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15 Financial instruments (Details 2) - 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
Financial instruments 21,718 21,406 8,950
Interest income [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost 55 78 1,406
Financial assets at fair value through profit or loss
Financial instruments 55 78 1,406
Exchange differences [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost 570 830 6,000
Financial assets at fair value through profit or loss 579 1,456
Financial instruments 1,149 2,286 6,000
Changes in fair value of financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost
Financial assets at fair value through profit or loss 989 383 1,563
Financial instruments 989 383 1,563
Adjustment to present value [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost   622 (1)
Financial assets at fair value through profit or loss  
Financial instruments   $ 622 (1)
Corporate notes [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost 415    
Financial assets at fair value through profit or loss    
Financial instruments $ 415    
Bank fees and expenses [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost     (18)
Financial assets at fair value through profit or loss    
Financial instruments     $ (18)