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Risk Management Activities - Net Risk Management Assets and Liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Financial Assets    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ 696 $ 677
Not designated as a hedge | Financial Liabilities    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 20  
Not designated as a hedge | Financial Assets    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   (10)
Commodity risk management    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   679
Commodity risk management | Financial Assets    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 692  
Commodity risk management | Current    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 85 59
Commodity risk management | Long-term    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 607 620
Commodity risk management | Not designated as a hedge    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   (8)
Commodity risk management | Not designated as a hedge | Financial Liabilities    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 16  
Commodity risk management | Not designated as a hedge | Current    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 15  
Commodity risk management | Not designated as a hedge | Long-term    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 1 (8)
Commodity risk management | Not designated as a hedge | Current    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   0
Other    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   (2)
Other | Financial Assets    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 4  
Other | Current    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 0 (3)
Other | Long-term    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 4 1
Other | Not designated as a hedge | Financial Liabilities    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   (2)
Other | Not designated as a hedge | Current    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   (3)
Other | Not designated as a hedge | Long-term    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   1
Other | Not designated as a hedge | Financial Assets    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 4  
Other | Not designated as a hedge | Current    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 0  
Other | Not designated as a hedge | Long-term    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 4  
Cash flow hedges | Designated as a hedge | Financial Assets    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 676 687
Cash flow hedges | Commodity risk management | Designated as a hedge    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   687
Cash flow hedges | Commodity risk management | Designated as a hedge | Financial Assets    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 676  
Cash flow hedges | Commodity risk management | Designated as a hedge | Current    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 70 59
Cash flow hedges | Commodity risk management | Designated as a hedge | Long-term    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 606 628
Cash flow hedges | Other | Designated as a hedge    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   0
Cash flow hedges | Other | Designated as a hedge | Financial Assets    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 0  
Cash flow hedges | Other | Designated as a hedge | Current    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 0 0
Cash flow hedges | Other | Designated as a hedge | Long-term    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ 0 $ 0