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Income Taxes - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
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 1,000    
North Sea      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred PRT – North Sea 441 $ 0 $ 0
Accumulated depletion and depreciation | Operating segments | North Sea      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred corporate income tax recovery $ 528