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5 Financial risk management (Details 6) - ARS ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Summary of financial risk management [line items]    
Assets $ 4,946 $ 4,138
Liabilities 1 279
Derivative financial instruments [member]    
Summary of financial risk management [line items]    
Liabilities 1 279
Level 1 [member]    
Summary of financial risk management [line items]    
Assets 4,946 4,138
Liabilities
Level 1 [member] | Derivative financial instruments [member]    
Summary of financial risk management [line items]    
Liabilities
Level 2 [member]    
Summary of financial risk management [line items]    
Assets
Liabilities 1 279
Level 2 [member] | Derivative financial instruments [member]    
Summary of financial risk management [line items]    
Liabilities 1 279
Money market funds [member]    
Summary of financial risk management [line items]    
Assets   3,798
Money market funds [member] | Level 1 [member]    
Summary of financial risk management [line items]    
Assets   3,798
Money market funds [member] | Level 2 [member]    
Summary of financial risk management [line items]    
Assets  
Government bonds [member]    
Summary of financial risk management [line items]    
Assets 2,222  
Government bonds [member] | Level 1 [member]    
Summary of financial risk management [line items]    
Assets 2,222  
Government bonds [member] | Level 2 [member]    
Summary of financial risk management [line items]    
Assets  
Money market funds [member]    
Summary of financial risk management [line items]    
Assets 2,724 340
Money market funds [member] | Level 1 [member]    
Summary of financial risk management [line items]    
Assets 2,724 340
Money market funds [member] | Level 2 [member]    
Summary of financial risk management [line items]    
Assets