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Other Long-Term Liabilities - Schedule of Other Long-Term Liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about business combination [line items]        
Asset retirement obligations $ 6,806 $ 5,861 $ 5,771 $ 3,886
Lease liabilities 1,584 1,690    
Share-based compensation 489 160 $ 297 124
Risk management 85 160    
Transportation and processing contracts 241 270    
Other 127 145    
Other liabilities 9,332 8,286    
Less: current portion 948 722    
Other long-term liabilities 8,384 7,564    
Annual installment amount       $ 25
Joslyn Oil Sands        
Disclosure of detailed information about business combination [line items]        
Other $ 48 $ 72