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10. Financial instruments (Details 1) - ARS ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities at amortized cost $ 30,543,272 $ 36,109,122
Financial liabilities at fair value through profit or loss 0 0
Non-financial liabilities 0 14,191,041
Financial liabilities 30,543,272 50,300,163
Trade payables    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities at amortized cost 13,070,359 22,904,340
Financial liabilities at fair value through profit or loss 0 0
Non-financial liabilities 0 0
Financial liabilities 13,070,359 22,904,340
Other payables    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities at amortized cost 7,616,248 488,126
Financial liabilities at fair value through profit or loss 0 0
Non-financial liabilities 0 14,191,041
Financial liabilities 7,616,248 14,679,167
Borrowings    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities at amortized cost 9,856,665 12,716,656
Financial liabilities at fair value through profit or loss 0 0
Non-financial liabilities 0 0
Financial liabilities $ 9,856,665 $ 12,716,656