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Commitments (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [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)

    2018      2017  

Less than one year

    $ 113      $ 93  

One to five years

      162        179  

Thereafter

      164        327  
  

 

 

     

 

 

  
   $ 439      $ 599