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Debt and Capital Structure - Additional Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
CAD ($)
$ / bbl
Dec. 31, 2022
USD ($)
Nov. 10, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Oct. 07, 2021
USD ($)
Sep. 13, 2021
USD ($)
Aug. 18, 2021
CAD ($)
Jan. 01, 2021
CAD ($)
Jan. 01, 2021
USD ($)
Disclosure of detailed information about borrowings [line items]                    
Outstanding letters of credit $ 490     $ 565            
Weighted average interest rate 4.70% 4.70%   4.60% 4.60%          
Total Debt $ 8,691     $ 12,385            
Maximum debt to capitalization ratio 65.00% 65.00%                
Target Net Debt to Adjusted EBITDA Ratio 1.0                  
Average crude oil price | $ / bbl 45.00                  
Target net debt $ 4,000                  
Debt offering, maximum amount   $ 4,700       $ 5,000        
Uncommitted Demand Facilities                    
Disclosure of detailed information about borrowings [line items]                    
Committed demand facilities 1,400                  
Uncommitted Demand Facilities | Top of range                    
Disclosure of detailed information about borrowings [line items]                    
Amount of undrawn facilities for general purposes 1,000                  
WRB Refining LP                    
Disclosure of detailed information about borrowings [line items]                    
Committed demand facilities 190 140                
Undrawn borrowing facilities   170     $ 125          
WRB Refining LP | Cenovus Energy Inc                    
Disclosure of detailed information about borrowings [line items]                    
Undrawn borrowing facilities 115 85   79 63          
Maximum                    
Disclosure of detailed information about borrowings [line items]                    
Committed credit facilities, maximum borrowing capacity 1,900                  
Maximum | Top of range                    
Disclosure of detailed information about borrowings [line items]                    
Amount of undrawn facilities for general purposes 1,400                  
Maximum | WRB Refining LP                    
Disclosure of detailed information about borrowings [line items]                    
Committed credit facilities, maximum borrowing capacity   450     300          
Maximum | WRB Refining LP | Cenovus Energy Inc                    
Disclosure of detailed information about borrowings [line items]                    
Committed credit facilities, maximum borrowing capacity   $ 225     $ 150          
Maximum | Sunrise Oil Sands Partnership                    
Disclosure of detailed information about borrowings [line items]                    
Committed credit facilities, maximum borrowing capacity       10            
Maximum | Sunrise Oil Sands Partnership | Cenovus Energy Inc                    
Disclosure of detailed information about borrowings [line items]                    
Committed credit facilities, maximum borrowing capacity       5            
Committed Credit Facility                    
Disclosure of detailed information about borrowings [line items]                    
Committed credit facilities, maximum borrowing capacity     $ 5,500         $ 6,000    
Undrawn borrowing facilities 0     $ 0            
Decrease in capacity of committed credit facility     $ 500              
Committed credit facilities, cancelled               $ 8,500    
Committed Credit Facility | The Arrangement                    
Disclosure of detailed information about borrowings [line items]                    
Committed credit facilities, maximum borrowing capacity                 $ 4,000  
Total Debt                 350  
Committed Credit Facilities, Maturing August 18, 2024                    
Disclosure of detailed information about borrowings [line items]                    
Committed credit facilities, maximum borrowing capacity 1,800                  
Committed Credit Facilities, Maturing August 18, 2025                    
Disclosure of detailed information about borrowings [line items]                    
Committed credit facilities, maximum borrowing capacity $ 3,700                  
Senior unsecured notes, 2.65%, maturing January 15, 2032                    
Disclosure of detailed information about borrowings [line items]                    
Total Debt             $ 500      
Senior unsecured notes, 3.75%, maturing February 15, 2052                    
Disclosure of detailed information about borrowings [line items]                    
Total Debt             750      
Senior Unsecured Notes                    
Disclosure of detailed information about borrowings [line items]                    
Total Debt             $ 1,250      
Canadian Dollar Denominated Unsecured Notes | The Arrangement                    
Disclosure of detailed information about borrowings [line items]                    
Total Debt                 2,800  
Long-term debt, fair value                 2,900  
U.S. Dollar Denominated Unsecured Notes | The Arrangement                    
Disclosure of detailed information about borrowings [line items]                    
Total Debt                 3,000 $ 2,400
Long-term debt, fair value                 $ 3,400