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DESCRIPTION OF BUSINESS AND BASIS OF PREPARATION OF THE CONSOLIDATED FINANCIAL STATEMENTS - Consumer Price Index (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Variation in Prices |  |  |  |
National Consumer Price Index | 284.44 | 184.26 | 124.8 | 100
Annual (as a percent) | 53.80% | 47.60% | 24.70% | 34.60%
Accumulated 3 years (as a percent) | 183.20% | 147.80% | 96.60% | 102.20%

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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 Value of national consumer price index calculated on the basis of cost of market in the given year to cost of market in the base year. + References No definition available. + Details
Name: | teo_NationalConsumerPriceIndex
Namespace Prefix: | teo_
Data Type: | xbrli:pureItemType
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