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contingent liabilities (Details) $ in Millions	12 Months Ended		24 Months Ended
	Dec. 31, 2018 CAD ($)	Dec. 31, 2016 item	Dec. 31, 2018 CAD ($) item	Dec. 31, 2017 CAD ($)	Jan. 01, 2017 CAD ($)
Indemnification obligation
Contingent liability amount
Claims and lawsuits | 4G LTE Network patent infringement claim
Claims and lawsuits
Number of third-party patents involved in patent infringement claim | item		3
Number of third-party patent infringement claims abandoned | item			2
Claims and lawsuits | Area Code 867 blocking claim
Claims and lawsuits
Damages sought	135
Indemnification obligations
Indemnification obligation
Contingent liability amount	$ 0		$ 0

X

- Definition

The amount of the estimated financial effect of contingent liabilities. [Refer: Contingent liabilities [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2018-01-01
-Paragraph 86
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_86_a&doctype=Standard
-URIDate 2018-03-16

+ Details

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- Definition

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+ References

No definition available.

+ Details

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- Definition

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+ References

No definition available.

+ Details

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- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

No definition available.

+ Details

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- Definition

The number of third-party patents involved in the patent infringement claim.

+ References

No definition available.

+ Details

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- Definition

The number of third-party patent infringement claims that were abandoned during the period.

+ References

No definition available.

+ Details

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- Details

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