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Trade and other receivables (Details) - CAD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure Of Trade And Other Receivables [Line Items] |  |
Current tax receivable | $ 31 | $ 35
Other accounts receivable | 101 | 122
Total trade and other receivables | 3,135 | 2,979
Gross carrying amount |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |
Trade receivables | 3,138 | 2,967
Allowance for doubtful accounts |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |
Trade receivables | (55) | (60)
Allowance for revenue adjustments |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |
Trade receivables | $ (80) | $ (85)

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- Definition The amount of current receivables from taxes other than income tax. [Refer: Receivables from taxes other than income tax] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_b&doctype=Standard -URIDate 2017-03-09 + Details
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