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Other (expense) income (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Analysis of income and expense [abstract] |  |
Net mark-to-market gains on derivatives used as economic hedges | $ 88 | $ 67
(Losses) gains on investments | (5) | 58
Equity losses from investments in associates and joint ventures |  |
Loss on investment | (22) | (57)
Operations | (9) | (32)
Losses on retirements and disposals of property, plant and equipment and intangible assets | (47) | (28)
Early debt redemption costs | (20) | (11)
Impairment of assets | (82) | (9)
Other | (5) | 33
Total other (expense) income | $ (102) | $ 21

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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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