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Capital Commitments - Additional Information (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of finance lease and operating lease by lessee [Line Items] |  |
Commitments to purchase property, plant and equipment | $ 113 | $ 113
2021 [Member] |  |
Disclosure of finance lease and operating lease by lessee [Line Items] |  |
Commitments to purchase property, plant and equipment | 24 |
2022 [Member] |  |
Disclosure of finance lease and operating lease by lessee [Line Items] |  |
Commitments to purchase property, plant and equipment | 53 |
2023 [Member] |  |
Disclosure of finance lease and operating lease by lessee [Line Items] |  |
Commitments to purchase property, plant and equipment | $ 36 |

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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 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Line items representing commitments. + References No definition available. + Details
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- Details
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- Details
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- Details
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