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Income Taxes - Summary of Major Temporary Differences (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities $ 13,481 $ 13,592    
Deferred income tax assets (3,367) (3,372)    
Net deferred income tax liability 10,114 10,220 $ 10,144 $ 10,539
Property, plant and equipment and exploration and evaluation assets        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities 11,985 12,254    
Lease assets        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities 336 349    
Investments        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities 56 35    
Investment in North West Redwater Partnership        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities 903 850    
Unrealized risk management activities        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities 0 12    
Unrealized foreign exchange on long-term debt        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities 0 14    
Deferred income tax assets (67) 0    
Asset retirement obligations        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax assets (1,822) (1,719)    
Lease liabilities        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax assets (354) (363)    
Share-based compensation        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax assets (33) (22)    
Loss carryforwards        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax assets (652) (1,268)    
Deferred PRT        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax assets (439) 0    
Taxable PRT for corporate income tax        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities 176 0    
Other        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities $ 25 $ 78