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Risk Management Activities - Net Risk Management Assets and Liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Commodity risk management    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   $ 542
Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   (12)
Current | Commodity risk management    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ 45 90
Current | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 2 (13)
Long-term | Commodity risk management    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 248 452
Long-term | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 6 1
Financial Assets    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 301 530
Financial Assets | Commodity risk management    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 293  
Financial Assets | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 8  
Designated as a hedge | Cash flow hedges | Commodity risk management    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   572
Designated as a hedge | Cash flow hedges | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   (9)
Designated as a hedge | Current | Cash flow hedges | Commodity risk management    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 33 101
Designated as a hedge | Current | Cash flow hedges | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 3 (9)
Designated as a hedge | Long-term | Cash flow hedges | Commodity risk management    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 252 471
Designated as a hedge | Long-term | Cash flow hedges | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 0 0
Designated as a hedge | Financial Assets | Cash flow hedges    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 288 563
Designated as a hedge | Financial Assets | Cash flow hedges | Commodity risk management    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 285  
Designated as a hedge | Financial Assets | Cash flow hedges | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 3  
Not designated as a hedge | Financial Liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 13  
Not designated as a hedge | Commodity risk management    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   (30)
Not designated as a hedge | Commodity risk management | Long-term    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (4) (19)
Not designated as a hedge | Commodity risk management | Current    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 12  
Not designated as a hedge | Commodity risk management | Financial Liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 8  
Not designated as a hedge | Other | Long-term    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   1
Not designated as a hedge | Other | Current    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   (4)
Not designated as a hedge | Other | Financial Liabilities    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   (3)
Not designated as a hedge | Current | Commodity risk management    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   (11)
Not designated as a hedge | Current | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (1)  
Not designated as a hedge | Long-term | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 6  
Not designated as a hedge | Financial Assets    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   $ (33)
Not designated as a hedge | Financial Assets | Other    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ 5