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Intangible assets - Accumulated Amortization (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Intangible assets    
Value, at the beginning of the year $ 7,592 $ 7,659
Value, at the end of the year 7,098 7,592
SAC | Fixed services    
Intangible assets    
Value, at the beginning of the year 96  
Value, at the end of the year 77 96
SAC | Mobile Services    
Intangible assets    
Value, at the beginning of the year 1,427  
Value, at the end of the year 1,140 1,427
Service connection or habilitation costs    
Intangible assets    
Value, at the beginning of the year 119  
Value, at the end of the year 136 119
3G/4G licenses    
Intangible assets    
Value, at the beginning of the year 5,105  
Value, at the end of the year 4,780 5,105
PCS license (Argentina)    
Intangible assets    
Value, at the beginning of the year 588  
Value, at the end of the year 588 588
PCS and Band B (Paraguay)    
Intangible assets    
Value, at the end of the year 3  
Rights of use    
Intangible assets    
Value, at the beginning of the year 244  
Value, at the end of the year 226 244
Exclusivity agreements    
Intangible assets    
Value, at the beginning of the year 12  
Value, at the end of the year 11 12
Customer relationships    
Intangible assets    
Value, at the beginning of the year 1  
Value, at the end of the year 135 1
Goodwill    
Intangible assets    
Value, at the end of the year 2  
Accumulated depreciation and amortization    
Intangible assets    
Value, at the beginning of the year (4,196) (3,192)
Acquisition Tuves Paraguay (49)  
Amortization (1,889) (1,840)
Currency translation adjustments (272) (229)
Decreases 1,523 1,065
Value, at the end of the year (4,883) (4,196)
Accumulated depreciation and amortization | SAC | Fixed services    
Intangible assets    
Value, at the beginning of the year (130) (118)
Amortization (106) (157)
Decreases 169 145
Value, at the end of the year (67) (130)
Accumulated depreciation and amortization | SAC | Mobile Services    
Intangible assets    
Value, at the beginning of the year (1,411) (1,001)
Acquisition Tuves Paraguay (47)  
Amortization (1,385) (1,288)
Currency translation adjustments (26) (15)
Decreases 1,295 893
Value, at the end of the year (1,574) (1,411)
Accumulated depreciation and amortization | Service connection or habilitation costs    
Intangible assets    
Value, at the beginning of the year (103) (101)
Amortization (33) (29)
Decreases 30 27
Value, at the end of the year (106) (103)
Accumulated depreciation and amortization | 3G/4G licenses    
Intangible assets    
Value, at the beginning of the year (681) (343)
Amortization (325) (338)
Value, at the end of the year (1,006) (681)
Accumulated depreciation and amortization | PCS license (Argentina)    
Intangible assets    
Value, at the beginning of the year (70) (70)
Value, at the end of the year (70) (70)
Accumulated depreciation and amortization | PCS and Band B (Paraguay)    
Intangible assets    
Value, at the beginning of the year (951) (774)
Currency translation adjustments (202) (177)
Value, at the end of the year (1,153) (951)
Accumulated depreciation and amortization | Rights of use    
Intangible assets    
Value, at the beginning of the year (219) (190)
Acquisition Tuves Paraguay (2)  
Amortization (29) (27)
Currency translation adjustments (3) (2)
Decreases 29  
Value, at the end of the year (224) (219)
Accumulated depreciation and amortization | Exclusivity agreements    
Intangible assets    
Value, at the beginning of the year (29) (28)
Amortization (1) (1)
Value, at the end of the year (30) (29)
Accumulated depreciation and amortization | Customer relationships    
Intangible assets    
Value, at the beginning of the year (1) (1)
Amortization (10)  
Value, at the end of the year (11) (1)
Accumulated depreciation and amortization | Software developed for internal use    
Intangible assets    
Value, at the beginning of the year (601) (566)
Currency translation adjustments (41) (35)
Value, at the end of the year (642) $ (601)
Tuves Paraguay | Customer relationships    
Intangible assets    
Value, at the end of the year 134  
Cubecorp | Customer relationships    
Intangible assets    
Value, at the end of the year $ 1