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10. Financial instruments (Details 4) - ARS ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]    
Trade receivables $ 12,460,070 $ 11,667,923
Group 1    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables [1] 10,560,628 9,900,482
Group 2    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables [2] 529,945 738,460
Group 3    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables [3] $ 1,369,497 $ 1,028,981
[1] Relates to customers with debt to become due.
[2] Relates to customers with past due debt from 0 to 3 months.
[3] Relates to customers with past due debt from 3 to 12 months.