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Other (expense) income - Narrative (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Analysis of income and expense [abstract] |  |  |  |
Losses on disposals of property, plant and equipment | $ 45 |  |  |
Share of obligation to repurchase at fair value the minority interest in joint venture | $ 11 | $ (53) | $ 21 | $ (53)

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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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- 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 2019-01-01 -Paragraph 98 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_98_c&doctype=Standard -URIDate 2019-03-27 + Details
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