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Debt and Capital Structure - Schedule of Short-Term Borrowings (Detail) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about borrowings [line items]    
Short-Term Borrowings $ 179 $ 115
Uncommitted Demand Facilities    
Disclosure of detailed information about borrowings [line items]    
Short-Term Borrowings 0 0
WRB Refining LP    
Disclosure of detailed information about borrowings [line items]    
Short-Term Borrowings $ 179 $ 115