v3.19.2

advance billings and customer deposits - Reconciliation of contract liabilities (Details) - CAD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | --- | ---
advance billings and customer deposits |  |  |
Gross contract liabilities | $ 732 |  | $ 691
Reclassification to contract assets for contracts with contract liabilities less than contract assets | (155) |  | (142)
Reclassification from contract assets for contracts with contract assets less than contract liabilities | (5) |  | (5)
Current contract liabilities | $ 572 | $ 561 | $ 544

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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
Name: | ifrs-full_CurrentContractLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition n/a + References No definition available. + Details
Name: | tu_AdvanceBillingsAndCustomerDepositsAbstract
Namespace Prefix: | tu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of current contract liabilities before reclassifications into and out of contract assets. + References No definition available. + Details
Name: | tu_CurrentContractLiabilitiesBeforeReclassificationIntoOutOfContractAssets
Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Reclassification from contract assets for contracts with contract assets less than contract liabilities. + References No definition available. + Details
Name: | tu_ReclassificationFromContractAssetsForContractsWithContractAssetsLessThanContractLiabilities
Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Reclassification to contract assets for contracts with contract liabilities less than contract assets. + References No definition available. + Details
Name: | tu_ReclassificationToContractAssetsForContractsWithContractLiabilitiesLessThanContractAssets
Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant