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advance billings and customer deposits - Reconciliation of contract liabilities (Details) - CAD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
advance billings and customer deposits
Gross contract liabilities	$ 987	$ 886
Reclassification to contract assets of contracts with contract liabilities less than contract assets	(132)	(137)
Reclassification from contract assets of contracts with contract assets less than contract liabilities	(17)	(13)
Contract liabilities	$ 838	$ 736

X

- Definition

The amount of current contract liabilities. [Refer: Contract liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
-Paragraph 105
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_105&doctype=Standard
-URIDate 2024-03-27

+ Details

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

X

- References

No definition available.

+ Details

Name:	tu_AdvanceBillingsAndCustomerDepositsAbstract
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

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

X

- Definition

Reclassification from contract assets of contracts with contract assets less than contract liabilities.

+ References

No definition available.

+ Details

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

X

- Definition

Reclassification to contract assets of contracts with contract liabilities less than contract assets.

+ References

No definition available.

+ Details

Name:	tu_ReclassificationToContractAssetsForContractsWithContractLiabilitiesLessThanContractAssets
Namespace Prefix:	tu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant