DESCRIPTION OF BUSINESS AND BASIS OF PREPARATION OF THE CONSOLIDATED FINANCIAL STATEMENTS - Consumer Price Index (Details)	12 Months Ended
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%

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.

No definition available.

Name:	teo_NationalConsumerPriceIndex
Namespace Prefix:	teo_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration