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Stock-Based Compensation Plans - Narrative (Detail)
share in Thousands
 9 Months Ended
Sep. 30, 2021
shares
$ / shares
Sep. 30, 2021
$ / shares
Sep. 30, 2021
share
$ / shares
Jan. 01, 2021
shares
Cenovus Replacement Stock Options        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Number of share options per replacement stock option (in shares) | shares       0.7845
Weighted average exercise price (in CAD per share) | $ / shares $ 15.10 $ 15.10 $ 15.10  
Number of shares issued for stock options exercised (in shares) 607,000   2,000  
Weighted average exercise price of shares exercised (in CAD per share) | $ / shares   3.55    
Number of share options exercised and settled for shares (in shares) | shares 3,000      
Number of share options exercised and settled for cash (in shares) | shares 604,000      
Stock Options With Associated Net Settlement Rights        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Weighted average exercise price (in CAD per share) | $ / shares $ 13.07 13.07 $ 13.07  
Number of shares issued for stock options exercised (in shares) | shares 32,000      
Weighted average exercise price of shares exercised (in CAD per share) | $ / shares   $ 9.48