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Long-term debt (Details 1) (CAD)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Long Term Debt Maturities [Line Items]    
2012 135 [1]  
2013 512  
2014 537  
2015 81  
2016 826  
2017 and thereafter 4,485  
Total debt 6,576 [2] 6,071 [2]
Capital Leases [Member]
   
Long Term Debt Maturities [Line Items]    
2012 53 [1]  
2013 108  
2014 209  
2015 81  
2016 269  
2017 and thereafter 235  
Total debt 955  
Debt [Member]
   
Long Term Debt Maturities [Line Items]    
2012 82 [1]  
2013 404  
2014 328  
2015 0  
2016 557  
2017 and thereafter 4,250  
Total debt 5,621  
[1] Current portion of long-term debt.
[2] See Note 18 - Financial Instruments, for the fair value of debt.