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REGULATORY FRAMEWORK - Universal Service Regulation (Details) - ARS ($) $ in Millions		12 Months Ended
	May 31, 2016	Dec. 31, 2018	Oct. 01, 2012	Sep. 13, 2012	Jan. 31, 2011
Regulatory framework
Contribution to SU Fund, percentage		1.00%
Unrecorded accounts receivable		$ 3,998
Investments included in the unrecorded accounts receivable		3,849
Deductions included in the unrecorded accounts receivable		$ 1,194
Deposit payable, as required by the CNC				$ 208
Personal
Regulatory framework
Deposits with the Bank, SU					$ 112
Deposits with the CNC, under protest			$ 23
Minimum
Regulatory framework
Minimum percentage of teledensity required for not providing contribution to SU fund		15.00%
ICT Services
Regulatory framework
Contribution to SU Fund, percentage	1.00%	1.00%

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 deductions that were objected by the SC Resolutions included in the unrecorded accounts receivable.

+ References

No definition available.

+ Details

Name:	teo_DeductionsIncludedInUnrecordedAccountsReceivable
Namespace Prefix:	teo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

Represents the amount of deposit under protest with the Argentine National Communications Commission (CNC).

+ References

No definition available.

+ Details

Name:	teo_DepositsWithArgentineNationalCommunicationsCommissionUnderProtest
Namespace Prefix:	teo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the amount of deposit with the banks.

+ References

No definition available.

+ Details

Name:	teo_DepositsWithBanks
Namespace Prefix:	teo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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

X

- 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

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

Represents the amount of the estimated accounts receivable yet to be recorded.

+ References

No definition available.

+ Details

Name:	teo_UnrecordedAccountsReceivable
Namespace Prefix:	teo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=teo_PersonalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	teo_IfrsTypeOfArrangementAxis=teo_IctServicesLicenseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: