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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, 2021
CAD ($)
$ / bbl
Dec. 31, 2020
CAD ($)
$ / bbl
WCS Forward Prices    
Disclosure Of Sensitivity Of Fair Value Measurement To Changes In Unobservable Inputs Liabilities [Line Items]    
Sensitivity Price Range | $ / bbl 5.00 5.00
Increase in volatility $ (45) $ (41)
Decrease in volatility $ 45 32
WTI Option Implied Volatility    
Disclosure Of Sensitivity Of Fair Value Measurement To Changes In Unobservable Inputs Liabilities [Line Items]    
Increase in volatility   (18)
Decrease in volatility   $ 17
Sensitivity Range 5.00% 5.00%
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   $ 7
Decrease in volatility   $ (10)
Sensitivity Range 5.00% 5.00%