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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, 2023 CAD ($) $ / bbl $ / MMcf $ / $ $ / MWh
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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 | $ 2
Decrease | $ (2)
Commodity price risk | WCS Hardisty |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |
Sensitivity Range | $ / bbl | 5.00
Increase | $ (23)
Decrease | $ 23
Commodity price risk | Refined Products |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |
Sensitivity Range | $ / bbl | 10.00
Increase | $ (5)
Decrease | $ 5
Commodity price risk | Natural Gas Contracts |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |
Sensitivity Range | $ / MMcf | 0.50
Increase | $ 1
Decrease | $ (1)
Commodity price risk | Power Commodity |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |
Sensitivity Range | $ / MWh | 20.00
Increase | $ 109
Decrease | $ (109)
Commodity price risk | Crude Oil Contracts |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |
Sensitivity Range | $ / bbl | 10.00
Increase | $ 0
Decrease | $ 0
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
Increase | $ 26
Decrease | $ (30)

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