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Decommissioning Liabilities - Additional Information (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Aug. 31, 2022
Dec. 31, 2021
Disclosure of other provisions [line items]      
Estimated future cash flows required to settle the obligation $ 14,000   $ 14,000
Credit-adjusted risk-free rate 6.10%   4.40%
Inflation rate 2.00%   2.00%
Restricted Cash $ 209   $ 186
Sunrise Oil Sands Partnership      
Disclosure of other provisions [line items]      
Carrying value of pre-existing decommissioning liabilities   $ 11  
Bottom of range      
Disclosure of other provisions [line items]      
Expected settlement of decommissioning liabilities 250    
Top of range      
Disclosure of other provisions [line items]      
Expected settlement of decommissioning liabilities $ 300