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Common Stock (Narrative) (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Issuance of common stock (shares) 8,290,000 4,070,000.00
Gross proceeds from Issuance of Common Stock $ 424 $ 277
Percentage of outstanding stock maximum 10.00%  
ATM Program    
Debt Instrument [Line Items]    
Maximum common stock issued from treasury amount $ 600  
ATM Program | Common Stock    
Debt Instrument [Line Items]    
Issuance of common stock (shares) 8,287,037 4,072,469
Gross proceeds from Issuance of Common Stock $ 400 $ 250
Net proceeds from issuance of common stock $ 397 $ 248
Average price per share, issued $ 48.27 $ 61.31
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 2,700,000
Dividend Reinvestment    
Debt Instrument [Line Items]    
Common Stock, Capital Shares Reserved for Future Issuance 18,000,000 10,000,000