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INTANGIBLE ASSETS - Accumulated Amortization (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Intangible assets    
Value, at the beginning of the year $ 4,635  
Value, at the end of the year 59,870 $ 4,635
Intangible assets other than goodwill    
Intangible assets 4,635 4,635
Accumulated depreciation and amortization    
Intangible assets    
Value, at the beginning of the year (1,018) (912)
Amortization (5,378) (106)
Currency translation adjustments (11)  
Decreases 494  
Value, at the end of the year (5,913) (1,018)
Intangible assets other than goodwill    
Intangible assets (1,018) (912)
Accumulated depreciation and amortization | 3G/4G licenses    
Intangible assets    
Amortization (1,196)  
Value, at the end of the year (1,196)  
Intangible assets other than goodwill    
Intangible assets (1,196)  
Accumulated depreciation and amortization | Nucleo's licenses    
Intangible assets    
Amortization (70)  
Currency translation adjustments (4)  
Value, at the end of the year (74)  
Intangible assets other than goodwill    
Intangible assets (74)  
Accumulated depreciation and amortization | SRCE license    
Intangible assets    
Value, at the beginning of the year (72) (57)
Amortization   (15)
Value, at the end of the year (72) (72)
Intangible assets other than goodwill    
Intangible assets (72) (57)
Accumulated depreciation and amortization | Customer relationships    
Intangible assets    
Amortization (3,574)  
Currency translation adjustments 8  
Decreases 494  
Value, at the end of the year (3,072)  
Intangible assets other than goodwill    
Intangible assets (3,072)  
Accumulated depreciation and amortization | Brands    
Intangible assets    
Value, at the beginning of the year (89) (83)
Amortization (5) (6)
Value, at the end of the year (94) (89)
Intangible assets other than goodwill    
Intangible assets (89) (83)
Accumulated depreciation and amortization | Incremental Cost from the acquisition of contracts    
Intangible assets    
Amortization (378)  
Currency translation adjustments (15)  
Value, at the end of the year (393)  
Intangible assets other than goodwill    
Intangible assets (393)  
Accumulated depreciation and amortization | Other    
Intangible assets    
Value, at the beginning of the year (857) (772)
Amortization (155) (85)
Value, at the end of the year (1,012) (857)
Intangible assets other than goodwill    
Intangible assets (857) (772)
Net carrying value before impairment    
Intangible assets    
Value, at the beginning of the year 4,635  
Value, at the end of the year 61,493 4,635
Intangible assets other than goodwill    
Intangible assets 4,635 4,635
Net carrying value before impairment | 3G/4G licenses    
Intangible assets    
Value, at the beginning of the year 3,635  
Value, at the end of the year 20,152 3,635
Intangible assets other than goodwill    
Intangible assets 3,635 3,635
Net carrying value before impairment | PCS license (Argentina)    
Intangible assets    
Value, at the end of the year 10,538  
Intangible assets other than goodwill    
Intangible assets 10,538  
Net carrying value before impairment | Nucleo's licenses    
Intangible assets    
Value, at the end of the year 803  
Intangible assets other than goodwill    
Intangible assets 803  
Net carrying value before impairment | SRCE license    
Intangible assets    
Value, at the beginning of the year 807  
Value, at the end of the year 807 807
Intangible assets other than goodwill    
Intangible assets 807 807
Net carrying value before impairment | Customer relationships    
Intangible assets    
Value, at the end of the year 12,163  
Intangible assets other than goodwill    
Intangible assets 12,163  
Net carrying value before impairment | Brands    
Intangible assets    
Value, at the beginning of the year 160  
Value, at the end of the year 13,185 160
Intangible assets other than goodwill    
Intangible assets 160 160
Net carrying value before impairment | Incremental Cost from the acquisition of contracts    
Intangible assets    
Value, at the end of the year 962  
Intangible assets other than goodwill    
Intangible assets 962  
Net carrying value before impairment | Other    
Intangible assets    
Value, at the beginning of the year 33  
Value, at the end of the year 2,883 33
Intangible assets other than goodwill    
Intangible assets $ 33 $ 33