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Contingent Payment - Additional Information (Detail)
 12 Months Ended
May 17, 2017
CAD ($)
$ / bbl
Dec. 31, 2020
CAD ($)
$ / bbl
Dec. 31, 2019
CAD ($)
Disclosure Of Contingent Liabilities In Business Combination [Line Items]      
Contingent payable     $ 153,000,000
ConocoPhillips [Member]      
Disclosure Of Contingent Liabilities In Business Combination [Line Items]      
Contingent payment description   In connection with the acquisition (the “Acquisition in 2017”) from ConocoPhillips Company and certain of its subsidiaries (collectively, “ConocoPhillips”), Cenovus agreed to make quarterly payments to ConocoPhillips during the five years subsequent to May 17, 2017 for quarters in which the average WCS crude oil price exceeds $52.00 per barrel during the quarter. The quarterly payment will be $6 million for each dollar that the WCS price exceeds $52.00 per barrel. The calculation includes an adjustment mechanism related to certain significant production outages at Foster Creek and Christina Lake, which may reduce the amount of a contingent payment. There are no maximum payment terms.  
Contingent payments period   5 years  
Average crude oil price per barrel for contingent payment | $ / bbl   52.00  
Quarterly contingent payment $ 6,000,000    
Contingent payable   $ 0 $ 14,000,000
ConocoPhillips [Member] | Top of Range [Member]      
Disclosure Of Contingent Liabilities In Business Combination [Line Items]      
Average crude oil price per barrel for contingent payment | $ / bbl 52.00