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Exploration and Evaluation Assets, Net - Summary of Exploration and Valuation Assets, Net (Detail) - CAD ($)
$ in Millions
 8 Months Ended 12 Months Ended
Aug. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Exploration And Evaluation Assets [Line Items]        
Beginning Balance $ 720 $ 720    
Write-downs   (101) $ (18) [1] $ (91) [1]
Ending Balance   685 720  
Sunrise Oil Sands Partnership        
Disclosure Of Exploration And Evaluation Assets [Line Items]        
Carrying Value Of Investment In Joint Ventures Prior To Acquisition​ Date 0      
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination 40      
Oil Sands        
Disclosure Of Exploration And Evaluation Assets [Line Items]        
Beginning Balance 653 653    
Ending Balance   674 653  
Offshore        
Disclosure Of Exploration And Evaluation Assets [Line Items]        
Beginning Balance 61 61    
Ending Balance   5 61  
E&E Asset        
Disclosure Of Exploration And Evaluation Assets [Line Items]        
Beginning Balance $ 720 720 623  
Acquisitions (Note 5)     45  
Additions   37 55  
Write-downs   (64) (9)  
Change in Decommissioning Liabilities   (12) 6  
Exchange Rate Movements and Other   4    
Ending Balance   685 720 $ 623
E&E Asset | Oil Sands        
Disclosure Of Exploration And Evaluation Assets [Line Items]        
Exploration and evaluation costs previously capitalized, written off   2 $ 9  
E&E Asset | Offshore        
Disclosure Of Exploration And Evaluation Assets [Line Items]        
Exploration and evaluation costs previously capitalized, written off   $ 62    
[1] See Note 3X for revisions to prior period results.