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SIGNIFICANT ACCOUNTING POLICIES - Control (Details) $ / shares in Units, $ in Millions |  |  |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 19, 2021 ARS ($) $ / shares shares | Jan. 11, 2021 ARS ($) | Dec. 30, 2020 $ / shares shares | Dec. 21, 2020 ARS ($) $ / shares shares | Nov. 10, 2020 ARS ($) | Jun. 27, 2019 ARS ($) $ / shares | Dec. 31, 2020 USD ($) item | Dec. 31, 2019 ARS ($) $ / shares | Dec. 31, 2020 $ / shares | Sep. 25, 2019 USD ($) shares | Sep. 25, 2019 ARS ($) $ / shares shares | Sep. 04, 2019
Control |  |  |  |  |  |  |  |  |  |  |  |
Par value (in argentine peso per share) | $ / shares |  |  |  |  |  |  |  | $ 1 | $ 1 |  |  |
Tuves Paraguay |  |  |  |  |  |  |  |  |  |  |  |
Control |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  |  |  |  |  |  | 30.00%
Adjustment to the non-controlling interest balance |  |  |  |  |  |  |  | $ 128 |  |  |  |
Percentage of direct/indirect interest in capital stock and votes |  |  |  |  |  |  | 67.50% |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  | 67.50% |  |  |  |  |
AVC Continente Audiovisual |  |  |  |  |  |  |  |  |  |  |  |
Control |  |  |  |  |  |  |  |  |  |  |  |
Number of holders offered option | shares |  |  |  |  |  |  |  |  |  | 497,479 | 497,479 |
Par value (in argentine peso per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 1 |
Percentage of holders offered option |  |  |  |  |  |  |  |  |  | 40.00% | 40.00% |
Option premium payable upon exercise of option |  |  |  |  |  |  |  |  |  | $ 720,000 | $ 45,536 |
Option premium payable, cable TV subscription fees | item |  |  |  |  |  |  | 22,768 |  |  |  |  |
Option premium owed |  |  |  |  |  |  | $ 39,000,000 |  |  |  |  |
Percentage of direct/indirect interest in capital stock and votes |  |  |  |  |  |  | 60.00% |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  | 60.00% |  |  |  |  |
Micro Sistemas |  |  |  |  |  |  |  |  |  |  |  |
Control |  |  |  |  |  |  |  |  |  |  |  |
Par value (in argentine peso per share) | $ / shares | $ 1 |  |  | $ 1 |  |  |  |  |  |  |  |
Voting right per share | 1 |  |  | 1 |  |  |  |  |  |  |  |
Percentage of direct/indirect interest in capital stock and votes |  |  |  |  |  |  | 100.00% |  |  |  |  |
Irrevocable contribution paid in cash |  | $ 62 |  |  | $ 60 |  |  |  |  |  |  |
Investments in subsidiaries | $ 62 |  |  | $ 60 |  |  |  |  |  |  |  |
Increase in number of shares outstanding | shares | 62,000,000 |  |  | 60,000,000 |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  | 100.00% |  |  |  |  |
Personal Smarthome |  |  |  |  |  |  |  |  |  |  |  |
Control |  |  |  |  |  |  |  |  |  |  |  |
Par value (in argentine peso per share) | $ / shares |  |  | $ 1 |  |  |  |  |  |  |  |  |
Voting right per share |  |  | 5 |  |  |  |  |  |  |  |  |
Percentage of direct/indirect interest in capital stock and votes |  |  |  |  |  |  | 100.00% |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  | 100.00% |  |  |  |  |
Shareholders paid in cash (as a percentage) |  |  | 25.00% |  |  |  |  |  |  |  |  |
Personal Smarthome | Telecom Argentina |  |  |  |  |  |  |  |  |  |  |  |
Control |  |  |  |  |  |  |  |  |  |  |  |
Percentage of direct/indirect interest in capital stock and votes |  |  | 90.00% |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 90.00% |  |  |  |  |  |  |  |  |
Outstanding shares | shares |  |  | 90,000 |  |  |  |  |  |  |  |  |
Personal Smarthome | PEM |  |  |  |  |  |  |  |  |  |  |  |
Control |  |  |  |  |  |  |  |  |  |  |  |
Percentage of direct/indirect interest in capital stock and votes |  |  | 10.00% |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 10.00% |  |  |  |  |  |  |  |  |
Outstanding shares | shares |  |  | 10,000 |  |  |  |  |  |  |  |  |
Other deferred | Tuves Paraguay |  |  |  |  |  |  |  |  |  |  |  |
Control |  |  |  |  |  |  |  |  |  |  |  |
Increase in Tuves shareholding |  |  |  |  |  |  |  | $ 46 |  |  |  |
PEM |  |  |  |  |  |  |  |  |  |  |  |
Control |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  | 0.00001% |  |  |  |  |  |
Par value (in argentine peso per share) | $ / shares |  |  |  |  |  | $ 1 |  |  |  |  |  |
Voting right per share |  |  |  |  |  | 1 |  |  |  |  |  |
Total purchase price |  |  |  |  |  | $ 10,000 |  |  |  |  |  |
Percentage of direct/indirect interest in capital stock and votes |  |  |  |  |  | 100.00% |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  | 100.00% |  |  |  |  |  |

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