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Common Stock (Narrative) (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Gross proceeds from Issuance of Common Stock $ 284 $ 424
Percentage of outstanding stock maximum 10.00%  
Common Stock    
Debt Instrument [Line Items]    
Issuance of common stock (shares) 5,120,000 8,290,000
ATM Program    
Debt Instrument [Line Items]    
Maximum common stock issued from treasury amount $ 1  
ATM Program | Common Stock    
Debt Instrument [Line Items]    
Remaining available authorized amount for issuance $ 336  
Issuance of common stock (shares) 5,117,273 8,287,037
Gross proceeds from Issuance of Common Stock $ 264 $ 400
Net proceeds from issuance of common stock $ 261 $ 397
Average price per share, issued $ 51.52 $ 48.27
Employee Stock Option Plan    
Debt Instrument [Line Items]    
Common Stock, Capital Shares Reserved for Future Issuance 6,000,000 6,000,000
Share Unit Plans    
Debt Instrument [Line Items]    
Common Stock, Capital Shares Reserved for Future Issuance 2,000,000 2,000,000
Dividend Reinvestment    
Debt Instrument [Line Items]    
Common Stock, Capital Shares Reserved for Future Issuance 12,000,000 18,000,000