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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Cash Flow Information

(CAD$ in millions)

    December 31,
2017		      December 31,
2016		  

Cash and cash equivalents

      

Cash

    $ 230      $ 254  

Investments with maturities from the date of acquisition of three months or less

      722        1,153  
  

 

 

     

 

 

  
   $ 952      $ 1,407  
  

 

 

     

 

 

  

(CAD$ in millions)

    2017      2016  

Net change in non-cash working capital items

      

Trade accounts receivable

    $ (250 )     $ (480 ) 

Inventories

      (1 )       (86 ) 

Trade accounts payable and other liabilities

      345        206  
  

 

 

     

 

 

  
   $ 94      $ (360 )