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Leases - Additional Information (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
CAD ($)
Dec. 31, 2017
renewalOption
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Disclosure of quantitative information about right-of-use assets [line items]          
Right-of-use assets $ 730     $ 762 $ 784
Lease liabilities 692     672 $ 680
TAK | Subsidiaries          
Disclosure of quantitative information about right-of-use assets [line items]          
Lease liabilities $ 99   $ 7 119  
TAK | Next 18 years, after year 1 | Subsidiaries          
Disclosure of quantitative information about right-of-use assets [line items]          
Lease liabilities     $ 6    
Fort Hills Energy Limited Partnership          
Disclosure of quantitative information about right-of-use assets [line items]          
Lease term   25 years      
Number of renewal options | renewalOption   4      
Renewal term 5 years        
Fort Hills Energy Limited Partnership | Joint operations          
Disclosure of quantitative information about right-of-use assets [line items]          
Lease liabilities $ 199     $ 203