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ACQUISITION OF COMPANIES AND CORPORATE REORGANIZATION PROCESSES - Corporate Reorganization of the Telecom Group (Details) | Dec. 31, 2018 $ / shares | Dec. 31, 2017 $ / shares | May 23, 2017 Vote $ / shares shares | May 22, 2017 | Dec. 31, 2016 $ / shares
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ACQUISITION OF COMPANIES AND CORPORATE REORGANIZATION PROCESSES |  |  |  |  |
Nominal value (in pesos per share) | $ 1 | $ 10,000 |  |  | $ 10,000
Sofora |  |  |  |  |
ACQUISITION OF COMPANIES AND CORPORATE REORGANIZATION PROCESSES |  |  |  |  |
Nominal value (in pesos per share) | $ 1 |  |  |  |
Telecom Argentina | Sofora | WAI |  |  |  |  |
ACQUISITION OF COMPANIES AND CORPORATE REORGANIZATION PROCESSES |  |  |  |  |
Shares owned of capital stock (as a percent) |  |  |  | 15.00% |
Class A Shares | Telecom Argentina |  |  |  |  |
ACQUISITION OF COMPANIES AND CORPORATE REORGANIZATION PROCESSES |  |  |  |  |
Number of shares to be converted | shares |  |  | 161,039,447 |  |
Nominal value (in pesos per share) |  |  | $ 1 |  |
Number of vote per share | Vote |  |  | 1 |  |
Class B shares | Telecom Argentina |  |  |  |  |
ACQUISITION OF COMPANIES AND CORPORATE REORGANIZATION PROCESSES |  |  |  |  |
Nominal value (in pesos per share) |  |  | $ 1 |  |
Number of vote per share | Vote |  |  | 1 |  |
Number of converted shares to be issued to Class B Preferred Shareholders | shares |  |  | 161,039,477 |  |

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