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Risk Management Activities - Net Risk Management Assets and Liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Financial Liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities $ (385) $ (592)
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 (178) (414)
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 (226) (172)
Commodity risk management | Financial Liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities (404) (586)
Other | Current risk management liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities   (6)
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
Other | Financial Liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities   (6)
Current | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities 15  
Long-term | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities 4  
Financial Assets | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities 19  
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 (205) (347)
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 (125) (271)
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 (80) (76)
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 (205) (347)
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 (180) (245)
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 (53) (143)
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 (146) (96)
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 (199) (239)
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   (6)
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   0
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   $ (6)
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 15  
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 4  
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 $ 19