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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Inventories

(CAD$ in millions)

    December 31,
2017		      December 31,
2016		  

Supplies

    $ 563      $ 586  

Raw materials

      223        204  

Work in-process

      529        521  

Finished products

      430        449  
  

 

 

     

 

 

  
     1,745        1,760  

Less long-term portion (Note 13)

      (108 )       (87 ) 
  

 

 

     

 

 

  
   $ 1,637      $ 1,673