The amount of undrawn borrowing facilities that may be available for future operating activities and to settle capital commitments. [Refer: Capital commitments]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2018-01-01
-Paragraph 50
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_50_a&doctype=Standard
-URIDate 2018-03-16

+ Details

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

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

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

- Definition

Total long-term borrowings, including the current and non-current portion.

+ References

No definition available.

+ Details

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

- Definition

The maximum amount of letters of credit that any individual participant could be required to deliver in order to participate in the spectrum wireless auction.

+ References

No definition available.

+ Details

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

- Definition

Represents the number of financial ratio tests defined in the agreement.

+ References

No definition available.

+ Details

Name:	tu_NumberOfFinancialRatioTests
Namespace Prefix:	tu_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Ratio of net debt divided by operating cash flow.

+ References

No definition available.

+ Details

Name:	tu_RatioOfNetDebtToOperatingCashFlow
Namespace Prefix:	tu_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Ratio of operating cash flow divided by interest expense.

+ References

No definition available.

+ Details

Name:	tu_RatioOfOperatingCashFlowToInterestExpense
Namespace Prefix:	tu_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Pertains to the TELUS Corporation unsecured revolving bank credit facility.

+ References

No definition available.

+ Details

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

- Details

Name:	ifrs-full_BorrowingsByNameAxis=tu_TelusCorporationCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	ifrs-full_BorrowingsByNameAxis=tu_TelusCorporationCommercialPaperMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=tu_InnovationScienceAndEconomicDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

long-term debt - TELUS Corporation credit facility (Details) $ in Millions, $ in Millions	Jun. 30, 2019 USD ($) item	Jun. 30, 2019 CAD ($) item	Dec. 31, 2018 CAD ($)	Jun. 30, 2018 CAD ($)
TELUS Corporation credit facility
Net available		$ 1,957	$ 1,476
Gross available		2,250	2,250
Long-term debt		$ 16,579	14,101	$ 14,145
TELUS Corporation credit facility
TELUS Corporation credit facility
Number of financial ratio tests \| item	2	2
Gross available		$ 2,250
Letters of credit outstanding		$ 182	184
TELUS Corporation credit facility \| Maximum
TELUS Corporation credit facility
Net debt to operating cash flow ratio	4.00	4.00
TELUS Corporation credit facility \| Minimum
TELUS Corporation credit facility
Operating cash flow to interest expense ratio	2.00	2.00
TELUS Corporation commercial paper
TELUS Corporation credit facility
Gross available		$ 1,400	1,400
Long-term debt	$ 224	293	$ 774
Innovation, Science and Economic Development
TELUS Corporation credit facility
Maximum letter of credit required to participate in wireless spectrum auction		$ 880