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INTANGIBLE ASSETS - Accumulated Amortization (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Intangible assets    
Value, at the beginning of the year $ 91,474  
Value, at the end of the year 82,608 $ 91,474
Intangible assets other than goodwill    
Intangible assets 82,608 91,474
Accumulated depreciation and amortization    
Intangible assets    
Value, at the beginning of the year (9,005) (1,566)
Amortization (8,269) (8,181)
Currency translation adjustments (45) (18)
Decreases 1,823 760
Value, at the end of the year (15,496) (9,005)
Intangible assets other than goodwill    
Intangible assets (15,496) (9,005)
Accumulated depreciation and amortization | 3G/4G licenses    
Intangible assets    
Value, at the beginning of the year (1,950) (111)
Amortization (2,338) (1,839)
Value, at the end of the year (4,288) (1,950)
Intangible assets other than goodwill    
Intangible assets (4,288) (1,950)
Accumulated depreciation and amortization | Nucleo's licenses    
Intangible assets    
Value, at the beginning of the year (113)  
Amortization (138) (107)
Currency translation adjustments (28) (6)
Value, at the end of the year (279) (113)
Intangible assets other than goodwill    
Intangible assets (279) (113)
Accumulated depreciation and amortization | Customer relationships    
Intangible assets    
Value, at the beginning of the year (4,728)  
Amortization (4,016) (5,500)
Currency translation adjustments (16) 12
Decreases 1,775 760
Value, at the end of the year (6,985) (4,728)
Intangible assets other than goodwill    
Intangible assets (6,985) (4,728)
Accumulated depreciation and amortization | Brands    
Intangible assets    
Value, at the beginning of the year (144) (137)
Amortization (8) (7)
Value, at the end of the year (152) (144)
Intangible assets other than goodwill    
Intangible assets (152) (144)
Accumulated depreciation and amortization | Incremental Cost from the acquisition of contracts    
Intangible assets    
Value, at the beginning of the year (604)  
Amortization (1,511) (580)
Currency translation adjustments   (24)
Value, at the end of the year (2,115) (604)
Intangible assets other than goodwill    
Intangible assets (2,115) (604)
Accumulated depreciation and amortization | Other    
Intangible assets    
Value, at the beginning of the year (1,466) (1,318)
Amortization (258) (148)
Currency translation adjustments (1)  
Decreases 48  
Value, at the end of the year (1,677) (1,466)
Intangible assets other than goodwill    
Intangible assets (1,677) (1,466)
Net carrying value before impairment    
Intangible assets    
Value, at the beginning of the year 93,972  
Value, at the end of the year 87,249 93,972
Intangible assets other than goodwill    
Intangible assets 87,249 93,972
Net carrying value before impairment | 3G/4G licenses    
Intangible assets    
Value, at the beginning of the year 32,243  
Value, at the end of the year 29,915 32,243
Intangible assets other than goodwill    
Intangible assets 29,915 32,243
Net carrying value before impairment | PCS license (Argentina)    
Intangible assets    
Value, at the beginning of the year 16,211  
Value, at the end of the year 16,211 16,211
Intangible assets other than goodwill    
Intangible assets 16,211 16,211
Net carrying value before impairment | Nucleo's licenses    
Intangible assets    
Value, at the beginning of the year 3,884  
Value, at the end of the year 3,697 3,884
Intangible assets other than goodwill    
Intangible assets 3,697 3,884
Net carrying value before impairment | Customer relationships    
Intangible assets    
Value, at the beginning of the year 18,709  
Value, at the end of the year 14,682 18,709
Intangible assets other than goodwill    
Intangible assets 14,682 18,709
Net carrying value before impairment | Brands    
Intangible assets    
Value, at the beginning of the year 20,284  
Value, at the end of the year 20,276 20,284
Intangible assets other than goodwill    
Intangible assets 20,276 20,284
Net carrying value before impairment | Incremental Cost from the acquisition of contracts    
Intangible assets    
Value, at the beginning of the year 1,480  
Value, at the end of the year 1,573 1,480
Intangible assets other than goodwill    
Intangible assets 1,573 1,480
Net carrying value before impairment | Other    
Intangible assets    
Value, at the beginning of the year 1,161  
Value, at the end of the year 895 1,161
Intangible assets other than goodwill    
Intangible assets $ 895 $ 1,161