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Stock-Based Compensation Plans - Narrative (Detail)
 6 Months Ended
Jun. 30, 2022
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Weighted average exercise price of other equity instruments exercised or vested in share-based payment arrangement, settled for common shares (in CAD per share) | $ / shares $ 10.43
Cenovus Replacement Stock Options  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Weighted average exercise price (in CAD per share) | $ / shares $ 12.39
Number of shares issued for stock options exercised (in shares) 4,699,000
Number of share units, vested and exercised/paid out (in shares) 4,605,000
Weighted average exercise price of other equity instruments exercised or vested in share-based payment arrangement (in CAD per share) | $ / shares $ 15.49
Number of other equity instruments exercised or vested in share-based payment arrangement, settled for common shares (in shares) 93,000
Weighted average exercise price of other equity instruments exercised or vested in share-based payment arrangement, settled for common shares (in CAD per share) | $ / shares $ 16.18
Common shares issued in exercise of other equity instruments (in shares) 73,000
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 $ 12.35
Number of shares issued for stock options exercised (in shares) 9,994,000
Number of share units, vested and exercised/paid out (in shares) 9,182,000
Weighted average exercise price of other equity instruments exercised or vested in share-based payment arrangement (in CAD per share) | $ / shares $ 13.05
Number of other equity instruments exercised or vested in share-based payment arrangement, settled for common shares (in shares) 812,000
Common shares issued in exercise of other equity instruments (in shares) 351,000