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Areas of Judgment and Estimation Uncertainty - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of initial application of standards or interpretations [line items] |  |
Costs of suspending operations and remobilization of project |  | $ 434
Suspended capitalized costs |  | 103
Remaining portion |  | 49
COVID-19 costs (Note 4(c)) | $ 0 | 282
Other income (expense) |  |
Disclosure of initial application of standards or interpretations [line items] |  |
COVID-19 costs (Note 4(c)) |  | 282
Cost of sales |  |
Disclosure of initial application of standards or interpretations [line items] |  |
Costs of suspending operations and remobilization of project |  | 41
Social responsibility and donations |  |
Disclosure of initial application of standards or interpretations [line items] |  |
Costs of suspending operations and remobilization of project |  | $ 8

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