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Risk Management Activities - Net Risk Management Assets and Liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Financial Liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities $ (592)  
Commodity risk management    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities   $ 293
Commodity risk management | Financial Liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities (586)  
Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities   8
Other | Financial Liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities (6)  
Current | Commodity risk management    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities (414) 45
Current | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities (6) 2
Long-term | Commodity risk management    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities (172) 248
Long-term | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities 0 6
Financial Assets    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities   301
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 (347)  
Cash flow hedges | Cash flow hedges | Commodity risk management    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities   285
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 (347)  
Cash flow hedges | Cash flow hedges | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities   3
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 | Commodity risk management    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities (271) 33
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 3
Cash flow hedges | Long-term | Cash flow hedges | Commodity risk management    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities (76) 252
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 0
Cash flow hedges | Financial Assets | Cash flow hedges    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities   288
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 (245)  
Not designated as a hedge | Commodity risk management    
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 | 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 (96) (4)
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 (143)  
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 (239)  
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   6
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   (1)
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) 5
Not designated as a hedge | Current | Commodity risk management    
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 | Current | Other    
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 | Long-term | 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 Assets    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commodity risk management assets and liabilities   $ 13