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CASH AND CASH EQUIVALENTS AND INVESTMENTS. ADDITIONAL INFORMATION ON THE CONSOLIDATED STATEMENTS OF CASH FLOWS - Main non-cash operating transactions (Details) - ARS ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Main non-cash operating transactions: |  |
Offsetting of dividends receivable with financial debt | $ 5 | $ 12

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- Definition No definition available + References No definition available. + Details
Name: | teo_CashFlowNoncashOperatingActivitiesAbstract
Namespace Prefix: | teo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount represents the offsetting of dividends receivable for financial debt. + References No definition available. + Details
Name: | teo_DividendsReceivableOffsetWithFinancialDebt
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration