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15 Financial instruments (Details) - ARS ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost $ 16,446 $ 17,608 $ 7,387
Financial assets at fair value through profit or loss 4,946 3,798 1,563
Non-financial assets 326  
Total 21,718 21,406 $ 8,950
Trade receivables [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost 14,151 16,961  
Financial assets at fair value through profit or loss  
Non-financial assets  
Total 14,151 16,961  
Other receivables [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost 340 429  
Financial assets at fair value through profit or loss  
Non-financial assets 326  
Total 666 429  
Cash and cash equivalents [member] | Cash and banks [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost 1,638 218  
Financial assets at fair value through profit or loss  
Non-financial assets  
Total 1,638 218  
Cash and cash equivalents [member] | Money market funds [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost    
Financial assets at fair value through profit or loss 2,724    
Non-financial assets    
Total 2,724    
Financial assets at fair value through profit or loss [member] | Money market funds [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost    
Financial assets at fair value through profit or loss   3,798  
Non-financial assets    
Total   $ 3,798  
Financial assets at fair value through profit or loss [member] | Government bonds [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost    
Financial assets at fair value through profit or loss 2,222    
Non-financial assets    
Total 2,222    
Financial assets at amortized cost [member] | Government bonds [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost 317    
Financial assets at fair value through profit or loss    
Non-financial assets    
Total $ 317