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COMMON STOCK AND DIVIDENDS, Dividends distribution and Treasury shares distribution (Details) - ARS ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended |  |
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Nov. 13, 2019 | Oct. 17, 2019 | Apr. 11, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | [1] | Dec. 31, 2016 | [1]
Treasury shares distribution [Abstract] |  |  |  |  |  |  |  |  |  |
Shareholders' equity |  |  |  |  | $ 48,083,469 |  | $ 47,603,906 |  | $ 38,888,199 | $ 30,041,011
Decrease in treasury shares equity transaction |  |  |  |  | $ (2,590,658) |  | $ (2,185,845) |  |  |
Treasury Shares [Member] |  |  |  |  |  |  |  |  |  |
Treasury shares distribution [Abstract] |  |  |  |  |  |  |  |  |  |
Distribution of ordinary shares (in pesos per share) |  | $ 0.0385 |  |  |  |  |  |  |  |
Distribution of shares per American Depositary Receipt (ADR) (in pesos per share) |  | $ 0.192 |  |  |  |  |  |  |  |
Percentage of share capital |  | 3.706% |  |  | 1.24% |  | 1.71% |  |  |
Shareholders' equity |  | $ 794,495 |  |  |  |  |  |  |  |
Market value of treasury shares |  | 3,228,002 |  |  |  |  |  |  |  |
Acquisition cost of treasury shares |  | 4,045,739 |  |  | $ 730,764 |  | $ 2,185,845 |  |  |
Additional Paid-up capital [member] |  |  |  |  |  |  |  |  |  |
Treasury shares distribution [Abstract] |  |  |  |  |  |  |  |  |  |
Shareholders' equity | [2] |  |  |  | (791,712) |  | 0 |  | $ 0 | $ 0
Decrease in treasury shares equity transaction |  | 791,712 |  |  | $ 0 | [2] | $ 0 | [2] |  |
Director [Member] |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  | $ 318,732 |  |  |  |  |  |
Cash dividends (in pesos per share) |  |  |  | $ 0.4083 |  |  |  |  |  |
Shareholders [Member] |  |  |  |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |  |  |  |
Cash dividends |  | $ 256,338 |  | $ 9,185,584 |  |  |  |  |  |
Cash dividends (in pesos per share) |  | $ 0.3351 |  | $ 11.7671 |  |  |  |  |  |
Class "B" [Member] | Treasury Shares [Member] |  |  |  |  |  |  |  |  |  |
Treasury shares distribution [Abstract] |  |  |  |  |  |  |  |  |  |
Number of treasury shares in portfolio (in shares) |  |  | 29,444,795 |  |  |  |  |  |  |
[1] | The Company has applied IFRS 15 and IFRS 9 for the first time on January 1, 2018. In accordance with the transition methods chosen, the comparative information has not been modified. See Note 4.a)
[2] | As of December 31, 2019 and 2018 corresponds to 9,886,755 and 13,600,780 shares of par value Ps. 1 each, equivalent to 1.24% and 1,71% of the share capital, respectively. The acquisition cost of these shares amounted to Ps. 730,764 and 2,185,845, respectively. See Note 19.b) to the consolidated financial statements.

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