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Financial Instruments - Summary of Changes in Inputs to Option Pricing Model, Resulted in Unrealized Gains (Losses) Impacting Earnings Before Income Tax (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2022
CAD ($)
$ / bbl
$ / $
Dec. 31, 2021
CAD ($)
$ / bbl
WCS Forward Prices    
Disclosure Of Sensitivity Of Fair Value Measurement To Changes In Unobservable Inputs Liabilities [Line Items]    
Sensitivity Price Range | $ / bbl 10.00 5.00
Increase in volatility $ (68) $ (45)
Decrease in volatility 157 $ 45
WTI Option Implied Volatility    
Disclosure Of Sensitivity Of Fair Value Measurement To Changes In Unobservable Inputs Liabilities [Line Items]    
Increase in volatility (1)  
Decrease in volatility $ 4  
Sensitivity Range 10.00%  
Canadian to U.S. Dollar Foreign Exchange Rate Option Implied Volatility    
Disclosure Of Sensitivity Of Fair Value Measurement To Changes In Unobservable Inputs Liabilities [Line Items]    
Increase in volatility $ 0  
Decrease in volatility $ 0  
Sensitivity Range | $ / $ 5.00%