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advance billings and customer deposits - Contract liabilities (Details) - CAD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
advance billings and customer deposits
Contract liabilities at beginning of period	$ 1,135	$ 1,023	$ 1,102	$ 974
Revenue deferred in previous period and recognized in current period	(636)	(647)	(631)	(631)
Net additions arising from operations	654	674	682	691
Additions arising from business acquisitions	23	1	23	15
Contract liabilities at end of period	1,176	1,049	1,176	1,049
Current	1,026	942	1,026	942
Non-current
Deferred revenues	147	103	147	103
Deferred customer activation and connection fees	$ 3	$ 4	$ 3	$ 4

X

- Definition

The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
-Paragraph 105
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-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
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-URIDate 2024-03-27

+ Details

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

X

- Definition

The increase in contract liabilities resulting from business combinations. [Refer: Total for all business combinations [member]; Contract liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
-Paragraph 118
-Subparagraph a
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Period Type:	duration

X

- Definition

The amount of non-current deferred income including non-current contract liabilities. [Refer: Deferred income including contract liabilities]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 78
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78&doctype=Standard
-URIDate 2024-03-27

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

X

- References

No definition available.

+ Details

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

X

- Definition

The amount of current contract liabilities before reclassifications into and out of contract assets.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of deferred customer activation and connection fees classified as non current.

+ References

No definition available.

+ Details

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Namespace Prefix:	tu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

The increase in contract liabilities resulting from operation during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	tu_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Non-current.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Represents the information pertaining to revenue deferred in previous period and recognized in current period.

+ References

No definition available.

+ Details

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