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Other Long-Term Liabilities - Schedule of Other Long-Term Liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Oct. 06, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about business combination [line items]          
Asset retirement obligations $ 5,861   $ 5,771 $ 3,886 $ 4,327
Lease liabilities 1,690   1,809    
Share-based compensation 160   297 124 $ 414
Risk management 160   112    
Deferred purchase consideration 72   95 $ 118  
Other 343   98    
Other liabilities 8,286   8,182    
Less: current portion 722   819    
Other long-term liabilities 7,564   $ 7,363    
Annual installment amount $ 25        
Installment period 3 years        
Painted Pony Energy Ltd          
Disclosure of detailed information about business combination [line items]          
Lease liabilities   $ 93      
Product transportation and processing obligation $ 268