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Share-Based Compensation - Exercise Price - (Details)
shares in Thousands, Option in Thousands
Dec. 31, 2017
CAD
Option
Y
shares
Dec. 31, 2016
CAD
Option
shares
Dec. 31, 2015
CAD
Option
Share based compensation      
Number of share options | Option 31,110 31,442 29,090
Weighted average remaining contractual life | Y 4    
Weighted Average exercise price CAD 36.96 CAD 35.98 CAD 36.97
Number of exercisable share option | Option 17,363 17,821  
Weighted Average exercise price Exercisable CAD 36.53 CAD 37.74  
Shares available for future issuance | shares 28,972 10,937  
24.50 to 34.99      
Share based compensation      
Number of share options | Option 11,466    
Weighted average remaining contractual life | Y 4    
Weighted Average exercise price CAD 31.32    
Number of exercisable share option | Option 6,714    
Weighted Average exercise price Exercisable CAD 32.07    
35.00 to 39.99      
Share based compensation      
Number of share options | Option 9,987    
Weighted average remaining contractual life | Y 4    
Weighted Average exercise price CAD 37.72    
Number of exercisable share option | Option 8,006    
Weighted Average exercise price Exercisable CAD 37.44    
40.00 to 44.99      
Share based compensation      
Number of share options | Option 8,347    
Weighted average remaining contractual life | Y 5    
Weighted Average exercise price CAD 41.99    
Number of exercisable share option | Option 1,333    
Weighted Average exercise price Exercisable CAD 41.70    
45.00 to 49.99      
Share based compensation      
Number of share options | Option 1,197    
Weighted Average exercise price CAD 47.52    
Number of exercisable share option | Option 1,197    
Weighted Average exercise price Exercisable CAD 47.52    
50.00 to 69.97      
Share based compensation      
Number of share options | Option 113    
Weighted Average exercise price CAD 59.54    
Number of exercisable share option | Option 113    
Weighted Average exercise price Exercisable CAD 59.54    
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 69.97      
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 69.97      
Share based compensation      
Exercise price (in dollars per share) CAD 69.97