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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)