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Description of Business and Segmented Disclosures - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2024
CAD ($)
plant
u_cve_customer
Dec. 31, 2023
CAD ($)
u_cve_customer
Disclosure of operating segments [line items]    
Number of ethanol plants | plant 2  
Number of major customers | u_cve_customer 2 2
Gross Sales $ 57,726 $ 55,474
Downstream    
Disclosure of operating segments [line items]    
Gross Sales 33,618 32,626
Downstream | Canadian Refining    
Disclosure of operating segments [line items]    
Gross Sales 5,310 6,233
Customer One    
Disclosure of operating segments [line items]    
Gross Sales 17,700 18,000
Customer Two    
Disclosure of operating segments [line items]    
Gross Sales $ 8,100 $ 7,100
Bottom of range    
Disclosure of operating segments [line items]    
Percentage of entity's revenues from gross sales 10.00%