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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, 2023
Dec. 31, 2022
Increase (Decrease) In Common Stock Value [Roll Forward]    
Beginning Balance $ 7,762  
Issuance of common stock 397 $ 248
Senior management stock options exercised and Employee Share Purchase Plan ("ECSPP") 32 36
Ending Balance $ 8,462 $ 7,762
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance 269,950 261,070
Issuance of common stock (shares) 8,290 4,070
Issued under Purchase Plans at market rate 5,260 4,210
Options exercised under senior management share option plan 620 600
Ending Balance 284,120 269,950
Common Stock    
Increase (Decrease) In Common Stock Value [Roll Forward]    
Beginning Balance $ 7,762 $ 7,242
Issuance of common stock 397 248
Issued under Purchase Plans at market rate 272 238
Senior management stock options exercised and Employee Share Purchase Plan ("ECSPP") 31 34
Ending Balance $ 8,462 $ 7,762