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ACQUISITION OF COMPANIES AND CORPORATE REORGANIZATION PROCESSES - Merger of Cablevision (Details) | Dec. 28, 2018 shares | Dec. 29, 2017 shares | Jul. 07, 2017 USD ($) | Dec. 31, 2018 ARS ($) shares | Jun. 29, 2018 item | Jan. 01, 2018 shares | Dec. 31, 2017 | Dec. 27, 2017 USD ($) | Oct. 05, 2017 USD ($) | Jun. 30, 2017 ARS ($)
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Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Outstanding Shares (in shares) |  |  |  |  |  | 2,153,688,011 |  |  |  |
Treasury shares |  |  |  |  |  | 15,221,373 |  |  |  |
Total Capital Stock (in shares) |  |  |  | 2,168,909,384 |  |  |  |  |  |
Class A Shares |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Outstanding Shares (in shares) |  |  |  |  |  | 683,856,600 |  |  |  |
Total Capital Stock (in shares) |  |  |  | 683,856,600 |  |  |  |  |  |
Class B shares |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Outstanding Shares (in shares) |  |  |  |  |  | 627,953,887 |  |  |  |
Treasury shares |  |  |  |  |  | 15,221,373 |  |  |  |
Total Capital Stock (in shares) |  |  |  | 643,175,260 |  |  |  |  |  |
Class C shares |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Outstanding Shares (in shares) |  |  |  |  |  | 210,866 |  |  |  |
Total Capital Stock (in shares) |  |  |  | 210,866 |  |  |  |  |  |
Class D shares |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Outstanding Shares (in shares) |  |  |  |  |  | 841,666,658 |  |  |  |
Total Capital Stock (in shares) |  |  |  | 841,666,658 |  |  |  |  |  |
Cablevision S.A. |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Shares issued or transferred (in shares) | $ |  |  |  | 193,831,921 |  |  |  |  |  | 9,871.07005
Total purchase price | $ |  |  |  | $ 194,435,000,000 |  |  |  |  |  |
VLG S.A.U | Class D shares |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Shares issued upon merger (in shares) |  | 434,909,475 |  |  |  |  |  |  |  |
Fintech Telecom | Class A Shares |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Shares issued upon merger (in shares) |  | 342,861,748 |  |  |  |  |  |  |  |
Cablevision Holding S.A. | Class D shares |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Shares issued upon merger (in shares) |  | 406,757,183 |  |  |  |  |  |  |  |
Cablevision Holding S.A. | Fintech Advisory Inc. |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Term for payment of option premium (in days) |  |  | 30 days |  |  |  |  |  |  |
Cablevision Holding S.A. |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Percentage of interest on stake |  |  |  |  |  |  | 100.00% |  |  |
Cablevision Holding S.A. | Class B shares |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Conversion of ordinary shares | 23,882 |  |  |  |  |  |  |  |  |
Cablevision Holding S.A. | Telecom Argentina |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Capital stock post-merger (as a percent) |  |  | 6.00% |  |  |  |  |  | 6.00% |
Total purchase price | $ |  |  |  |  |  |  |  | $ 628,008,363 | $ 634,275,282 |
Number of residential subscriber of internet service | item |  |  |  |  | 143,464 |  |  |  |  |
Cablevision Holding S.A. | Telecom Argentina | Fintech Advisory Inc. |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Percentage of interest on stake |  |  | 13.51% |  |  |  |  |  |  |
Total purchase price | $ |  |  | $ 634,275,282 |  |  |  |  |  |  |
Option premium | $ |  |  | $ 3,000,000 |  |  |  |  |  |  |
Cablevision Holding S.A. | Telecom Argentina | Fintech Advisory Inc. | Maximum |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Term for exercise of option (in years) |  |  | 1 year |  |  |  |  |  |  |
Cablevision Holding S.A. | VLG S.A.U |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Percentage of interest on stake |  |  |  |  |  |  |  |  | 21.55% |

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