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leases (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 CAD ($)	Dec. 31, 2023 CAD ($)
Income from subleasing right-of-use lease assets
Co-location sublet revenue included in Operating revenues - service	$ 17	$ 17
Other sublet revenue included in Other income	8	5
Lease payments	$ 826	$ 671
Maximum
Income from subleasing right-of-use lease assets
Portion of real estate right-of-use assets that are subleased, as a percent	20.00%
Mobile site leases
Potential exposure to non-executory cash outflows not including in lease liabilities
Lease payments with index based price adjustments	0.33

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 2024-01-01
-Paragraph 53
-Subparagraph f
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_f&doctype=Standard
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	tu_IncomeFromSubleasingRightOfUseAssetsAbstract
Namespace Prefix:	tu_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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 portion of lease payments with consumer price index-based price adjustments, resulting in future periodic remeasurements of the lease liability.

+ References

No definition available.

+ Details

Name:	tu_LeasePaymentsWithIndexBasedPriceAdjustments
Namespace Prefix:	tu_
Data Type:	xbrli:pureItemType
Balance Type:	na
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

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

X

- Definition

The portion of real estate right-of-use assets that have co-location subleases that we account for as operating leases, as a percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	tu_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	tu_PotentialExposureToNonExecutoryCashOutflowsNotIncludedInLeaseLiabilities
Namespace Prefix:	tu_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfAssetsAxis=tu_MobileSiteLeasesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: