due within one year) 361 197                                              
Accounts payable 4,450 3,961                                              
Total 4,882 4,194                                              
Derivatives designated as effective hedges, measured at fair value, Assets             37 21   32 15                            
Derivatives designated as effective hedges, measured at fair value, Total 47 (42) 49 (33)                                          
Derivatives designated as effective hedges, measured at fair value, Liabilities         $ (2) $ (9)     $ 2     $ (11) $ (31) $ (3) $ (6) $ (9) $ (38) $ (1) $ (3)