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Income Taxes - Summary of Major Temporary Differences (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities $ 14,299 $ 13,763    
Deferred income tax assets (3,760) (3,580)    
Net deferred income tax liability 10,539 10,183 $ 10,114 $ 10,220
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 12,647 12,172    
Lease assets        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities 316 336    
Investments        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities 0 54    
Investment in North West Redwater Partnership        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities 908 904    
Taxable PRT for corporate income tax        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities 336 256    
Other        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities 92 41    
Asset retirement obligations        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax assets (2,437) (2,098)    
Lease liabilities        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax assets (332) (356)    
Share-based compensation        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax assets (35) (31)    
Loss carryforwards        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax assets (36) (417)    
Unrealized foreign exchange loss on long-term debt        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax assets (125) (39)    
Deferred PRT        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax assets $ (795) $ (639)