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PROPERTY, PLANT AND EQUIPMENT - Property, plant and equipment - Gross (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of changes in property, plant and equipment    
Property, plant and equipment at beginning of year $ 45,701  
Property, plant and equipment at end of year 150,476 $ 45,701
Gross carrying value    
Reconciliation of changes in property, plant and equipment    
Property, plant and equipment at beginning of year 45,885  
Property, plant and equipment at end of year 151,168 45,885
PP&E | Gross carrying value    
Reconciliation of changes in property, plant and equipment    
Property, plant and equipment at beginning of year 71,967 60,864
Incorporation by merger 92,636  
CAPEX 39,574 19,116
Currency translation adjustments 4,786 (201)
Decreases (7,718) (7,812)
Property, plant and equipment at end of year 201,245 71,967
Real estate | Gross carrying value    
Reconciliation of changes in property, plant and equipment    
Property, plant and equipment at beginning of year 2,990 2,864
Incorporation by merger 19,387  
CAPEX 6 227
Currency translation adjustments 167 (2)
Transfers and reclassifications 219 22
Decreases (9) (121)
Property, plant and equipment at end of year 22,760 2,990
Switching equipment | Gross carrying value    
Reconciliation of changes in property, plant and equipment    
Incorporation by merger 3,700  
CAPEX 223  
Currency translation adjustments 798  
Transfers and reclassifications 384  
Decreases (2)  
Property, plant and equipment at end of year 5,103  
Fixed network and transportation | Gross carrying value    
Reconciliation of changes in property, plant and equipment    
Property, plant and equipment at beginning of year 35,676 30,317
Incorporation by merger 30,493  
CAPEX 5,408 4,027
Currency translation adjustments 674 (177)
Transfers and reclassifications 15,187 4,793
Decreases (3,840) (3,284)
Property, plant and equipment at end of year 83,598 35,676
Mobile network access | Gross carrying value    
Reconciliation of changes in property, plant and equipment    
Property, plant and equipment at beginning of year 4 3
Incorporation by merger 11,317  
CAPEX 12 1
Currency translation adjustments 836  
Transfers and reclassifications 4,825  
Decreases (312)  
Property, plant and equipment at end of year 16,682 4
Tower and pole | Gross carrying value    
Reconciliation of changes in property, plant and equipment    
Property, plant and equipment at beginning of year 207 208
Incorporation by merger 4,494  
CAPEX 43  
Currency translation adjustments 273  
Transfers and reclassifications 384  
Decreases (3) (1)
Property, plant and equipment at end of year 5,398 207
Power equipment and Installations | Gross carrying value    
Reconciliation of changes in property, plant and equipment    
Incorporation by merger 5,472  
Currency translation adjustments 233  
Transfers and reclassifications 705  
Property, plant and equipment at end of year 6,410  
Computer equipment | Gross carrying value    
Reconciliation of changes in property, plant and equipment    
Property, plant and equipment at beginning of year 4,767 3,577
Incorporation by merger 6,264  
CAPEX 1,158 574
Currency translation adjustments 1,249 (4)
Transfers and reclassifications 2,211 616
Decreases (4) 4
Property, plant and equipment at end of year 15,645 4,767
Goods lent to customers at no cost | Gross carrying value    
Reconciliation of changes in property, plant and equipment    
Property, plant and equipment at beginning of year 5,282 4,035
Incorporation by merger 223  
CAPEX 5,010 845
Currency translation adjustments 361  
Transfers and reclassifications 4 3,192
Decreases (3,396) (2,790)
Property, plant and equipment at end of year 7,484 5,282
Vehicles | Gross carrying value    
Reconciliation of changes in property, plant and equipment    
Property, plant and equipment at beginning of year 1,477 1,384
Incorporation by merger 1,187  
CAPEX 376 195
Currency translation adjustments 21 (1)
Transfers and reclassifications   2
Decreases (74) (103)
Property, plant and equipment at end of year 2,987 1,477
Machinery, diverse equipment and tools | Gross carrying value    
Reconciliation of changes in property, plant and equipment    
Property, plant and equipment at beginning of year 3,946 3,805
Incorporation by merger 226  
CAPEX 194 22
Currency translation adjustments 12 (2)
Transfers and reclassifications 98 120
Decreases   1
Property, plant and equipment at end of year 4,476 3,946
Other | Gross carrying value    
Reconciliation of changes in property, plant and equipment    
Property, plant and equipment at beginning of year 259 260
Incorporation by merger 473  
CAPEX 5 4
Currency translation adjustments 42 (6)
Transfers and reclassifications 83 1
Decreases 1  
Property, plant and equipment at end of year 863 259
Construction in progress | Gross carrying value    
Reconciliation of changes in property, plant and equipment    
Property, plant and equipment at beginning of year 10,377 6,879
Incorporation by merger 5,818  
CAPEX 24,138 2,169
Currency translation adjustments 95  
Transfers and reclassifications (23,144) 1,329
Decreases (38)  
Property, plant and equipment at end of year 17,246 10,377
Materials | Gross carrying value    
Reconciliation of changes in property, plant and equipment    
Property, plant and equipment at beginning of year 6,982 7,532
Incorporation by merger 3,582  
CAPEX 3,001 11,052
Currency translation adjustments 25 (9)
Transfers and reclassifications (956) (10,075)
Decreases (41) (1,518)
Property, plant and equipment at end of year $ 12,593 $ 6,982