The interest rate on borrowings. [Refer: Borrowings]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2018-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard
-URIDate 2018-03-16

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2018-01-01
-Paragraph 50
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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

The weighted average interest rate on borrowings.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Borrowings that are outstanding at the reporting date, excluding unamortized costs.

+ References

No definition available.

+ Details

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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

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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

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

+ References

No definition available.

+ Details

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- Definition

Percentage of principal advance to repay.

+ References

No definition available.

+ Details

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

- Definition

Ratio of net debt divided by operating cash flow.

+ References

No definition available.

+ Details

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Data Type:	xbrli:pureItemType
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Period Type:	instant

- Definition

Operating cash flows divided by interest and scheduled principal repayment.

+ References

No definition available.

+ Details

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Namespace Prefix:	tu_
Data Type:	xbrli:pureItemType
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long-term debt - TELUS International (Cda) Inc. credit facility and Lease Liabilities (Details) $ in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($) item	Jun. 30, 2019 CAD ($) item	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CAD ($)	Jun. 30, 2018 CAD ($)
long-term debt
Maximum aggregate amount of credit facility		$ 2,250		$ 2,250
Long-term debt		16,579		14,101	$ 14,145
Undrawn borrowing facilities		$ 1,957		$ 1,476
Lease liabilities
long-term debt
Weighted average interest rate	4.59%	4.59%
TELUS International (Cda) Inc. credit facility
long-term debt
Maximum aggregate amount of credit facility	$ 460		$ 463
Outstanding	307		313
Undrawn borrowing facilities	$ 153		150
Number of financial ratio tests \| item	2	2
Percentage of principal advance to repay	5.00%
TELUS International (Cda) Inc. credit facility \| Minimum
long-term debt
Operating cash flow to debt service ratio	1.50	1.50
TELUS International (Cda) Inc. credit facility \| Maximum
long-term debt
Net debt to operating cash flow ratio	3.25	3.25
Revolving component
long-term debt
Maximum aggregate amount of credit facility	$ 350		350
Outstanding	197		200
Undrawn borrowing facilities	$ 153		150
Weighted average interest rate	3.83%	3.83%
Term loan component
long-term debt
Maximum aggregate amount of credit facility	$ 120		120
Outstanding	$ 110		$ 113
Term loan component \| Fixed interest rate
long-term debt
Fixed interest rate	2.64%	2.64%