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Stock-based Compensatin (Stock Options) (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Total Options, Number of Options    
Total Options: Number of Options, Exercised (2,570,000) (20,000)
Non-Vested Options: Weighted average exercise price per share    
Non-Vested Options: Weighted average exercise price per share, Granted $ 2.41 $ 1.7
Stock option plan, Additional information    
Non-Vested options: Unrecognized compensation $ 2 $ 2
Non-vested options: Weighted average recognition period 2 years 4 months 24 days 2 years 2 months 12 days
Vested Options: Weighted average remaining term 5 years 6 months 5 years 1 month 6 days
Vested Options: Aggregate intrinsic value $ 11 $ 18
Vested Options: Fair value $ 2 $ 2
Employee Stock Option Plan    
Total Options, Number of Options    
Total Options: Number of Options, Outstanding, Beginning Balance 4,225,575  
Granted 651,400  
Total Options: Number of Options, Exercised (2,568,625)  
Total Options: Number of Options, Forfeited (21,800)  
Total Options: Number of Options, Outstanding, Ending Balance 2,286,550 4,225,575
Total Options: Number of Options, Options exercisable 737,525  
Total Options, Weighted average exercise price per share    
Total Options: Weighted average exercise price per share, Outstanding, Beginning Balance $ 39.56  
Total Options: Weighted average exercise price per share, Granted 46.39  
Total Options: Weighted average exercise price per share, Exercised 37.9  
Total Options: Weighted average exercise price per share, Forfeited 46.39  
Total Options: Weighted average exercise price per share, Outstanding, Ending Balance 43.31 $ 39.56
Total Options: Weighted average exercise price per share, Options exercisable $ 41.43  
Non-Vested Options, Number of Options    
Non-Vested Options: Number of Options, Outstanding, Beginning Balance 1,679,325  
Granted 651,400  
Non-Vested Options: Number of Options, Vested 759,900  
Non-Vested Options: Number of options, Forfeited (21,800)  
Non-Vested Options: Number of Options, Ending Balance 1,549,025 1,679,325
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 2.41  
Non-Vested Options: Weighted average exercise price per share, Vested 2.37  
Non-Vested Options: Weighted average exercise price per share, Forteited 2.41  
Non-Vested Options: Weighted average exercise price per share, Outstanding, Ending Balance $ 2.22 $ 2.22