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5 Financial risk management (Details)
$ in Millions
Dec. 31, 2020
ARS ($)
ExchangeRate
$ / $
Dec. 31, 2019
ARS ($)
$ / $
Summary of financial risk management [line items]    
Exchange rate | $ / $ 84.15 59.89
Current assets [member]    
Summary of financial risk management [line items]    
Foreign currency balance assets $ 1,981 $ 4,045
Current assets [member] | Other receivables [member] | USD    
Summary of financial risk management [line items]    
Amount of foreign currency $ 6  
Exchange rate | ExchangeRate [1] 84.150  
Foreign currency balance assets $ 505 82
Current assets [member] | Other receivables [member] | JPY    
Summary of financial risk management [line items]    
Amount of foreign currency $ 55  
Exchange rate | ExchangeRate [1] 0.816  
Foreign currency balance assets $ 45
Current assets [member] | Financial assets at fair value through profit or loss [member] | USD    
Summary of financial risk management [line items]    
Amount of foreign currency  
Exchange rate | ExchangeRate [1] 84.150  
Foreign currency balance assets 3,798
Current assets [member] | Cash and cash equivalents [member] | USD    
Summary of financial risk management [line items]    
Amount of foreign currency $ 17  
Exchange rate | ExchangeRate [1] 84.150  
Foreign currency balance assets $ 1,431 164
Current assets [member] | Cash and cash equivalents [member] | EUR    
Summary of financial risk management [line items]    
Amount of foreign currency  
Exchange rate | ExchangeRate [1] 103.530  
Foreign currency balance assets 1
Total Assets [member]    
Summary of financial risk management [line items]    
Foreign currency balance assets 1,981 4,045
Non-current liabilities [member]    
Summary of financial risk management [line items]    
Foreign currency balance liabilities 8,261 11,159
Non-current liabilities [member] | USD | Borrowings [member]    
Summary of financial risk management [line items]    
Amount of foreign currency $ 98  
Exchange rate | ExchangeRate [1] 84.150  
Foreign currency balance liabilities $ 8,261 11,159
Current liabilities [member]    
Summary of financial risk management [line items]    
Foreign currency balance liabilities 1,862 3,797
Current liabilities [member] | USD | Borrowings [member]    
Summary of financial risk management [line items]    
Amount of foreign currency $ 2  
Exchange rate | ExchangeRate [1] 84.150  
Foreign currency balance liabilities $ 143 2,259
Current liabilities [member] | USD | Trade payables [member]    
Summary of financial risk management [line items]    
Amount of foreign currency $ 11  
Exchange rate | ExchangeRate [1] 84.150  
Foreign currency balance liabilities $ 962 738
Current liabilities [member] | USD | Other payables [member]    
Summary of financial risk management [line items]    
Amount of foreign currency $ 9  
Exchange rate | ExchangeRate [1] 84.150  
Foreign currency balance liabilities $ 757 739
Current liabilities [member] | EUR | Trade payables [member]    
Summary of financial risk management [line items]    
Amount of foreign currency  
Exchange rate | ExchangeRate [1] 103.530  
Foreign currency balance liabilities 39
Current liabilities [member] | CHF | Trade payables [member]    
Summary of financial risk management [line items]    
Amount of foreign currency  
Exchange rate | ExchangeRate [1] 95.413  
Foreign currency balance liabilities 21
Current liabilities [member] | NOK | Trade payables [member]    
Summary of financial risk management [line items]    
Amount of foreign currency  
Exchange rate | ExchangeRate [1] 8.211  
Foreign currency balance liabilities 1
Total Liabilities [member]    
Summary of financial risk management [line items]    
Foreign currency balance liabilities $ 10,123 $ 14,956
[1] The exchange rates used are the BNA exchange rates in effect as of December 31, 2020 for US Dollars (USD), Euros (EUR), Swiss Francs (CHF), Norwegian Krones (NOK) and Japanese Yens (JPY).