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OPERATING EXPENSES - Fees for services, maintenance, materials and supplies (Details) - ARS ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
OPERATING EXPENSES |  |  |
Maintenance and materials | $ (18,824) | $ (21,182) | $ (18,488)
Fees for services | (14,055) | (14,865) | (15,977)
Directors and Supervisory Committee's fees | (133) | (176) | (207)
Total fees for services, maintenance, materials and supplies | $ (33,012) | $ (36,223) | $ (34,672)

X
- Definition The amount of expense arising from directors and supervisory committee's fees. + References No definition available. + Details
Name: | teo_DirectorsAndSupervisoryCommitteesFees
Namespace Prefix: | teo_
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 The amount of expense relating to fees for services. + References No definition available. + Details
Name: | teo_FeesForServices
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expenses for fees for services, maintenance, materials and supplies. + References No definition available. + Details
Name: | teo_FeesForServicesMaintenanceMaterialsAndSuppliesExpense
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense arising from maintenance and materials. + References No definition available. + Details
Name: | teo_MaintenanceAndMaterials
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration