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Other income (expense) - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Analysis of income and expense [abstract] |  |
(Loss) gain on investment, equity loss of share obligation | $ 49 | $ (43)
Losses on disposals of property, plant and equipment |  | $ 45

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- Definition Share Of Profit (Loss) Of Associates And Joint Ventures Accounted For Using Equity Method, Share of Obligation to Purchase + References No definition available. + Details
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- Definition The losses on the disposal of property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 98 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_98_c&doctype=Standard -URIDate 2021-03-24 + Details
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