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Investments in Associates and Joint Ventures (Tables)
 12 Months Ended
Dec. 31, 2017
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Summary of Investments in Associates and Joint Ventures

(CAD$ in millions)

    NuevaUnión      Other      Total  

At January 1, 2016

    $ 959      $ 58      $ 1,017  

Contributions

      13        8        21  

Changes in foreign exchange rates

      (28 )       (1 )       (29 ) 

Share of income

      2        —          2  

Share of other comprehensive income

      —          1        1  
  

 

 

     

 

 

     

 

 

  

At December 31, 2016

    $ 946      $ 66      $ 1,012  

Contributions

      43        4        47  

Changes in foreign exchange rates

      (64 )       1        (63 ) 

Share of income

      4        2        6  

Share of other comprehensive income

      —          (1 )       (1 ) 

Acquisition of AQM Copper Inc.

      —          (58 )       (58 ) 
  

 

 

     

 

 

     

 

 

  

At December 31, 2017

    $ 929      $ 14      $ 943