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Income Taxes - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Unused tax losses      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deductible temporary differences for which no deferred tax asset is recognised $ 1,000    
Unused tax credits      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deductible temporary differences for which no deferred tax asset is recognised 950    
Ninian Field in the North Sea | North Sea      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred corporate income tax recovery 50 $ 118 $ 528
Deferred PRT – North Sea $ (89) $ (205) $ (441)