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5 Financial risk management (Details 3) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of financial risk management [line items]      
Total loans $ 8,404 $ 13,418 $ 17,311
US dollar      
Summary of financial risk management [line items]      
Total loans 8,404 13,418  
Fixed rate [member]      
Summary of financial risk management [line items]      
Total loans 8,404 11,355  
Fixed rate [member] | US dollar      
Summary of financial risk management [line items]      
Total loans 8,404 11,355  
Floating rate [member]      
Summary of financial risk management [line items]      
Total loans 2,063  
Floating rate [member] | US dollar      
Summary of financial risk management [line items]      
Total loans 2,063  
Decrease in the profit (loss) due to a 1% increase in floating interest rates (4)  
Increase in the profit (loss) due to a 1% decrease in floating interest rates $ 4