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Other (Income) Loss, Net - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Other Income And Expense [Line Items] |  |  |
Other (Income) Loss, Net | $ 40 | $ 9 | $ 13
Lease income | 24 | $ 17 |
Keystone XL Pipeline Project [Member] |  |  |
Disclosure Other Income And Expense [Line Items] |  |  |
Other (Income) Loss, Net | 100 |  |
CEWS Program [Member] |  |  |
Disclosure Other Income And Expense [Line Items] |  |  |
Other income | $ 40 |  |

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- Definition The gains (losses) that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_102&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_103&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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