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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, 2021 $ / bbl | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 $ / $ | Dec. 31, 2020 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 |  |  | 5.00
Increase |  | $ (225) |  | $ (44)
Decrease |  | 225 |  | $ 44
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 |  |  | 2.50
Increase |  | 4 |  | $ (2)
Decrease |  | (4) |  | $ 2
Commodity price risk | Refined Products |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |
Sensitivity Range | $ / bbl | 5.00 |  |  |
Increase |  | (2) |  |
Decrease |  | 2 |  |
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 |
Increase |  | 11 |  |
Decrease |  | $ (12) |  |

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