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OPERATING EXPENSES - Taxes and fees with the Regulatory Authority (Details) - ARS ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
OPERATING EXPENSES |  |  |
Turnover tax | $ (10,929) | $ (11,625) | $ (15,417)
Municipal taxes | (3,132) | (3,344) | (3,793)
Other taxes and fees | (8,959) | (10,060) | (9,292)
Total taxes and fees with the regulatory authority | $ (23,020) | $ (25,029) | $ (28,502)

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 2020-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_85&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_TaxExpenseOtherThanIncomeTaxExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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

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- 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

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- 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