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Financial Instruments - Summary of Unrealized Risk Management Positions (Detail) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]      
Net $ 7 $ 12 $ 46
Power Contacts      
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]      
Net 6    
Renewable Power Contracts      
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]      
Net 5    
Level 2      
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]      
Net 2 (6)  
Level 2 | Commodity price risk      
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]      
Asset 20 31  
Liability 13 19  
Net 7 12  
Level 2 | Commodity price risk | Crude Oil, Natural Gas, Condensate and Refined Products      
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]      
Asset 9 11  
Liability 10 19  
Net (1) (8)  
Level 2 | Commodity price risk | Power Contacts      
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]      
Asset 6 2  
Liability 0 0  
Net 6 2  
Level 2 | Commodity price risk | Renewable Power Contracts      
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]      
Asset 5 18  
Liability 0 0  
Net 5 18  
Level 2 | Currency risk | Foreign Exchange Rate Contracts      
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]      
Asset 0 0  
Liability 3 0  
Net $ (3) $ 0