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Segment information - Balance sheet information (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating segments      
PP&E, net $ 28,538 $ 23,165 $ 17,963
Intangible assets, net 7,098 7,592 7,659
Purchases 9,905 9,632 6,396
Capital expenditures on intangible assets (b) 1,238 1,754 3,704
Total capital expenditures in PP&E and intangible assets (a)+ (b) 11,143 11,386 10,100
Total additions on PP&E and intangible assets 12,576 11,860 11,162
Net financial asset (debt) (3,260) (5,892) (2,277)
Eliminations      
Operating segments      
Intangible assets, net (1) (1) (1)
Fixed services | Operating segment      
Operating segments      
PP&E, net 15,039 11,468 9,280
Intangible assets, net 406 429 443
Purchases 5,254 3,820 2,846
Capital expenditures on intangible assets (b) 153 197 233
Total capital expenditures in PP&E and intangible assets (a)+ (b) 5,407 4,017 3,079
Total additions on PP&E and intangible assets 6,886 4,525 3,514
Mobile Services | Operating segment      
Operating segments      
PP&E, net 13,499 11,697 8,683
Intangible assets, net 6,693 7,164 7,217
Purchases 4,651 5,812 3,550
Capital expenditures on intangible assets (b) 1,085 1,557 3,471
Total capital expenditures in PP&E and intangible assets (a)+ (b) 5,736 7,369 7,021
Total additions on PP&E and intangible assets 5,690 7,335 7,648
Personal Mobile Services | Operating segment      
Operating segments      
PP&E, net 10,901 9,541 6,899
Intangible assets, net 6,482 7,086 7,131
Purchases 4,161 5,249 3,157
Capital expenditures on intangible assets (b) 1,032 1,481 3,395
Total capital expenditures in PP&E and intangible assets (a)+ (b) 5,193 6,730 6,552
Total additions on PP&E and intangible assets 5,173 6,708 7,158
Nucleo Mobile Services | Operating segment      
Operating segments      
PP&E, net 2,598 2,156 1,784
Intangible assets, net 211 78 86
Purchases 490 563 393
Capital expenditures on intangible assets (b) 53 76 76
Total capital expenditures in PP&E and intangible assets (a)+ (b) 543 639 469
Total additions on PP&E and intangible assets $ 517 $ 627 $ 490