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Long-term Debt and Capital Structure - Additional Information (Detail)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jul. 30, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Sep. 19, 2019
USD ($)
Disclosure of detailed information about borrowings [line items]                
Weighted average interest rate 4.90% 4.90%   4.90%   5.10% 5.10%  
Total Debt Principal       $ 5,898,000,000     $ 4,998,000,000  
Committed Credit Facility [Member]                
Disclosure of detailed information about borrowings [line items]                
Maturity date   Cenovus has in place a committed revolving credit facility that consists of a $1.2 billion tranche and a $3.3 billion tranche with maturity dates of November 30, 2022 and November 30, 2023, respectively. In April 2020, the Company added a committed credit facility with capacity of $1.1 billion to further support the Company’s financial resilience in the current market environment. On December 31, 2020, the Company cancelled the $1.1 billion credit facility. Cenovus has in place a committed revolving credit facility that consists of a $1.2 billion tranche and a $3.3 billion tranche with maturity dates of November 30, 2022 and November 30, 2023, respectively. In April 2020, the Company added a committed credit facility with capacity of $1.1 billion to further support the Company’s financial resilience in the current market environment. On December 31, 2020, the Company cancelled the $1.1 billion credit facility.          
Credit facility cancellation $ 1,100              
Top of Range [Member]                
Disclosure of detailed information about borrowings [line items]                
Target Net Debt to Adjusted EBITDA Ratio   2.0 2.0          
Debt to capitalization ratio 65.00% 65.00%   65.00%        
Base Shelf Prospectus [Member] | Top of Range [Member]                
Disclosure of detailed information about borrowings [line items]                
Authorized capacity under base shelf prospectus               $ 5,000,000,000
Tranche One [Member] | Committed Credit Facility [Member]                
Disclosure of detailed information about borrowings [line items]                
Maturity date   November 30, 2022 November 30, 2022          
Tranche One [Member] | Top of Range [Member] | Committed Credit Facility [Member]                
Disclosure of detailed information about borrowings [line items]                
Committed credit facility capacity $ 1,100 $ 1,100       $ 1,200    
Tranche Two [Member] | Committed Credit Facility [Member]                
Disclosure of detailed information about borrowings [line items]                
Maturity date   November 30, 2023 November 30, 2023          
Tranche Two [Member] | Top of Range [Member] | Committed Credit Facility [Member]                
Disclosure of detailed information about borrowings [line items]                
Committed credit facility capacity           $ 3,300    
Senior Unsecured Notes                
Disclosure of detailed information about borrowings [line items]                
Total Debt Principal         $ 1,000,000,000      
Long-term Borrowings [Member]                
Disclosure of detailed information about borrowings [line items]                
Payment to repurchase unsecured notes     $ 81,000,000          
Unsecured notes principal repurchase       $ 100,000,000        
Gain on debt repurchase recorded in finance cost   $ 25