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Stock-Based Compensation Plans - Additional Information (Detail)
$ / shares in Units, shares in Thousands
 12 Months Ended
Dec. 31, 2024
CAD ($)
shares
plan
$ / shares
Dec. 31, 2023
CAD ($)
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Employee Long-Term Incentives | $ $ 132,000,000 $ 284,000,000
Number of deferred share unit plans | plan 2  
Minimum    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Vesting multiplier, percent 0.00%  
Maximum    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Vesting multiplier, percent 200.00%  
Net settlement rights    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Weighted average unit fair value of granted | $ $ 5.20  
Weighted average exercise price, exercised (in dollars per share) | $ / shares $ 10.77  
Weighted average exercise price, exercised (in CAD per share) | $ / shares $ 11.97  
Number of other equity instruments exercised or vested in share-based payment arrangement, settled for common shares (in shares) | shares 793  
Common shares issued in exercise of other equity instruments (in shares) | shares 562  
Outstanding number (in shares) | shares 8,653 11,895
Weighted average remaining contractual life of outstanding share options (in years) 4 years 21 days  
Weighted average exercise price of share options outstanding in share-based payment arrangement (in dollars per share) | $ / shares $ 17.83 $ 13.66
Cenovus Replacement Stock Options    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Employee Long-Term Incentives | $ $ 5,000,000 $ 12,000,000
Outstanding number (in shares) | shares 348 1,005
Weighted average exercise price of share options outstanding in share-based payment arrangement (in dollars per share) | $ / shares $ 3.54 $ 6.49
Cenovus Replacement Stock Options | 3.00 to 4.99    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Outstanding number (in shares) | shares 348  
Weighted average remaining contractual life of outstanding share options (in years) 5 months 19 days  
Weighted average exercise price of share options outstanding in share-based payment arrangement (in dollars per share) | $ / shares $ 3.54  
Cenovus Replacement Stock Options | Settled for cash    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Weighted average exercise price, exercised (in dollars per share) | $ / shares $ 7.34  
Number of other equity instruments exercised or vested in share-based payment arrangement, settled for cash | shares 577  
Weighted average exercise price, exercised (in CAD per share) | $ / shares $ 7.48  
Cenovus Replacement Stock Options | Settled for common shares    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Number of other equity instruments exercised or vested in share-based payment arrangement, settled for common shares (in shares) | shares 37  
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 $ 5.17  
Common shares issued in exercise of other equity instruments (in shares) | shares 29  
PSUs    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Employee Long-Term Incentives | $ $ 80,000,000 $ 238,000,000
Award vesting term 3 years  
Intrinsic value of vested | $ $ 0  
RSUs    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Employee Long-Term Incentives | $ $ 105,000,000 97,000,000
Award vesting term 3 years  
Intrinsic value of vested | $ $ 0  
DSUs Option One    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Percentage of annual bonus award to convert into DSUs 0.00%  
DSUs Option Two    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Percentage of annual bonus award to convert into DSUs 25.00%  
DSUs Option Three    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Percentage of annual bonus award to convert into DSUs 50.00%  
DSUs Option Four    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Percentage of annual bonus award to convert into DSUs 75.00%  
Deferred Share Units Option Five    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Percentage of annual bonus award to convert into DSUs 100.00%  
DSUs    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Employee Long-Term Incentives | $ $ 38,000,000 $ 37,000,000
Deferred Income Tax Assets to be Settled After More Than Twelve Months    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Percentage of options exercisable 30.00%  
Term of share options in sharebased payment arrangement 1 year  
3 Years    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Percentage of options exercisable 30.00%  
Term of share options in sharebased payment arrangement 2 years  
4 Years    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Term of share options in sharebased payment arrangement 3 years  
Later than seven years and not later than ten years    
Disclosure of terms and conditions of share-based payment arrangement [Line Items]    
Term of share options in sharebased payment arrangement 7 years