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5. Financial risk management (Details 5) - ARS ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial Risk Management Details 5Abstract        
Liabilities $ 46,023,206 $ 43,088,208    
Less: cash and cash equivalents (3,409,158) (4,400,357)    
Net debt 42,614,048 38,687,851    
Total Equity 30,968,972 27,793,719 $ 22,684,597 $ 22,401,630
Total capital attributable to owners $ 73,583,020 $ 66,481,570    
Gearing ratio 57.91% 58.19%