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Non-Operating Income (Expense) (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Schedule of Non-Operating Income (Expense)

(CAD$ in millions)

    2017      2016  

Foreign exchange gains

    $ 5      $ 46  

Gain on debt prepayment options (Note 28(b))

      51        113  

Gain on sale of investments

      9        34  

Gain (loss) on debt repurchases (Note 18(a) and Note 18(b))

      (216 )       49  

Provision for marketable securities

      —          (3 ) 
  

 

 

     

 

 

  
   $ (151 )     $ 239