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advance billings and customer deposits - Reconciliation of contract liabilities (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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advance billings and customer deposits |  |  |
Gross contract liabilities | $ 715 | $ 691 |
Reclassification to contract assets for contracts with contract liabilities less than contract assets | (154) | (146) |
Reclassification from contract assets for contracts with contract assets less than contract liabilities | (3) | (4) |
Current contract liabilities | $ 558 | $ 541 | $ 496

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- Definition The amount of current contract liabilities. [Refer: Contract liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 105 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_105&doctype=Standard -URIDate 2018-03-16 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition n/a + References No definition available. + Details
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Namespace Prefix: | tu_
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- Definition The amount of current contract liabilities before reclassifications into and out of contract assets. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Reclassification from contract assetss for contracts with contract assets less than contract liabilities. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Reclassification to contract assets for contracts with contract liabilities less than contract assets. + References No definition available. + Details
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Namespace Prefix: | tu_
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