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CASH AND CASH EQUIVALENTS AND INVESTMENTS. ADDITIONAL INFORMATION ON THE CONSOLIDATED STATEMENTS OF CASH FLOWS - Cash dividends (Details) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 ARS ($) | Apr. 30, 2018 ARS ($) | Mar. 21, 2018 ARS ($) | Feb. 15, 2018 ARS ($) | Jan. 08, 2018 ARS ($) | Mar. 30, 2017 ARS ($) installment | Jun. 30, 2018 ARS ($) | May 31, 2018 ARS ($) | Jun. 30, 2017 ARS ($) | Jun. 30, 2018 ARS ($) | Jun. 30, 2017 ARS ($) | Sep. 30, 2017 ARS ($) | Dec. 31, 2018 ARS ($) | Dec. 31, 2017 ARS ($) installment | Dec. 31, 2016 ARS ($) | Aug. 31, 2017 ARS ($) | May 31, 2017 ARS ($) | Feb. 28, 2017 ARS ($)
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  |  |  |  |  |  |  |  | $ 28,822,000,000 | [1] | $ 2,770,000,000 | [2] | $ 1,563,000,000 | [3] |  |  |
Payment of cash dividend |  |  |  |  |  |  |  |  |  |  |  |  | 34,130,000,000 |  | 2,454,000,000 |  | $ 3,005,000,000 |  |  |  |
Offsetting of dividends receivable with financial debt |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  | 12,000,000 |  |  |  |  |  |
Telecom Argentina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve for future cash dividends payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,729,418,019 |  |  |  |  |  |
Number of cash dividend distribution installments | installment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Cash dividend paid to equityholders of parent |  | $ 6,866,418,019 |  | $ 2,863,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advance cash dividends paid |  |  |  |  |  |  |  |  |  |  |  | $ 5,640,728,444 |  |  |  |  |  |  |  |  |
Interim cash dividends paid |  |  |  |  |  |  |  |  |  |  |  | $ 4,502,777,155 |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  |  |  |  |  |  |  |  | 19,873,000,000 |  |  |  |  |  |  |  |
Payment of cash dividend |  |  | $ 6,866,000,000 | 13,007,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telecom Argentina | Current currency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  | $ 28,822,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of cash dividend |  |  | $ 27,927,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Associates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends received |  |  |  |  |  |  |  |  |  |  |  |  | 41,000,000 |  | $ 99,000,000 |  |  |  |  |  |
Associates | Current currency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends received |  |  |  |  |  |  |  |  |  |  |  |  | 56,000,000 |  | 149,000,000 |  |  |  |  |  |
Ver T.V. S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends received |  |  |  |  |  |  |  |  |  | $ 19,000,000 |  |  |  |  | 32,000,000 |  |  |  |  |  |
Dividends approved |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 198,000,000 |  |  |  |  |  | $ 77,000,000
Ver T.V. S.A. | Telecom Argentina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends approved |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 97,000,000 |  |  |  |  |  |
Teledifusora San Miguel Arcngel S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends received |  |  |  |  |  |  |  |  |  | $ 8,000,000 |  |  |  |  | $ 7,000,000 |  |  |  |  |  |
Dividends approved |  |  |  |  |  |  |  |  | $ 24,000,000 |  | $ 24,000,000 |  |  |  |  |  |  |  | $ 69,000,000 |  |
Teledifusora San Miguel Arcngel S.A. | Telecom Argentina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends approved |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 34,000,000 |  |
La Capital Cable S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends received |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends approved |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,000,000 |
Offsetting of dividends receivable with financial debt |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cablevision S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cash dividend distribution installments | installment |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends approved | $ 2,603,000,000 |  |  |  |  | $ 1,600,000,000 |  |  |  |  |  |  | 2,603,000,000 |  |  |  |  |  |  |  |
Cablevision S.A. | Telecom Argentina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid |  |  |  |  | $ 4,077,790,056 |  |  |  |  |  |  |  | $ 6,021,000,000 |  |  |  |  |  |  |  |
Dividends payable per installment |  |  |  |  |  | $ 800,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cablevision S.A. | Ver T.V. S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends approved |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,000,000
Cablevision S.A. | Teledifusora San Miguel Arcngel S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends approved |  |  |  |  |  |  |  |  | 12,000,000 |  | 12,000,000 |  |  |  |  |  |  |  |  |  |
Cablevision S.A. | La Capital Cable S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends approved |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |
Offsetting of dividends receivable with financial debt |  |  |  |  |  |  |  |  | $ 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Nucleo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid | $ 182,000,000 |  |  |  |  |  |  | $ 161,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
CV Berazategui |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid |  |  |  |  |  |  |  |  |  |  | $ 6,000,000 |  |  |  |  |  |  |  |  |  |
[1] | As approved by the Company’s Board of Directors on January 31, 2018. Includes 14,711 of advanced dividends which were subsequently ratified by the General Ordinary Shareholders’ Meeting held on April 25, 2018.
[2] | As approved by the Ordinary and Extraordinary Shareholders’ Meeting of Cablevisión held on March 30, 2017.
[3] | As approved by the General Ordinary and Extraordinary Shareholders’ Meeting of Cablevisión held on April 20, 2016.

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