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Debt and Capital Structure - Additional Information (Detail)
 1 Months Ended 2 Months Ended 12 Months Ended
Feb. 08, 2022
USD ($)
Oct. 31, 2021
CAD ($)
Dec. 31, 2021
CAD ($)
$ / bbl
Jan. 10, 2022
USD ($)
Dec. 31, 2021
USD ($)
Oct. 31, 2021
USD ($)
Oct. 07, 2021
USD ($)
Jan. 01, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Disclosure of detailed information about borrowings [line items]                      
Outstanding letters of credit     $ 565,000,000           $ 441,000,000    
Total debt principal         $ 7,400,000,000         $ 5,900,000,000  
Weighted average interest rate     4.60%   4.60%       4.90% 4.90%  
Maximum debt to capitalization ratio     65.00%   65.00%            
Average crude oil price | $ / bbl     45.00                
Debt offering, maximum amount         $ 4,700,000,000   $ 5,000,000,000        
Short-Term Borrowings     $ 79,000,000           $ 121,000,000    
Rolling Twelve Month Basis                      
Disclosure of detailed information about borrowings [line items]                      
Short-Term Borrowings     79,000,000           121,000,000   $ 0
WRB Refining LP                      
Disclosure of detailed information about borrowings [line items]                      
Committed demand facilities         88,000,000            
Short-Term Borrowings     79,000,000           121,000,000    
Sunrise Oil Sands Partnership                      
Disclosure of detailed information about borrowings [line items]                      
Short-Term Borrowings     $ 0           0    
Minimum                      
Disclosure of detailed information about borrowings [line items]                      
Target Net Debt to Adjusted EBITDA Ratio     1.0                
Target net debt     $ 6,000,000,000                
Maximum                      
Disclosure of detailed information about borrowings [line items]                      
Committed credit facilities, maximum borrowing capacity     1,900,000,000                
Committed demand facilities                 1,600,000,000    
Amount of undrawn facilities for general purposes     $ 1,400,000,000           600,000,000    
Target Net Debt to Adjusted EBITDA Ratio     1.5                
Target net debt     $ 8,000,000,000                
Maximum | WRB Refining LP                      
Disclosure of detailed information about borrowings [line items]                      
Committed demand facilities         300,000,000            
Increase (decrease) in undrawn borrowing facilities $ 150,000,000                    
Maximum | WRB Refining LP | Cenovus Energy Inc                      
Disclosure of detailed information about borrowings [line items]                      
Committed demand facilities         150,000,000            
Increase (decrease) in undrawn borrowing facilities $ 75,000,000                    
Maximum | Sunrise Oil Sands Partnership                      
Disclosure of detailed information about borrowings [line items]                      
Committed demand facilities     10,000,000                
Maximum | Sunrise Oil Sands Partnership | Cenovus Energy Inc                      
Disclosure of detailed information about borrowings [line items]                      
Committed demand facilities     5,000,000                
Cenovus And Husky Merger                      
Disclosure of detailed information about borrowings [line items]                      
Outstanding letters of credit               $ 427,000,000      
Cenovus And Husky Merger | Maximum                      
Disclosure of detailed information about borrowings [line items]                      
Undrawn borrowing facilities               40,000,000      
Unsecured Notes                      
Disclosure of detailed information about borrowings [line items]                      
Total debt principal           $ 2,200,000,000          
Redemption premium   $ 121,000,000                  
Principal amount of debt repayments           $ 2,300,000,000          
Uncommitted Demand Facility                      
Disclosure of detailed information about borrowings [line items]                      
Short-Term Borrowings     0           0    
Uncommitted Demand Facility | Cenovus And Husky Merger | Maximum                      
Disclosure of detailed information about borrowings [line items]                      
Committed credit facilities, maximum borrowing capacity               $ 975,000,000      
Long-Term Debt                      
Disclosure of detailed information about borrowings [line items]                      
Total debt principal     12,113,000,000   7,385,000,000       7,510,000,000 $ 5,898,000,000  
Long-Term Debt | U.S. Dollar Denominated Unsecured Notes                      
Disclosure of detailed information about borrowings [line items]                      
Total debt principal     $ 9,363,000,000   $ 7,385,000,000       7,510,000,000 5,898,000,000  
Borrowings, intent to redeem outstanding balance       $ 384,000,000              
Long-Term Debt | U.S. Dollar Denominated Unsecured Notes | 4.00% due April 15, 2024                      
Disclosure of detailed information about borrowings [line items]                      
Long-term debt, interest rate     4.00% 4.00% 4.00% 4.00%          
Total debt principal     $ 341,000,000   $ 269,000,000       0 0  
Long-Term Debt | U.S. Dollar Denominated Unsecured Notes | 4.40% due April 15, 2029                      
Disclosure of detailed information about borrowings [line items]                      
Long-term debt, interest rate     4.40%   4.40%            
Total debt principal     $ 951,000,000   $ 750,000,000       0 0  
Long-Term Debt | U.S. Dollar Denominated Unsecured Notes | 6.80% due September 15, 2037                      
Disclosure of detailed information about borrowings [line items]                      
Long-term debt, interest rate     6.80%   6.80%            
Total debt principal     $ 490,000,000   $ 387,000,000       $ 0 $ 0