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DESCRIPTION OF BUSINESS AND BASIS OF PREPARATION OF THE CONSOLIDATED FINANCIAL STATEMENTS - Consumer Price Index (Details) - ARS ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Variation in Prices |  |  |  |
Amount of National CPI | $ 2,443,160 |  |  |
Number of years of accumulated consumer price index | 3 years |  |  |
Annual (as a percent) | 47.60% | 24.70% | 34.60% | 17.20%
Accumulated 3 years (as a percent) | 147.80% | 96.60% | 102.20% | 72.50%

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- Definition Represents the amount of National Consumer Price Index. + References No definition available. + Details
Name: | teo_AmountOfNationalConsumerPriceIndex
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Represents the duration of accumulated Price Index under both Consumer price index and wholesale price index. + References No definition available. + Details
Name: | teo_NumberOfYearsOfAccumulatedPriceIndex
Namespace Prefix: | teo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the percentage of accumulated Consumer Price Index. + References No definition available. + Details
Name: | teo_PercentageOfAccumulatedConsumerPriceIndex
Namespace Prefix: | teo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the percentage of consumer price index over a period. + References No definition available. + Details
Name: | teo_PercentageOfConsumerPriceIndex
Namespace Prefix: | teo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant