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Risk Management - Impact of Fluctuating Commodity Prices and Interest Rates on Company's Open Risk Management Positions (Detail)
$ in Millions
Dec. 31, 2021
$ / bbl
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
$ / $
Dec. 31, 2020
CAD ($)
$ / bbl
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
Increase   $ (225)   $ (44)
Decrease   225   $ 44
Commodity price risk | WCS and Condensate Differential        
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]        
Sensitivity Range | $ / bbl 2.50     2.50
Increase   4   $ (2)
Decrease   (4)   $ 2
Commodity price risk | Refined Products        
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]        
Sensitivity Range | $ / bbl 5.00      
Increase   (2)    
Decrease   2    
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  
Increase   11    
Decrease   $ (12)