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Summary of Significant Accounting Policies - Additional information (Detail) - CAD ($) $ / shares in Units, $ in Billions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2019
Information technology assets |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |
Useful life measured as period of time, property, plant and equipment | 3 years |
Land improvements and buildings | Bottom of range |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |
Useful life measured as period of time, property, plant and equipment | 15 years |
Land improvements and buildings | Top of range |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |
Useful life measured as period of time, property, plant and equipment | 40 years |
Office improvements and buildings | Bottom of range |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |
Useful life measured as period of time, property, plant and equipment | 3 years |
Office improvements and buildings | Top of range |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |
Useful life measured as period of time, property, plant and equipment | 15 years |
Refining equipment | Bottom of range |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |
Useful life measured as period of time, property, plant and equipment | 10 years |
Refining equipment | Top of range |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |
Useful life measured as period of time, property, plant and equipment | 60 years |
Other | Bottom of range |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |
Useful life measured as period of time, property, plant and equipment | 3 years |
Other | Top of range |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |
Useful life measured as period of time, property, plant and equipment | 60 years |
The Plan |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |
Target share price (in CAD per share) |  | $ 20
Target trading days |  | 20 days
The Incentive Plan |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |
Target run-rate synergies | $ 1.0 |
The Incentive Plan | Minimum |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |
Cash award percentage of base salary | 15.00% |
The Incentive Plan | Maximum |  |
Disclosure Of Summary Of Significant Accounting Policies [Line Items] |  |
Cash award percentage of base salary | 30.00% |

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