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advance billings and customer deposits - Reconciliation of contract liabilities (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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advance billings and customer deposits |  |
Gross contract liabilities | $ 735 | $ 718
Reclassification to contract assets for contracts with contract liabilities less than contract assets | (133) | (166)
Reclassification from contract assets for contracts with contract assets less than contract liabilities | (10) | (7)
Contract liabilities | $ 592 | $ 545

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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 2020-01-01 -Paragraph 105 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_105&doctype=Standard -URIDate 2020-01-01 + Details
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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
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Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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