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Commitments (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Future Aggregate Minimum Lease Payments Under Non-cancellable Operating Leases

The future aggregate minimum lease payments under non-cancellable operating leases are as follows:

 

(CAD$ in millions)

    2017      2016  

Less than one year

    $ 93      $ 80  

One to five years

      179        162  

Thereafter

      327        310  
  

 

 

     

 

 

  
   $ 599      $ 552