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Decommissioning Liabilities - Additional Information (Detail)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Feb. 28, 2023
CAD ($)
Disclosure of other provisions [line items]      
Credit-adjusted risk-free rate 6.10% 6.10%  
Inflation rate 0.02 0.02  
Restricted Cash $ 209 $ 209  
BP-Husky Refining LLC      
Disclosure of other provisions [line items]      
Carrying value of pre-existing decommissioning liabilities     $ 2