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Stock-based Compensatin (Stock Options) (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Total Options, Number of Options    
Total Options: Number of Options, Exercised (600,000) (750,000)
Non-Vested Options: Weighted average exercise price per share    
Non-Vested Options: Weighted average exercise price per share, Granted $ 5.35 $ 3.63
Stock option plan, Additional information    
Non-Vested options: Unrecognized compensation $ 4 $ 3
Non-vested options: Weighted average recognition period 3 years 3 years
Vested Options: Weighted average remaining term 5 years 6 years
Vested Options: Aggregate intrinsic value $ 10 $ 21
Vested Options: Fair value $ 2 $ 1
Employee Stock Option Plan    
Total Options, Number of Options    
Total Options: Number of Options, Outstanding, Beginning Balance 2,590,304  
Granted 467,100  
Total Options: Number of Options, Exercised (203,525)  
Total Options: Number of Options, Outstanding, Ending Balance 2,853,879 2,590,304
Total Options: Number of Options, Options exercisable 1,505,479  
Total Options, Weighted average exercise price per share    
Total Options: Weighted average exercise price per share, Outstanding, Beginning Balance $ 48.48  
Total Options: Weighted average exercise price per share, Granted 58.26  
Total Options: Weighted average exercise price per share, Exercised 43.87  
Total Options: Weighted average exercise price per share, Outstanding, Ending Balance 50.41 $ 48.48
Total Options: Weighted average exercise price per share, Options exercisable $ 46.59  
Non-Vested Options, Number of Options    
Non-Vested Options: Number of Options, Outstanding, Beginning Balance 1,452,475  
Granted 467,100  
Non-Vested Options: Number of Options, Vested 571,175  
Non-Vested Options: Number of Options, Ending Balance 1,348,400 1,452,475
Non-Vested Options: Weighted average exercise price per share    
Non-Vested Options: Weighted average exercise price per share, Outstanding, Beginning Balance $ 3.18  
Non-Vested Options: Weighted average exercise price per share, Granted 5.35  
Non-Vested Options: Weighted average exercise price per share, Vested 2.83  
Non-Vested Options: Weighted average exercise price per share, Outstanding, Ending Balance $ 4.08 $ 3.18