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5 Financial risk management (Details 1) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Summary of financial risk management [line items]    
Net position assets/(liabilities) $ (8,142) $ (10,911)
US dollar    
Summary of financial risk management [line items]    
Net position assets/(liabilities) (8,187) (10,851)
Japanese Yen (JPY)    
Summary of financial risk management [line items]    
Net position assets/(liabilities) 45
Euro    
Summary of financial risk management [line items]    
Net position assets/(liabilities) (38)
Norwegian krone (NOK)    
Summary of financial risk management [line items]    
Net position assets/(liabilities) (1)
Swiss franc (CHF)    
Summary of financial risk management [line items]    
Net position assets/(liabilities) $ (21)