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Common Stock (Summary of Issued and Outstanding Common Stock) (Details) - CAD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Increase (Decrease) In Common Stock Value [Roll Forward]    
Beginning Balance $ 8,462  
Issuance of common stock 261 $ 397
Senior management stock options exercised and Employee Share Purchase Plan ("ECSPP") 30 32
Ending Balance 9,042 8,462
Common Stock    
Increase (Decrease) In Common Stock Value [Roll Forward]    
Beginning Balance 8,462 7,762
Issuance of common stock 261 397
Issued under Purchase Plans at market rate 291 272
Senior management stock options exercised and Employee Share Purchase Plan ("ECSPP") 28 31
Ending Balance $ 9,042 $ 8,462
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance 284,120 269,950
Issuance of common stock (shares) 5,120 8,290
Issued under Purchase Plans at market rate 6,100 5,260
Options exercised under senior management share option plan 600 620
Ending Balance 295,940 284,120