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Operating income (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
Operating income from services and other income                              
Revenues and other income                         $ 57,104 $ 45,437 $ 34,524
Operating expenses                         (39,279) (32,711) (25,079)
Operating income before depreciation and amortization                         17,825 12,726 9,445
D&A                         (6,928) (6,198) (4,438)
Disposals and impairment of PP&E                         (316) (383) (199)
Operating income from services and other income                         10,581 6,145 4,808
Operating income (loss) from equipment sales                              
Revenue from sale of telecommunication equipment                         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
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
Consolidated net income                              
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