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Share-Based Compensation - Exercise Price - (Details)
shares in Thousands, Option in Thousands
Dec. 31, 2018
CAD ($)
Option
Y
shares
Dec. 31, 2017
CAD ($)
Option
shares
Dec. 31, 2016
CAD ($)
Option
Share based compensation      
Number of share options | Option 28,935 31,110 31,442
Weighted average remaining contractual life | Y 4    
Weighted Average Exercise Price $ 38.25 $ 36.96 $ 35.98
Number of exercisable share option | Option 15,374 17,363  
Weighted Average Exercise Price Exercisable $ 36.10 $ 36.53  
Shares available for future issuance | shares 21,929 28,972  
24.50 to 34.99      
Share based compensation      
Number of share options | Option 7,821    
Weighted average remaining contractual life | Y 3    
Weighted Average Exercise Price $ 30.90    
Number of exercisable share option | Option 5,589    
Weighted Average Exercise Price Exercisable $ 31.16    
35.00 to 39.99      
Share based compensation      
Number of share options | Option 7,214    
Weighted average remaining contractual life | Y 3    
Weighted Average Exercise Price $ 37.74    
Number of exercisable share option | Option 7,195    
Weighted Average Exercise Price Exercisable $ 37.74    
40.00 to 44.99      
Share based compensation      
Number of share options | Option 13,714    
Weighted average remaining contractual life | Y 6    
Weighted Average Exercise Price $ 42.53    
Number of exercisable share option | Option 2,590    
Weighted Average Exercise Price Exercisable $ 42.19    
45.00 to 49.99      
Share based compensation      
Number of share options | Option 58    
Weighted average remaining contractual life | Y 7    
Weighted Average Exercise Price $ 47.82    
50.00 to 54.27      
Share based compensation      
Number of share options | Option 128    
Weighted average remaining contractual life | Y 7    
Weighted Average Exercise Price $ 52.40    
Minimum | 24.50 to 34.99      
Share based compensation      
Exercise price (in dollars per share) 24.50    
Minimum | 35.00 to 39.99      
Share based compensation      
Exercise price (in dollars per share) 35.00    
Minimum | 40.00 to 44.99      
Share based compensation      
Exercise price (in dollars per share) 40.00    
Minimum | 45.00 to 49.99      
Share based compensation      
Exercise price (in dollars per share) 45.00    
Minimum | 50.00 to 54.27      
Share based compensation      
Exercise price (in dollars per share) 50.00    
Maximum | 24.50 to 34.99      
Share based compensation      
Exercise price (in dollars per share) 34.99    
Maximum | 35.00 to 39.99      
Share based compensation      
Exercise price (in dollars per share) 39.99    
Maximum | 40.00 to 44.99      
Share based compensation      
Exercise price (in dollars per share) 44.99    
Maximum | 45.00 to 49.99      
Share based compensation      
Exercise price (in dollars per share) 49.99    
Maximum | 50.00 to 54.27      
Share based compensation      
Exercise price (in dollars per share) $ 54.27