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Risk Management - Impact of Fluctuating Commodity Prices and Interest Rates on Company'S Open Risk Management Positions (Detail) $ in Millions | Sep. 30, 2021 CAD ($) $ / bbl
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Commodity price risk | Crude Oil Contracts |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |
Sensitivity Range | $ / bbl | 5.00
Increase | $ (199)
Decrease | $ 199
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
Increase | $ 5
Decrease | $ (5)
Commodity price risk | Refined Products |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |
Sensitivity Range | $ / bbl | 5.00
Increase | $ (11)
Decrease | $ 11
Currency risk | U.S. to Canadian Dollar Exchange Rate |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |
Sensitivity Range | $ / bbl | 0.05
Increase | $ 11
Decrease | $ (12)

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