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SIGNIFICANT ACCOUNTING POLICIES - Interests in Joint Operations (Details) - UTE Ertach - Cablevision		12 Months Ended
	Apr. 26, 2019	Dec. 31, 2019
Interests in Joint Operations
Ownership interest in joint venture (in percentage)		50.00%
Extension period for agreement	6 months

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- 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

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
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Period Type:	duration

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- Definition

The proportion of ownership interest in a joint operation attributable to the entity. [Refer: Joint operations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2018-01-01
-Paragraph 21
-Subparagraph a
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_21_a_iv&doctype=Standard
-URIDate 2018-03-16

+ Details

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Balance Type:	na
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- Definition

Extension period for agreement under joint operations arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	teo_
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Period Type:	duration

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- Details

Name:	ifrs-full_JointOperationsAxis=teo_UteErtachCablevisionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: