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13. Trade receivables (Details 2) - ARS ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables $ 12,460,070 $ 11,667,923
Not due    
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables 9,003 15,957
Past due    
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables 1,899,443 1,767,442
Up to 3 months    
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables $ 10,551,624 $ 9,884,524