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Risk Management Activities - Net Risk Management Assets and Liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Financial Liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities $ (171) $ (385)
Commodity risk management | Current risk management liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities 53 (178)
Commodity risk management | Long-term risk management liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities (220) (226)
Commodity risk management | Financial Liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities (167) (404)
Other | Current risk management liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities   15
Other | Long-term risk management liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities   4
Other | Financial Liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities   19
Current | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities (12)  
Long-term | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities 8  
Financial Assets | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities (4)  
Cash flow hedges | Cash flow hedges | Financial Liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities 45 (205)
Cash flow hedges | Cash flow hedges | Commodity risk management | Current risk management liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities 45 (125)
Cash flow hedges | Cash flow hedges | Commodity risk management | Long-term risk management liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities 0 (80)
Cash flow hedges | Cash flow hedges | Commodity risk management | Financial Liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities 45 (205)
Cash flow hedges | Cash flow hedges | Other | Current risk management liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities   0
Cash flow hedges | Cash flow hedges | Other | Long-term risk management liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities   0
Cash flow hedges | Cash flow hedges | Other | Financial Liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities   0
Cash flow hedges | Current | Cash flow hedges | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities 0  
Cash flow hedges | Long-term | Cash flow hedges | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities 0  
Cash flow hedges | Financial Assets | Cash flow hedges | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities 0  
Not designated as a hedge | Financial Liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities (216) (180)
Not designated as a hedge | Commodity risk management | Current risk management liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities 8 (53)
Not designated as a hedge | Commodity risk management | Long-term risk management liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities (220) (146)
Not designated as a hedge | Commodity risk management | Financial Liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities (212) (199)
Not designated as a hedge | Other | Current risk management liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities   15
Not designated as a hedge | Other | Long-term risk management liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities   4
Not designated as a hedge | Other | Financial Liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities   $ 19
Not designated as a hedge | Current | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities (12)  
Not designated as a hedge | Long-term | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities 8  
Not designated as a hedge | Financial Assets | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities $ (4)