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Financial Instruments - Narrative (Detail)
$ in Millions
Sep. 30, 2023
CAD ($)
$ / bbl
Dec. 31, 2022
CAD ($)
Disclosure of detailed information about financial instruments [Line Items]    
Borrowings $ 7,224 $ 8,691
Discounted credit adjusted risk free rate 5.40%  
Sunrise Oil Sands Partnership    
Disclosure of detailed information about financial instruments [Line Items]    
Estimated fair value of contingent payment $ 295 419
Western Canadian Select Forward Pricing    
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 89.81  
West Texas Intermediate Option Volatility    
Disclosure of detailed information about financial instruments [Line Items]    
Average implied volatility contingent payment percentage 36.60%  
Foreign Exchange Average Volatility Rate Contingent    
Disclosure of detailed information about financial instruments [Line Items]    
Average implied volatility contingent payment percentage 5.90%  
Level 2 of fair value hierarchy    
Disclosure of detailed information about financial instruments [Line Items]    
Debt, fair value $ 6,200 $ 7,800