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SIGNIFICANT ACCOUNTING POLICIES - Control (Details) $ / shares in Units, $ / shares in Units, $ in Millions, $ in Millions |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 27, 2019 ARS ($) Vote $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2019 ARS ($) shares | Dec. 31, 2018 ARS ($) $ / shares | Dec. 31, 2019 $ / shares | Sep. 30, 2019 $ / shares | Sep. 25, 2019 USD ($) shares | Sep. 25, 2019 ARS ($) $ / shares shares | Jun. 30, 2019 $ / shares | May 10, 2019 USD ($) Vote shares | May 10, 2019 ARS ($) Vote shares
Control |  |  |  |  |  |  |  |  |  |  |
Net Equity attributable to controlling shareholders |  |  |  | $ (376) |  |  |  |  |  |  |
Par value (in argentine peso per share) | $ / shares |  |  |  | $ 1 | $ 1 | $ 1 |  |  | $ 1 |  |
Tuves Paraguay |  |  |  |  |  |  |  |  |  |  |
Control |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  |  |  |  | 30.00% | 30.00%
Price per share | $ / shares |  | $ 4.72 |  |  |  |  |  |  |  |  |
Percentage of direct/indirect interest in capital stock and votes |  |  | 67.50% |  |  |  |  |  |  |  |
Tuves Paraguay | Telecom Argentina |  |  |  |  |  |  |  |  |  |  |
Control |  |  |  |  |  |  |  |  |  |  |
Number of shares acquired | shares |  |  | 2 |  |  |  |  |  |  |  |
Tuves Paraguay | ABC Telecomunicaciones |  |  |  |  |  |  |  |  |  |  |
Control |  |  |  |  |  |  |  |  |  |  |
Number of shares acquired | shares |  |  | 1 |  |  |  |  |  |  |  |
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 | $ 45,536 |  |  |
Option premium payable, average cable TV subscription fees |  |  |  |  |  |  |  | $ 114 |  |  |
Option premium paid |  | $ 720 |  |  |  |  |  |  |  |  |
Percentage of direct/indirect interest in capital stock and votes |  |  | 60.00% |  |  |  |  |  |  |  |
Series B registered common share | Common stock | Tuves Paraguay |  |  |  |  |  |  |  |  |  |  |
Control |  |  |  |  |  |  |  |  |  |  |
Shares can be purchased per agreement | shares |  |  |  |  |  |  |  |  |  | 211,848 | 211,848
Voting right per share | Vote |  |  |  |  |  |  |  |  |  | 1 | 1
Capital stock and votes of Subsidiaries |  |  |  |  |  |  |  |  |  | $ 1 | $ 54
Net Equity attributable to controlling shareholders |  |  | $ 94 |  |  |  |  |  |  |  |
Other deferred | Series B registered common share | Common stock | Tuves Paraguay |  |  |  |  |  |  |  |  |  |  |
Control |  |  |  |  |  |  |  |  |  |  |
Net Equity attributable to controlling shareholders |  |  | $ 34 |  |  |  |  |  |  |  |
PEM |  |  |  |  |  |  |  |  |  |  |
Control |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired | 0.00001% |  |  |  |  |  |  |  |  |  |
Voting right per share | Vote | 1 |  |  |  |  |  |  |  |  |  |
Par value (in argentine peso per share) | $ / shares | $ 1 |  |  |  |  |  |  |  |  |  |
Total purchase price | $ 10,000 |  |  |  |  |  |  |  |  |  |
Percentage of direct/indirect interest in capital stock and votes | 100.00% |  |  |  |  |  |  |  |  |  |

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