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Stock-Based Compensation (Summary of Activity Related to Employee Restricted Share Units) (Details) - Restricted Share Unit Plan - CAD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Share Unit Plans: Aggregate intrinsic value    
Share Unit Plans: Aggregate intrinsic value $ 32  
Employee    
Share Unit Plans: Units    
Share Unit Plans: Outstanding, Beginning Balance 508,468  
Share Unit Plans: Granted including DRIP 236,537  
Share Unit Plans: Exercised (171,537)  
Share Unit Plans: Forfeited (10,827)  
Share Unit Plans: Outstanding and exercisable, Ending Balance 562,641  
Share Unit Plans: Weighted Average Grant Date Fair Value    
Share Unit Plans: Weighted Average Grant Date Fair Value: Outstanding, Beginning Balance $ 56.25  
Share Unit Plans: Weighted Average Grant Date Fair Value: Granted including DRIP 52.07  
Share Unit Plans: Weighted Average Grant Date Fair Value: Exercised 54.62  
Share Unit Plans: Weighted Average Grant Date Fair Value: Forfeited 54.76  
Share Unit Plans: Weighted Average Grant Date Fair Value: Outstanding and exercisable, Ending Balance $ 55.01  
Share Unit Plans: Aggregate intrinsic value    
Share Unit Plans: Aggregate intrinsic value   $ 30