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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
	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

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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

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Namespace Prefix:	teo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration