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15 Financial instruments (Details 3) - ARS ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Trade receivables $ 14,151 $ 16,961
Group 1 [member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables [1] 10,437 14,376
Group 2 [member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables [2] 864 721
Group 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables [3] $ 2,850 $ 1,864
[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.