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11 Other operating income (expense) (Details) - ARS ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Summary of other operating expenses net [line items] |  |  |
Other operating income | $ 2,200 | $ 2,364 | $ 1,903
Other operating expense | (2,045) | (3,479) | (3,438)
Other operating expense, net | (2,045) | (3,479) | (3,438)
Income from customer surcharges [member] |  |  |
Summary of other operating expenses net [line items] |  |  |
Other operating income | 1,550 | 1,567 | 1,385
Commissions on municipal taxes collection [member] |  |  |
Summary of other operating expenses net [line items] |  |  |
Other operating income | 224 | 175 | 161
Fines to suppliers [member] |  |  |
Summary of other operating expenses net [line items] |  |  |
Other operating income |  | 27 | 161
Services provided to third parties [member] |  |  |
Summary of other operating expenses net [line items] |  |  |
Other operating income | 240 | 245 |
Related parties [member] |  |  |
Summary of other operating expenses net [line items] |  |  |
Other operating income | 43 | 27 | 93
Income from non-reimbursable customer contributions [member] |  |  |
Summary of other operating expenses net [line items] |  |  |
Other operating income | 26 | 9 | 12
Other [member] |  |  |
Summary of other operating expenses net [line items] |  |  |
Other operating income | 46 | 91 | 91
Gratifications for services [member] |  |  |
Summary of other operating expenses net [line items] |  |  |
Other operating expense | (51) | (262) | (155)
Cost for services provided to third parties [member] |  |  |
Summary of other operating expenses net [line items] |  |  |
Other operating expense | (96) | (132) | (110)
Severance paid [member] |  |  |
Summary of other operating expenses net [line items] |  |  |
Other operating expense | (25) | (29) | (35)
Debit and Credit Tax [member] |  |  |
Summary of other operating expenses net [line items] |  |  |
Other operating expense | (818) | (1,079) | (1,245)
Provision for contingencies [member] |  |  |
Summary of other operating expenses net [line items] |  |  |
Other operating expense | (683) | (1,861) | (1,516)
Disposals of property, plant and equipment [member] |  |  |
Summary of other operating expenses net [line items] |  |  |
Other operating expense | (151) | (86) | (281)
Refund of fines to suppliers [member] |  |  |
Summary of other operating expenses net [line items] |  |  |
Other operating expense | (129) |  |
Other [member] |  |  |
Summary of other operating expenses net [line items] |  |  |
Other operating expense | $ (92) | $ (30) | $ (96)

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