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Financial Instruments - Additional information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2022
CAD ($)
$ / bbl
Aug. 31, 2022
CAD ($)
Jun. 13, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Disclosure of detailed information about financial instruments [line items]        
Total Debt $ 8,691     $ 12,385
Cash collateral for risk management contracts price change $ 211     114
Discounted credit adjusted risk free rate 5.20%      
Conoco Phillips Company and certain of its subsidiaries        
Disclosure of detailed information about financial instruments [line items]        
Proportion of ownership interest in joint operation 5000.00%      
Sunrise Oil Sands Partnership        
Disclosure of detailed information about financial instruments [line items]        
Estimated fair value of contingent payment $ 419     0
Initial Recognition   $ 600 $ 600  
WCS Forward Prices        
Disclosure of detailed information about financial instruments [line items]        
Average forward price for Western Canadian Select Crude Oil for the remaining term (in CAD per barrel) | $ / bbl 72.79      
WTI Option Implied Volatility        
Disclosure of detailed information about financial instruments [line items]        
Average implied volatility contingent payment percentage 4420.00%      
U.S. to Canadian Dollar Foreign Exchange Average Rate Volatility Contingent Payment        
Disclosure of detailed information about financial instruments [line items]        
Average implied volatility contingent payment percentage 760.00%      
Level 2 of fair value hierarchy        
Disclosure of detailed information about financial instruments [line items]        
Debt, fair value $ 7,800     $ 13,700