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Integration and Transaction Costs (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about business combination [line items]      
Integration and Transaction Costs $ 106 $ 349 [1] $ 29 [1]
Husky Energy, Inc.      
Disclosure of detailed information about business combination [line items]      
Integration and Transaction Costs 90 $ 349 $ 29
Sunrise Oil Sands Partnership And Toledo CGU      
Disclosure of detailed information about business combination [line items]      
Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination $ 16    
[1] See Note 3X for revisions to prior period results.