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Capital Commitments - Additional Information (Detail) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of capital commitments [Line Items] |  |
Commitments to purchase property, plant and equipment | $ 137 | $ 113
2022 [Member] |  |
Disclosure of capital commitments [Line Items] |  |
Commitments to purchase property, plant and equipment | 42 |
2023 [Member] |  |
Disclosure of capital commitments [Line Items] |  |
Commitments to purchase property, plant and equipment | 60 |
2024 [Member] |  |
Disclosure of capital commitments [Line Items] |  |
Commitments to purchase property, plant and equipment | $ 35 |

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- Definition The amount of future capital expenditures that the entity is committed to make. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Details
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