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v3.26.1

employee future benefits - Defined contribution pension plans expense (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
employee future benefits |  |  |  |
Union pension plan contributions | $ 3 | $ 3 | $ 6 | $ 6
Other defined contribution pension plans | 28 | 29 | 56 | 57
Total | $ 31 | $ 32 | $ 62 | $ 63

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- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 53 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_53&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 203 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_203&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 203 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_203&doctype=Standard -URIDate 2025-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition The amount of traditional post-employment benefit expense relating to defined contribution plans that the entity does not separately disclose in the same statement or note. + References No definition available. + Details
Name: | tu_PostemploymentBenefitExpenseDefinedContributionPlansOther
Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of post-employment benefit expense relating to defined contribution plans relating to union pension plan and public service pension plan contributions. + References No definition available. + Details
Name: | tu_PostemploymentBenefitExpenseDefinedContributionPlansUnionPensionAndPublicServicePlans
Namespace Prefix: | tu_
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Period Type: | duration