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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, 2022 $ / barrel | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 MMcf | Dec. 31, 2022 MWh | Dec. 31, 2022 $ / $ | Dec. 31, 2022 $ / $ | Dec. 31, 2021 CAD ($) $ / barrel $ / $
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Commodity price risk | WCS and Condensate Differential Price (1) |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |
Sensitivity Range | $ / barrel | 2.50 |  |  |  |  |  | 2.50
Increase |  | $ 13 |  |  |  |  | $ 4
Decrease |  | (13) |  |  |  |  | $ (4)
Commodity price risk | Refined Products |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |
Sensitivity Range | $ / barrel | 10 |  |  |  |  |  | 5.00
Increase |  | (2) |  |  |  |  | $ (2)
Decrease |  | 2 |  |  |  |  | $ 2
Commodity price risk | Natural Gas Basis Price |  |  |  |  |  |  |
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 Price |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |
Sensitivity Range | MWh |  |  |  | 20.00 |  |  |
Increase |  | 113 |  |  |  |  |
Decrease |  | (113) |  |  |  |  |
Commodity price risk | Crude Oil Contracts |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |
Sensitivity Range | $ / barrel | 10.00 |  |  |  |  |  | 5.00
Increase |  | 1 |  |  |  |  | $ (225)
Decrease |  | (1) |  |  |  |  | $ 225
Commodity price risk | WCS Alberta Differential Price |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |
Sensitivity Range | $ / barrel | 5.00 |  |  |  |  |  |
Increase |  | (1) |  |  |  |  |
Decrease |  | 1 |  |  |  |  |
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 | 0.05
Increase |  | 14 |  |  |  |  | $ 11
Decrease |  | $ (17) |  |  |  |  | $ (12)

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