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Trade and other receivables (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Disclosure Of Trade And Other Receivables [Line Items] |  |  |
Current tax receivable | $ 14 | $ 31 | $ 35
Other accounts receivable | 123 | 101 | 123
Total trade and other receivables | 3,006 | 3,129 | 2,988
Gross carrying amount |  |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |  |
Trade receivables | 3,026 | 3,135 | 2,973
Allowance for doubtful accounts |  |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |  |
Trade receivables | (51) | (54) | (60)
Allowance for revenue adjustments |  |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |  |
Trade receivables | $ (106) | $ (84) | $ (83)

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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 2018-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_b&doctype=Standard -URIDate 2018-03-16 + Details
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