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long-term debt - TELUS Corporation commercial paper (Details) $ in Millions, $ in Millions	Jan. 01, 2019 CAD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CAD ($)	Dec. 31, 2017 CAD ($)	Jan. 01, 2017 CAD ($)
TELUS Corporation commercial paper
Maximum aggregate amount of credit facility			$ 2,250	$ 2,250
Current portion of non-current borrowings	$ 800		836	1,404	$ 1,327
Long-term debt			14,101	13,660
TELUS Corporation commercial paper
TELUS Corporation commercial paper
Maximum aggregate amount of credit facility			1,400	1,400
Long-term debt		$ 569	$ 774	$ 1,140
Weighted average interest rate		3.02%	3.02%
TELUS Corporation credit facility
TELUS Corporation commercial paper
Maximum aggregate amount of credit facility			$ 2,250
Current portion of non-current borrowings			$ 0

X

- Definition

The current portion of non-current borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&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

The effective weighted average interest rate on borrowings.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

X

- 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

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

Pertains to the TELUS Corporation unsecured commercial paper program.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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