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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2018
Segment financial information |  |  |  |
Revenues | $ 301,596 | $ 322,686 |  | $ 351,948
Operating costs without depreciation, amortization and impairment of fixed assets | (198,708) | (217,744) |  | (233,892)
Adjusted EBITDA | 102,888 | 104,942 |  | 118,056
Depreciation, amortization and impairment of fixed assets | (82,594) | (83,439) |  | (73,535)
Operating income | 20,294 | 21,503 |  | 44,521
Earnings (losses) from associates | 496 | (255) |  | 494
Debt financial expenses | (24,698) | (22,677) |  | (71,150)
Other financial results, net | 7,055 | 15,426 |  | 31,786
Income before income tax (expense) benefit | 3,147 | 13,997 |  | 5,651
Income tax (expense) benefit | (8,251) | (19,290) |  | 5,943
Net (loss) income for the year | (5,104) | (5,293) | $ 11,594 | 11,594
Attributable to: |  |  |  |
Controlling Company | (5,715) | (5,985) |  | 11,089
Non-controlling interest | 611 | 692 |  | 505
Eliminations |  |  |  |
Segment financial information |  |  |  |
Revenues | (1,409) | (1,666) |  | (1,474)
Operating costs without depreciation, amortization and impairment of fixed assets | 1,409 | 1,666 |  | 1,474
Services rendered in Argentina | Restated for inflation |  |  |  |
Segment financial information |  |  |  |
Revenues | 281,809 | 302,585 |  | 333,004
Operating costs without depreciation, amortization and impairment of fixed assets | (186,780) | (204,313) |  | (221,362)
Adjusted EBITDA | 95,029 | 98,272 |  | 111,642
Depreciation, amortization and impairment of fixed assets | (77,236) | (78,373) |  | (68,891)
Operating income | 17,793 | 19,899 |  | 42,751
Services rendered in Argentina | Amounts not adjusted for inflation |  |  |  |
Segment financial information |  |  |  |
Revenues | 240,325 | 182,233 |  | 129,836
Operating costs without depreciation, amortization and impairment of fixed assets | (158,901) | (121,682) |  | (85,942)
Adjusted EBITDA | 81,424 | 60,551 |  | 43,894
Depreciation, amortization and impairment of fixed assets | (31,807) | (26,024) |  | (20,416)
Operating income | 49,617 | 34,527 |  | 23,478
Services rendered in Argentina | Inflation restatement |  |  |  |
Segment financial information |  |  |  |
Revenues | 41,484 | 120,352 |  | 203,168
Operating costs without depreciation, amortization and impairment of fixed assets | (27,879) | (82,631) |  | (135,420)
Adjusted EBITDA | 13,605 | 37,721 |  | 67,748
Depreciation, amortization and impairment of fixed assets | (45,429) | (52,349) |  | (48,475)
Operating income | (31,824) | (14,628) |  | 19,273
Other abroad segments | Restated for inflation |  |  |  |
Segment financial information |  |  |  |
Revenues | 21,196 | 21,767 |  | 20,418
Operating costs without depreciation, amortization and impairment of fixed assets | (13,337) | (15,097) |  | (14,004)
Adjusted EBITDA | 7,859 | 6,670 |  | 6,414
Depreciation, amortization and impairment of fixed assets | (5,358) | (5,066) |  | (4,644)
Operating income | 2,501 | 1,604 |  | 1,770
Other abroad segments | Amounts not adjusted for inflation |  |  |  |
Segment financial information |  |  |  |
Revenues | 18,183 | 12,931 |  | 7,894
Operating costs without depreciation, amortization and impairment of fixed assets | (11,419) | (8,946) |  | (5,414)
Adjusted EBITDA | 6,764 | 3,985 |  | 2,480
Depreciation, amortization and impairment of fixed assets | (4,401) | (2,869) |  | (1,753)
Operating income | 2,363 | 1,116 |  | 727
Other abroad segments | Inflation restatement |  |  |  |
Segment financial information |  |  |  |
Revenues | 3,013 | 8,836 |  | 12,524
Operating costs without depreciation, amortization and impairment of fixed assets | (1,918) | (6,151) |  | (8,590)
Adjusted EBITDA | 1,095 | 2,685 |  | 3,934
Depreciation, amortization and impairment of fixed assets | (957) | (2,197) |  | (2,891)
Operating income | $ 138 | $ 488 |  | $ 1,043

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