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advance billings and customer deposits - Contract liabilities (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
advance billings and customer deposits |  |
Contract liabilities at beginning of period | $ 780 | $ 732
Revenue deferred in previous period and recognized in current period | 689 | 670
Net additions arising from operations | 708 | 718
Regulatory deferral account drawdown |  | (7)
Additions arising from business combinations | 9 | 7
Contract liabilities at end of period | 808 | 780
Current | 715 | 691
Non-current |  |
Deferred revenues | 78 | 71
Deferred customer activation and connection fees | $ 15 | $ 18

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- Definition The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer. + 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 116 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_116_a&doctype=Standard -URIDate 2018-03-16 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The increase in contract liabilities resulting from business combinations. [Refer: Business combinations [member]; Contract liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_118_a&doctype=Standard -URIDate 2018-03-16 + Details
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Period Type: | duration

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- Definition The amount of rent deferred income classified as non-current. [Refer: Rent deferred income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of revenue that was included in the contract liability balance at the beginning of the period. [Refer: Contract liabilities; Revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 116 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_116_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition n/a + References No definition available. + Details
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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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Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
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- Definition The decrease in contract liability resulting from regulatory deferral account drawdown. + References No definition available. + Details
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- Definition The amount of deferred customer activation and connection fees classified as non current. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- Definition The increase in contract liabilities resulting from operation during the period. + References No definition available. + Details
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- Definition Non-current. + References No definition available. + Details
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