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Stock-Based Compensation (Summary of Stock Option Information) (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Non-Vested Options: Weighted average exercise price per share    
Non-Vested Options: Weighted average exercise price per share, Granted $ 4.66 $ 6.32
Stock option plan, Additional information    
Non-Vested options: Unrecognized compensation $ 6 $ 5
Non-vested options: Weighted average recognition period 3 years 3 years
Vested Options: Weighted average remaining term 4 years 5 years
Vested Options: Aggregate intrinsic value $ 11 $ 8
Vested Options: Fair value $ 2 $ 2
Employee Stock Option Plan    
Total Options, Number of Options    
Total Options: Number of Options, Outstanding, Beginning Balance 3,095,604  
Granted 792,600  
Total Options: Number of Options, Exercised (78,839)  
Total Options: Number of Options, Forfeited (13,325)  
Total Options: Number of Options, Outstanding, Ending Balance 3,796,040 3,095,604
Total Options: Number of Options, Options exercisable 2,188,550  
Total Options, Weighted average exercise price per share    
Total Options: Weighted average exercise price per share, Outstanding, Beginning Balance $ 51.20  
Total Options: Weighted average exercise price per share, Granted 46.97  
Total Options: Weighted average exercise price per share, Exercised 39.86  
Total Options: Weighted average exercise price per share, Forfeited 56.14  
Total Options: Weighted average exercise price per share, Outstanding, Ending Balance 50.53 $ 51.20
Total Options: Weighted average exercise price per share, Options exercisable $ 50.07  
Non-Vested Options, Number of Options    
Non-Vested Options: Number of Options, Outstanding, Beginning Balance 1,253,255  
Granted 792,600  
Non-Vested Options: Number of Options, Vested 438,365  
Non-Vested Options: Number of options, Forfeited 0  
Non-Vested Options: Number of Options, Ending Balance 1,607,490 1,253,255
Non-Vested Options: Weighted average exercise price per share    
Non-Vested Options: Weighted average exercise price per share, Outstanding, Beginning Balance $ 5.17  
Non-Vested Options: Weighted average exercise price per share, Granted 4.66  
Non-Vested Options: Weighted average exercise price per share, Vested 4.58  
Non-Vested Options: Weighted average exercise price per share, Outstanding, Ending Balance $ 5.08 $ 5.17