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Risk Management - Impact of Fluctuating Commodity Prices and Interest Rates on Company's Open Risk Management Positions (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2021
CAD ($)
$ / bbl
Dec. 31, 2020
CAD ($)
$ / bbl
Dec. 31, 2021
$ / $
Commodity price risk | Crude Oil Contracts      
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]      
Sensitivity Range | $ / bbl 5.00 5.00  
Currency risk      
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]      
$0.05 Increase in the Canadian per U.S. Dollar Foreign Exchange Rate $ 372 $ 300  
$0.05 Decrease in the Canadian per U.S. Dollar Foreign Exchange Rate $ (372) $ (300)  
Currency risk | U.S. to Canadian Dollar Exchange Rate      
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]      
Sensitivity Range 0.05   0.05