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Stock-Based Compensation (Summary of Stock Option Information) (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Total Options, Number of Options    
Total Options: Number of Options, Exercised (620,000) (600,000)
Non-Vested Options: Weighted average exercise price per share    
Non-Vested Options: Weighted average exercise price per share, Granted $ 6.32 $ 5.35
Stock option plan, Additional information    
Non-Vested options: Unrecognized compensation $ 5 $ 4
Non-vested options: Weighted average recognition period 3 years 3 years
Vested Options: Weighted average remaining term 5 years 5 years
Vested Options: Aggregate intrinsic value $ 8 $ 10
Vested Options: Fair value $ 2 $ 2
Employee Stock Option Plan    
Total Options, Number of Options    
Total Options: Number of Options, Outstanding, Beginning Balance 2,853,879  
Granted 483,100  
Total Options: Number of Options, Exercised (146,475)  
Total Options: Number of Options, Forfeited (94,900)  
Total Options: Number of Options, Outstanding, Ending Balance 3,095,604 2,853,879
Total Options: Number of Options, Options exercisable 1,842,349  
Total Options, Weighted average exercise price per share    
Total Options: Weighted average exercise price per share, Outstanding, Beginning Balance $ 50.41  
Total Options: Weighted average exercise price per share, Granted 54.64  
Total Options: Weighted average exercise price per share, Exercised 43.94  
Total Options: Weighted average exercise price per share, Forfeited 56.32  
Total Options: Weighted average exercise price per share, Outstanding, Ending Balance 51.20 $ 50.41
Total Options: Weighted average exercise price per share, Options exercisable $ 48.39  
Non-Vested Options, Number of Options    
Non-Vested Options: Number of Options, Outstanding, Beginning Balance 1,348,400  
Granted 483,100  
Non-Vested Options: Number of Options, Vested 526,620  
Non-Vested Options: Number of options, Forfeited (51,625)  
Non-Vested Options: Number of Options, Ending Balance 1,253,255 1,348,400
Non-Vested Options: Weighted average exercise price per share    
Non-Vested Options: Weighted average exercise price per share, Outstanding, Beginning Balance $ 4.08  
Non-Vested Options: Weighted average exercise price per share, Granted 6.32  
Non-Vested Options: Weighted average exercise price per share, Vested 3.58  
Non-Vested Options: Weighted average exercise price per share, Forfeited 3.61  
Non-Vested Options: Weighted average exercise price per share, Outstanding, Ending Balance $ 5.17 $ 4.08