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advance billings and customer deposits - Reconciliation of contract liabilities (Details) - CAD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
advance billings and customer deposits
Gross contract liabilities	$ 715	$ 691
Reclassification to contract assets for contracts with contract liabilities less than contract assets	(154)	(146)
Reclassification from contract assets for contracts with contract assets less than contract liabilities	(3)	(4)
Current contract liabilities	$ 558	$ 541	$ 496

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 2018-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_105&doctype=Standard
-URIDate 2018-03-16

+ Details

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

X

- Definition

n/a

+ 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

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

X

- Definition

Reclassification from contract assetss for 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 for 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