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SIGNIFICANT ACCOUNTING POLICIES - Adoption of IFRS 15 (Revenue from Contracts with Customers) (Details) - ARS ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Adoption of IFRS 15 (Revenue from Contracts with Customers) |  |  |  |
Total deferred income tax liabilities, net |  | $ 24,464 | $ 3,916 |
Revenues |  | 168,046 | 66,649 | $ 60,405
Net income |  | $ 5,536 | $ 9,859 | $ 10,546
Basic and diluted (in dollars per share) |  | $ 2.46 | $ 8.21 | $ 8.83
Income tax expense |  | $ (2,838) | $ 5,516 | $ 6,015
Cost of equipment and handsets |  | 9,608 | 285 | 1,341
Adoption of IFRS 15 |  |  |  |
Adoption of IFRS 15 (Revenue from Contracts with Customers) |  |  |  |
Retained earnings | $ (90) |  |  |
Contractual assets |  | 85 |  |
Total deferred income tax liabilities, net |  | 32 |  |
Revenues |  | 105 |  |
Net income |  | $ 73 |  |
Basic and diluted (in dollars per share) |  | $ 0.02 |  |
Retained earnings, before income tax | 125 |  |  |
Income tax expense | 35 |  |  |
Cost of equipment and handsets |  | $ 145 |  |
Amortization of equipment and handsets |  | (143) |  |
Income (loss) before tax on adoption of IFRS 15 on equipment and handsets |  | 2 |  |
Tax expense (benefit) on adoption of IFRS 15 on equipment and handsets |  | (1) |  |
Income (loss), net of tax on adoption of IFRS 15 on equipment and handsets |  | 1 |  |
Adoption of IFRS 15 | Equipment |  |  |  |
Adoption of IFRS 15 (Revenue from Contracts with Customers) |  |  |  |
Revenues |  | 588 |  |
Adoption of IFRS 15 | Services |  |  |  |
Adoption of IFRS 15 (Revenue from Contracts with Customers) |  |  |  |
Revenues |  | (483) |  |
Telecom Argentina | Adoption of IFRS 15 |  |  |  |
Adoption of IFRS 15 (Revenue from Contracts with Customers) |  |  |  |
Retained earnings | 808 |  |  |
Contractual assets | 1,153 |  |  |
Total deferred income tax liabilities, net | 345 |  |  |
Equity attributable to Controlling Company |  |  |  |
Adoption of IFRS 15 (Revenue from Contracts with Customers) |  |  |  |
Net income |  | 5,294 | 9,731 | 10,457
Equity attributable to Controlling Company | Adoption of IFRS 15 |  |  |  |
Adoption of IFRS 15 (Revenue from Contracts with Customers) |  |  |  |
Retained earnings | 83 |  |  |
Retained earnings, before income tax | 117 |  |  |
Income tax expense | 34 |  |  |
Equity attributable to non-controlling interest |  |  |  |
Adoption of IFRS 15 (Revenue from Contracts with Customers) |  |  |  |
Net income |  | $ 242 | $ 128 | $ 89
Equity attributable to non-controlling interest | Adoption of IFRS 15 |  |  |  |
Adoption of IFRS 15 (Revenue from Contracts with Customers) |  |  |  |
Retained earnings | 7 |  |  |
Retained earnings, before income tax | 8 |  |  |
Income tax expense | $ 1 |  |  |

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