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Debt and Capital Structure - Additional Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
CAD ($)
$ / bbl
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
USD ($)
Disclosure of detailed information about borrowings [line items]        
Weighted average interest rate 4.50% 4.50% 4.70% 4.70%
Outstanding letters of credit $ 355   $ 364  
Short-Term Borrowings $ 173   179  
Proportion of ownership interest in joint operation 100.00%      
Maximum debt to capitalization ratio 65.00% 65.00%    
Target net debt to adjusted EBITDA ratio 1.0      
Target net debt $ 4,000      
Average crude oil price | $ / bbl 45.00      
WRB Refining LP        
Disclosure of detailed information about borrowings [line items]        
Short-Term Borrowings $ 173   179  
Proportion of ownership interest in joint operation 50.00%      
Undrawn borrowing facilities   $ 240    
WRB Refining LP | Cenovus Energy Inc        
Disclosure of detailed information about borrowings [line items]        
Undrawn borrowing facilities $ 173 120 179 $ 135
Uncommitted Demand Facilities        
Disclosure of detailed information about borrowings [line items]        
Short-Term Borrowings 0   0  
Committed Credit Facilities, Maturing August 18, 2025        
Disclosure of detailed information about borrowings [line items]        
Committed credit facilities, maximum borrowing capacity 2,200      
Committed Credit Facilities, Maturing August 18, 2026        
Disclosure of detailed information about borrowings [line items]        
Committed credit facilities, maximum borrowing capacity 3,300      
Committed Credit Facility        
Disclosure of detailed information about borrowings [line items]        
Undrawn borrowing facilities 0   0  
U.S. Dollar Denominated Unsecured Notes | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total debt principal       1,000
Maximum        
Disclosure of detailed information about borrowings [line items]        
Committed credit facilities, maximum borrowing capacity 1,700   $ 1,700  
Maximum | WRB Refining LP        
Disclosure of detailed information about borrowings [line items]        
Committed credit facilities, maximum borrowing capacity   $ 450   $ 450
Maximum | Top of range        
Disclosure of detailed information about borrowings [line items]        
Amount of undrawn facilities for general purposes $ 1,400