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Other (expense) income (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Analysis of income and expense [abstract] |  |  |  |
Net mark-to-market gains on derivatives used as economic hedges | $ (30) | $ 1 | $ (107) | $ 25
Equity (losses) income from investments in associates and joint ventures |  |  |  |
Losses on investments | (20) | 0 | (20) | (2)
Operations | (20) | 12 | (3) | 31
Early debt redemption costs | (18) | (4) | (18) | (4)
Impairment of assets | 0 | 0 | (4) | 0
Losses on retirements and disposals of property, plant and equipment and intangible assets | (2) | (9) | (1) | (26)
Losses on investments | 0 | 0 | 0 | (12)
Other | 2 | (1) | 4 | 4
Total other (expense) income | $ (88) | $ (1) | $ (149) | $ 16

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- Definition Share Of Profit (Loss) Of Associates And Joint Ventures Accounted For Using Equity Method, Operations + References No definition available. + Details
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- Definition The gain (loss) arising from the difference between the carrying amount of the financial liability extinguished and the measurement of the consideration paid (equity instruments issued) to the creditor. [Refer: Carrying amount [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRIC -Number 19 -IssueDate 2017-01-01 -Paragraph 11 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRIC&num=19&date=2017-03-01&anchor=para_11&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_85&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The gains (losses) on disposals 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 2017-01-01 -Paragraph 98 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 130 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_d_ii&doctype=Standard -URIDate 2017-03-09 + Details
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