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Stock-based Compensatin (Stock Options) (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Total Options, Number of Options    
Total Options: Number of Options, Exercised (420,000) (2,570,000)
Non-Vested Options: Weighted average exercise price per share    
Non-Vested Options: Weighted average exercise price per share, Granted $ 3.58 $ 2.41
Stock option plan, Additional information    
Non-Vested options: Unrecognized compensation $ 2 $ 2
Non-vested options: Weighted average recognition period 3 years 2 years
Vested Options: Weighted average remaining term 6 years 6 years
Vested Options: Aggregate intrinsic value $ 12 $ 11
Vested Options: Fair value $ 2 $ 2
Employee Stock Option Plan    
Total Options, Number of Options    
Total Options: Number of Options, Outstanding, Beginning Balance 2,286,550  
Granted 501,900  
Total Options: Number of Options, Exercised (417,968)  
Total Options: Number of Options, Forfeited (102,700)  
Total Options: Number of Options, Outstanding, Ending Balance 2,267,782 2,286,550
Total Options: Number of Options, Options exercisable 973,932  
Total Options, Weighted average exercise price per share    
Total Options: Weighted average exercise price per share, Outstanding, Beginning Balance $ 43.31  
Total Options: Weighted average exercise price per share, Granted 60.03  
Total Options: Weighted average exercise price per share, Exercised 44.74  
Total Options: Weighted average exercise price per share, Forfeited 45.94  
Total Options: Weighted average exercise price per share, Outstanding, Ending Balance 46.62 $ 43.31
Total Options: Weighted average exercise price per share, Options exercisable $ 42.08  
Non-Vested Options, Number of Options    
Non-Vested Options: Number of Options, Outstanding, Beginning Balance 1,549,025  
Granted 501,900  
Non-Vested Options: Number of Options, Vested 654,375  
Non-Vested Options: Number of options, Forfeited (102,700)  
Non-Vested Options: Number of Options, Ending Balance 1,293,850 1,549,025
Non-Vested Options: Weighted average exercise price per share    
Non-Vested Options: Weighted average exercise price per share, Outstanding, Beginning Balance $ 2.22  
Non-Vested Options: Weighted average exercise price per share, Granted 3.58  
Non-Vested Options: Weighted average exercise price per share, Vested 2.32  
Non-Vested Options: Weighted average exercise price per share, Forteited 2.33  
Non-Vested Options: Weighted average exercise price per share, Outstanding, Ending Balance $ 2.69 $ 2.22