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Financial Instruments - Summary of Earnings Impact of (Gain) Loss from Risk Management Positions (Detail) - CAD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]        
(Gain) Loss on Risk Management   $ 1,636 $ 995 [1] $ 308 [1]
Net realized loss on crude oil contracts $ 467      
Realized (Gain) Loss        
Disclosure of detailed information about financial instruments [line items]        
(Gain) Loss on Risk Management   1,762 993 252
Unrealized (Gain) Loss        
Disclosure of detailed information about financial instruments [line items]        
(Gain) Loss on Risk Management   $ (126) $ 2 $ 56
[1] See Note 3X for revisions to prior period results.