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Operating expenses - Other operating expenses (Details) - ARS ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating expenses
Transportation, freight and travel expenses	$ (927)	$ (961)	$ (768)
Delivery costs capitalized as SAC	79	134	85
Rental expense	(1,069)	(765)	(540)
Energy, water and others	(1,117)	(783)	(429)
International and satellite connectivity	(246)	(215)	(202)
Total other operating expenses	$ (3,280)	$ (2,590)	$ (1,854)

X

- Definition

The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'nature of expense' form for its analysis of expenses. [Refer: Expenses, by nature]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of expense recognised on rental activities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 1
-IssueDate 2017-01-01
-Paragraph 85
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-URIDate 2017-03-09

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The amount of expense arising from purchased utilities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
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Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of delivery costs, capitalized as Subscriber Acquisition Costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	teo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- References

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The amount of expense arising from international and satellite connectivity.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of expense arising from transportation, freight and travel.

+ References

No definition available.

+ Details

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Namespace Prefix:	teo_
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