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Description of Business and Segmented Disclosures - Schedule of Geographical Information (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of geographical areas [line items]      
Revenue $ 46,357 $ 13,543 [1] $ 20,542 [1]
Non-Current Assets 40,902 29,631  
Total Current Assets 11,988 2,976  
Canada      
Disclosure of geographical areas [line items]      
Revenue 23,768 8,715 12,160
Non-Current Assets 33,915 26,041  
Canada | Retail | Assets classified as held for sale      
Disclosure of geographical areas [line items]      
Total Current Assets 552    
Canada | Oil Sands | Assets classified as held for sale      
Disclosure of geographical areas [line items]      
Total Current Assets 593    
Canada | Conventional | Assets classified as held for sale      
Disclosure of geographical areas [line items]      
Total Current Assets 159    
United States      
Disclosure of geographical areas [line items]      
Revenue 21,326 4,828 8,382
Non-Current Assets 4,093 3,590  
China      
Disclosure of geographical areas [line items]      
Revenue 1,263 0 $ 0
Non-Current Assets 2,583 0  
Indonesia      
Disclosure of geographical areas [line items]      
Non-Current Assets $ 311 $ 0  
[1] See Note 3(w) for revisions to comparative results.