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v3.26.1

leases (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Income from subleasing right-of-use lease assets |  |  |  |
Co-location sublease revenue included in Operating revenues - service | $ 6 | $ 12 | $ 12 | $ 16
Other sublease revenue included in Other income | 1 | 2 | 3 | 3
Lease payments | $ 140 | $ 218 | $ 1,029 | $ 451

X
- Definition The amount of income from subleasing right-of-use assets. Sublease is a transaction for which an underlying asset is re-leased by a lessee (‘intermediate lessor’) to a third party, and the lease (‘head lease’) between the head lessor and lessee remains in effect. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2025-01-01 -Paragraph 53 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2025-en-r&anchor=para_53_f&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_IncomeFromSubleasingRightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | tu_IncomeFromSubleasingRightOfUseAssetsAbstract
Namespace Prefix: | tu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of payments on leases and subleases recognised as an expense by the lessee. + References No definition available. + Details
Name: | tu_LeaseAndSubleasePaymentsRecognisedAsExpense
Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of other income from subleasing right-of-use assets. Sublease is a transaction for which an underlying asset is re-leased by a lessee ('intermediate lessor') to a third party, and the lease ('head lease') between the head lessor and lessee remains in effect. + References No definition available. + Details
Name: | tu_OtherIncomeFromSubleasingRightOfUseAssets
Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration