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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, 2024 CAD ($) $ / MMcf $ / barrel $ / $ $ / MWh | Dec. 31, 2023 CAD ($) $ / barrel $ / MMcf $ / MWh $ / $
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Crude Oil Contracts | Commodity price risk |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |
Sensitivity Range | $ / barrel | 10.00 | 10.00
Increase | $ 0 | $ (1)
Decrease | $ 0 | $ 1
Crude Oil and Condensate Differential Price | Commodity price risk |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |
Sensitivity Range | $ / barrel | 2.50 | 2.50
Increase | $ 20 | $ (4)
Decrease | $ (20) | $ 4
WCS (Hardisty) Differential Price | Commodity price risk |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |
Sensitivity Range | $ / barrel | 2.50 | 5.00
Increase | $ (6) | $ 0
Decrease | $ 6 | $ 0
Refined Products | Commodity price risk |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |
Sensitivity Range | $ / barrel | 10 | 10.00
Increase | $ (3) | $ (3)
Decrease | $ 3 | $ 3
Natural Gas Commodity Price | Commodity price risk |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |
Sensitivity Range | $ / MMcf | 0.50 | 1.00
Increase | $ 0 | $ 0
Decrease | $ 0 | $ 0
Natural Gas Basis Price | Commodity price risk |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |
Sensitivity Range | $ / MMcf | 0.25 | 0.50
Increase | $ 1 | $ 0
Decrease | $ (1) | $ 0
Power Commodity Price | Commodity price risk |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |
Sensitivity Range | $ / MWh | 10.00 | 20.00
Increase | $ 46 | $ 92
Decrease | $ (46) | $ (92)
U.S. to Canadian Dollar Exchange Rate | Currency risk |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |
Sensitivity Range | $ / $ | 0.05 | 0.05
Increase | $ 24 | $ 0
Decrease | $ (28) | $ 0

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