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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, 2024 CAD ($) $ / MMcf $ / bbl $ / MWh $ / $
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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 | 10.00
Increase | $ 1
Decrease | $ (1)
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 | $ 10
Decrease | $ (10)
Commodity price risk | WCS Hardisty |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |
Sensitivity Range | $ / bbl | 5.00
Increase | $ (17)
Decrease | $ 17
Commodity price risk | Refined Products |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |
Sensitivity Range | $ / bbl | 10.00
Increase | $ 0
Decrease | $ 0
Commodity price risk | Natural Gas Commodity Price |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |
Sensitivity Range | $ / MMcf | 1.00
Increase | $ 0
Decrease | $ 0
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 | $ 89
Decrease | $ (89)
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 | $ 11
Decrease | $ (12)

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