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leases (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income from subleasing right-of-use lease assets
Portion of real estate right-of-use assets that are subleased, as a percent	20.00%
Co-location sublet revenue included in operating service revenues	$ 17	$ 18
Other sublet revenue included in other income	4	2
Lease payments	$ 434	$ 400

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 2020-01-01
-Paragraph 53
-Subparagraph f
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_f&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_IncomeFromSubleasingRightofuseAssets
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 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

X

- Definition

The portion of real estate right-of-use assets that are subleased, as a percent.

+ References

No definition available.

+ Details

Name:	tu_PercentOfRightOfUseAssetsSubleased
Namespace Prefix:	tu_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration