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DESCRIPTION OF BUSINESS AND BASIS OF PREPARATION OF THE CONSOLIDATED FINANCIAL STATEMENTS - Segment financial information of Consolidated Income Statement (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment financial information      
Revenues $ 168,046 $ 66,649 $ 60,405
Operating costs without depreciation, amortization and impairment of PP&E (111,678) (42,536) (40,206)
Depreciation, amortization and impairment of PP&E and Intangible assets (35,111) (9,804) (7,883)
Operating income 21,257 14,309 12,316
Earnings from associates 236 353 221
Debt financial expenses (33,972) (217) (595)
Other financial results, net 15,177 930 4,619
Income before income tax benefit (expense) 2,698 15,375 16,561
Income tax benefit (expense) 2,838 (5,516) (6,015)
Net income for the year 5,536 9,859 10,546
Attributable to:      
Controlling Company 5,294 9,731 10,457
Non-controlling interest 242 128 89
Eliminations      
Segment financial information      
Revenues (704) (8) (6)
Operating costs without depreciation, amortization and impairment of PP&E 704 8 6
Services rendered in Argentina | Restated for inflation      
Segment financial information      
Revenues 159,001 65,466 59,530
Operating costs without depreciation, amortization and impairment of PP&E (105,695) (41,755) (39,589)
Depreciation, amortization and impairment of PP&E and Intangible assets (32,894) (9,686) (7,804)
Operating income 20,412 14,025 12,137
Services rendered in Argentina | Operating segment      
Segment financial information      
Revenues 129,836 39,870 29,726
Operating costs without depreciation, amortization and impairment of PP&E (85,942) (25,082) (19,106)
Depreciation, amortization and impairment of PP&E and Intangible assets (20,416) (3,880) (2,519)
Operating income 23,478 10,908 8,101
Services rendered in Argentina | Inflation restatement      
Segment financial information      
Revenues 29,165 25,596 29,804
Operating costs without depreciation, amortization and impairment of PP&E (19,753) (16,673) (20,483)
Depreciation, amortization and impairment of PP&E and Intangible assets (12,478) (5,806) (5,285)
Operating income (3,066) 3,117 4,036
Other abroad segments | Restated for inflation      
Segment financial information      
Revenues 9,749 1,191 881
Operating costs without depreciation, amortization and impairment of PP&E (6,687) (789) (623)
Depreciation, amortization and impairment of PP&E and Intangible assets (2,217) (118) (79)
Operating income 845 284 179
Other abroad segments | Operating segment      
Segment financial information      
Revenues 7,894 1,074 819
Operating costs without depreciation, amortization and impairment of PP&E (5,414) (711) (579)
Depreciation, amortization and impairment of PP&E and Intangible assets (1,753) (106) (73)
Operating income 727 257 167
Other abroad segments | Inflation restatement      
Segment financial information      
Revenues 1,855 117 62
Operating costs without depreciation, amortization and impairment of PP&E (1,273) (78) (44)
Depreciation, amortization and impairment of PP&E and Intangible assets (464) (12) (6)
Operating income $ 118 $ 27 $ 12