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REGULATORY FRAMEWORK - Universal Service Regulation (Details) - ARS ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Sep. 13, 2012 | Apr. 08, 2011
Regulatory framework |  |  |
Contribution to SU Fund, percentage | 1.00% |  |
Monthly obligation settlement percentage of total contribution | 30.00% |  |
Receivable from regulatory authority | $ 13,229 |  |
Investments included in the unrecorded accounts receivable |  |  | $ 13,512
Additional investments included in the unrecorded accounts receivable |  |  | $ 1,541
Deposit payable, as required by the CNC |  | $ 208 |
Minimum |  |  |
Regulatory framework |  |  |
Minimum percentage of teledensity required for not providing contribution to SU fund | 15.00% |  |

X
- Definition Represents the additional amount of investments in high-cost areas included in the unrecorded accounts receivable. + References No definition available. + Details
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Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The percentage of total accrued revenues licensees are required to contribute to the SU Fund. + References No definition available. + Details
Name: | teo_ContributionToSuFundPercentageOfTotalAccruedRevenues
Namespace Prefix: | teo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of deposit liability, as required by the Argentine National Communications Commission (CNC). + References No definition available. + Details
Name: | teo_DepositLiabilityRequiredByArgentineNationalCommunicationsCommission
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Represents the amount of investments in high-cost areas included in the unrecorded accounts receivable. + References No definition available. + Details
Name: | teo_InvestmentsIncludedInUnrecordedAccountsReceivable
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Monthly obligation settlement percentage of total contribution. + References No definition available. + Details
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Namespace Prefix: | teo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of teledensity required to be maintained by local service providers. + References No definition available. + Details
Name: | teo_PercentageOfTeledensityConsideredForExemptionFromContributionToSuFund
Namespace Prefix: | teo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of receivable from regulatory authority under contributions. + References No definition available. + Details
Name: | teo_ReceivableFromRegulatoryAuthorityUnderContributions
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |