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CASH AND CASH EQUIVALENTS AND INVESTMENTS. ADDITIONAL INFORMATION ON THE CONSOLIDATED STATEMENTS OF CASH FLOWS - Movements in the allowance of credit risk (Details) - ARS ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Movements in the allowance of current credit risk |  |
At the beginning of the fiscal year | $ (87) |
Additions - Exchange differences | (50) |
Additions - Risk of doubtful government bonds results | (16) | $ (1,552)
Reclassifications | (503) |
Uses (includes RECPAM) | 576 | 1,465
At the end of the year | (80) | (87)
Movements in the allowance of non-current credit risk |  |
At the beginning of the fiscal year | (1,333) |
Additions - Exchange differences | (220) |
Additions - Risk of doubtful government bonds results | (42) | (1,945)
Reclassifications | 503 |
Uses (includes RECPAM) | 875 | 612
At the end of the year | $ (217) | $ (1,333)

X
- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses, classified as current. + References No definition available. + Details
Name: | teo_AllowanceAccountForCreditLossesOfFinancialAssetsCurrent
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses, classified as non-current. + References No definition available. + Details
Name: | teo_AllowanceAccountForCreditLossesOfFinancialAssetsNonCurrent
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The increase (decrease) in an allowance account for current credit losses of financial assets resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. + References No definition available. + Details
Name: | teo_IncreaseDecreaseThroughNetExchangeDifferencesCurrentAllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in an allowance account for non current credit losses of financial assets resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. + References No definition available. + Details
Name: | teo_IncreaseDecreaseThroughNetExchangeDifferencesNonCurrentAllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) through other changes in current allowance account for credit losses of financial assets resulting from changes that the entity does not separately disclose in the same statement or note. + References No definition available. + Details
Name: | teo_IncreaseDecreaseThroughOtherChangesInCurrentAllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) through other changes in non current allowance account for credit losses of financial assets resulting from changes that the entity does not separately disclose in the same statement or note. + References No definition available. + Details
Name: | teo_IncreaseDecreaseThroughOtherChangesInNonCurrentAllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

X
- Definition The amount of reclassification on current allowance for credit losses. + References No definition available. + Details
Name: | teo_ReclassificationsOnCurrentAllowanceForCreditLosses
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of reclassification on non current allowance for credit losses. + References No definition available. + Details
Name: | teo_ReclassificationsOnNonCurrentAllowanceForCreditLosses
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The decrease in an current allowance account for credit losses of financial assets resulting from the utilisation of the allowance. + References No definition available. + Details
Name: | teo_UtilisationCurrentAllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The decrease in an non-current allowance account for credit losses of financial assets resulting from the utilisation of the allowance. + References No definition available. + Details
Name: | teo_UtilisationNonCurrentAllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration