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Other (Income) Loss, Net (Details) - CAD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
2018 Superior Refinery        
Disclosure of attribution of expenses by nature to their function [line items]        
Proceeds from insurance $ 0 $ 0 $ 268,000,000 $ 45,000,000
2018 Atlantic Region        
Disclosure of attribution of expenses by nature to their function [line items]        
Proceeds from insurance $ 5,000,000 $ 0 $ 57,000,000 $ 0