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Operating income - Breakdown of operating income by segment (Details) - ARS ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Services revenues and other income                              
Third party revenues                         $ 57,104 $ 45,437  
Third party operating expenses                         (39,279) (32,711)  
Subtotal income for services revenues and other                         17,825 12,726 $ 9,445
Equipments revenues                              
Equipment sales                         8,215 7,886 6,016
Cost of equipments and handsets                         (6,684) (6,188) (4,595)
Total income for sale of equipment and handsets                         1,531 1,698 1,421
Total operating income before depreciation and amortization                         19,356 14,424 10,866
D&A                         (6,928) (6,198) (4,438)
Disposals and impairment of PP&E                         (316) (383) (199)
Operating income $ 3,094 $ 3,167 $ 2,958 $ 2,893 $ 2,320 $ 1,802 $ 1,724 $ 1,997 $ 1,770 $ 1,311 $ 1,468 $ 1,680 12,112 7,843 6,229
Operating segment                              
Services revenues and other income                              
Third party revenues                             34,524
Third party operating expenses                             (25,079)
Eliminations                              
Services revenues and other income                              
Third party revenues                         (2,737) (2,105) (1,971)
Third party operating expenses                         2,737 2,105 1,971
Fixed services                              
Services revenues and other income                              
Third party revenues                         19,868 14,989  
Third party operating expenses                         (18,262) (13,464)  
Equipments revenues                              
Equipment sales                         663 91 61
Cost of equipments and handsets                         (524) (136) (82)
Total income for sale of equipment and handsets                         139 (45) (21)
Total operating income before depreciation and amortization                         1,745 1,480 830
Operating income                         (512) (416) (787)
Fixed services | Operating segment                              
Services revenues and other income                              
Third party revenues                             10,714
Third party operating expenses                             (9,863)
Subtotal income for services revenues and other                         3,711 3,314 2,548
Equipments revenues                              
Equipment sales                         663 91 61
Cost of equipments and handsets                         (524) (136) (82)
Total income for sale of equipment and handsets                         139 (45) (21)
Total operating income before depreciation and amortization                         3,850 3,269 2,527
D&A                         (2,236) (1,897) (1,526)
Disposals and impairment of PP&E                         (21) 1 (91)
Operating income                         1,593 1,373 910
Fixed services | Eliminations                              
Services revenues and other income                              
Third party revenues                         (2,421) (1,947) (1,834)
Third party operating expenses                         316 158 137
Equipments revenues                              
Operating income                         (2,105) (1,789) (1,697)
Mobile Services                              
Services revenues and other income                              
Third party revenues                         37,236 30,448  
Third party operating expenses                         (21,017) (19,247)  
Equipments revenues                              
Equipment sales                         7,552 7,795 5,955
Total operating income before depreciation and amortization                         17,611 12,944 10,036
Operating income                         12,624 8,259 7,016
Mobile Services | Operating segment                              
Services revenues and other income                              
Third party revenues                             23,810
Third party operating expenses                             (15,216)
Subtotal income for services revenues and other                         14,114 9,412 6,897
Equipments revenues                              
Equipment sales                         7,552 7,795 5,955
Cost of equipments and handsets                         (6,160) (6,052) (4,513)
Total income for sale of equipment and handsets                         1,392 1,743 1,442
Total operating income before depreciation and amortization                         15,506 11,155 8,339
D&A                         (4,692) (4,301) (2,912)
Disposals and impairment of PP&E                         (295) (384) (108)
Operating income                         10,519 6,470 5,319
Mobile Services | Eliminations                              
Services revenues and other income                              
Third party revenues                         (316) (158) (137)
Third party operating expenses                         2,421 1,947 1,834
Equipments revenues                              
Operating income                         $ 2,105 $ 1,789 $ 1,697