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Inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Inventories
     December 31,
2018		      December 31,
2017		  

(CAD$ in millions)

   

 

      (restated)  

Supplies

    $ 693      $ 563  

Raw materials

      300        223  

Work in process

      595        529  

Finished products

      539        462  
  

 

 

     

 

 

  
     2,127        1,777  

Less long-term portion (Note 14)

      (62 )       (108 ) 
  

 

 

     

 

 

  
   $ 2,065      $ 1,669