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OPERATING EXPENSES - Taxes and fees with the Regulatory Authority (Details) - ARS ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
OPERATING EXPENSES
Turnover tax	$ (8,539)	$ (11,324)	$ (3,318)
Municipal taxes	(2,456)	(2,786)	(1,578)
Other taxes and fees	(7,390)	(6,826)	(2,579)
Total taxes and fees with the regulatory authority	$ (18,385)	$ (20,936)	$ (7,475)

X

- Definition

The amount of tax expense exclusive of income tax expense.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 85
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_85&doctype=Standard
-URIDate 2018-03-16

+ Details

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

X

- References

No definition available.

+ Details

Name:	teo_DisclosureOfOperatingExpensesAbstract
Namespace Prefix:	teo_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of municipal taxes.

+ References

No definition available.

+ Details

Name:	teo_MunicipalTaxes
Namespace Prefix:	teo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of other taxes and fees.

+ References

No definition available.

+ Details

Name:	teo_OtherTaxesAndFees
Namespace Prefix:	teo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of tax on turnover.

+ References

No definition available.

+ Details

Name:	teo_TurnoverTax
Namespace Prefix:	teo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration