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other income (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
other income |  |
Government assistance | $ 5 | $ 13
Other sublease revenue | 8 | 5
Gain on contributions of real estate to joint ventures | 110 | 35
Investment income (loss), gain (loss) on disposal of assets and other | 24 | (16)
Interest income | 6 | 6
Changes in provisions related to business combinations | 94 | 68
Total | 247 | 111
Gain arising from the cessation of leases | 30 |
Quebec employment positions tax credit | $ 5 | $ 3

X
- Definition The amount of revenue arising from sources that the entity does not separately disclose in the same statement or note. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The amount of gain arising from the cessation of leases. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of gain on contributions of real estate to joint ventures. + References No definition available. + Details
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Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
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- Definition Government assistance income, including deferral account amortization + References No definition available. + Details
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Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Interest income from real estate joint ventures. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Changes in the business combination-related provisions that are recognized in other operating income. + References No definition available. + Details
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Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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
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Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Other Operating Income items + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Investment income, gains on the disposal of assets, and other income recognized in other operating income. + References No definition available. + Details
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Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition An amount deducted from an entities' income taxes related to employment positions in the province of Quebec. + References No definition available. + Details
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