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Intangible assets - Gross Value (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Intangible assets      
Value, at the beginning of the year $ 7,592 $ 7,659  
CAPEX 1,238 1,754 $ 3,704
Value, at the end of the year 7,098 7,592 7,659
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    
Gross carrying value      
Intangible assets      
Value, at the beginning of the year 11,788 10,851  
Acquisition Tuves Paraguay 190    
CAPEX 1,238 1,754  
Currency translation adjustments 300 248  
Decreases (1,535) (1,065)  
Value, at the end of the year 11,981 11,788 10,851
Gross carrying value | SAC | Fixed services      
Intangible assets      
Value, at the beginning of the year 226 234  
CAPEX 87 137  
Decreases (169) (145)  
Value, at the end of the year 144 226 234
Gross carrying value | SAC | Mobile Services      
Intangible assets      
Value, at the beginning of the year 2,838 2,157  
Acquisition Tuves Paraguay 55    
CAPEX 1,081 1,544  
Currency translation adjustments 35 30  
Decreases (1,295) (893)  
Value, at the end of the year 2,714 2,838 2,157
Gross carrying value | Service connection or habilitation costs      
Intangible assets      
Value, at the beginning of the year 222 208  
CAPEX 50 41  
Decreases (30) (27)  
Value, at the end of the year 242 222 208
Gross carrying value | 3G/4G licenses      
Intangible assets      
Value, at the beginning of the year 5,786 5,786  
Value, at the end of the year 5,786 5,786 5,786
Gross carrying value | PCS license (Argentina)      
Intangible assets      
Value, at the beginning of the year 658 658  
Value, at the end of the year 658 658 658
Gross carrying value | PCS and Band B (Paraguay)      
Intangible assets      
Value, at the beginning of the year 951 774  
CAPEX 3    
Currency translation adjustments 202 177  
Value, at the end of the year 1,156 951 774
Gross carrying value | Rights of use      
Intangible assets      
Value, at the beginning of the year 463 425  
Acquisition Tuves Paraguay 4    
CAPEX 17 32  
Currency translation adjustments 7 6  
Decreases (41)    
Value, at the end of the year 450 463 425
Gross carrying value | Exclusivity agreements      
Intangible assets      
Value, at the beginning of the year 41 41  
Value, at the end of the year 41 41 41
Gross carrying value | Customer relationships      
Intangible assets      
Value, at the beginning of the year 2 2  
Acquisition Tuves Paraguay 129    
Currency translation adjustments 15    
Value, at the end of the year 146 2 2
Gross carrying value | Goodwill      
Intangible assets      
Acquisition Tuves Paraguay 2    
Value, at the end of the year 2    
Gross carrying value | 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 $ 566
Tuves Paraguay | Customer relationships      
Intangible assets      
Value, at the end of the year $ 134