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28. Income tax / deferred tax (Details 1) - ARS ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SummaryOfIncomeTaxDeferredTaxLineItems [Line Items]        
Deferred tax asset $ 2,067,449 $ 4,485,445    
Deferred tax liability (22,122,414) (16,861,327)    
Net deferred tax (liabilities) (20,054,965) (12,375,882) $ (11,210,062) $ (11,591,518)
To be recovered in less than 12 months        
SummaryOfIncomeTaxDeferredTaxLineItems [Line Items]        
Deferred tax asset 2,066,726 1,567,287    
Deferred tax liability (22,121,773) (16,453,585)    
To be recovered in more than 12 months        
SummaryOfIncomeTaxDeferredTaxLineItems [Line Items]        
Deferred tax asset 723 2,918,158    
Deferred tax liability $ (641) $ (407,742)