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Income Taxes - Summary of Major Temporary Differences (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities $ 13,763 $ 13,481    
Deferred income tax assets (3,580) (3,367)    
Net deferred income tax liability 10,183 10,114 $ 10,220 $ 10,144
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 12,172 11,985    
Lease assets        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities 336 336    
Investments        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities 54 56    
Investment in North West Redwater Partnership        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities 904 903    
Taxable PRT for corporate income tax        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities 256 176    
Other        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax liabilities 41 25    
Asset retirement obligations        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax assets (2,098) (1,822)    
Lease liabilities        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax assets (356) (354)    
Share-based compensation        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax assets (31) (33)    
Loss carryforwards        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax assets (417) (652)    
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 (39) (67)    
Deferred PRT        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred income tax assets $ (639) $ (439)