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Property, plant and equipment - Materials (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of changes in property, plant and equipment      
Property, plant and equipment at beginning of period $ 23,165 $ 17,963  
Purchases 9,905 9,632 $ 6,396
Additions (316) (383) (199)
Property, plant and equipment at end of period 28,538 23,165 17,963
Gross carrying value      
Reconciliation of changes in property, plant and equipment      
Property, plant and equipment at beginning of period 61,157 51,149  
Purchases   9,632  
Currency translation adjustments   1,430  
Property, plant and equipment at end of period   61,157 51,149
Gross carrying value | Materials      
Reconciliation of changes in property, plant and equipment      
Property, plant and equipment at beginning of period 1,629 1,652  
Increase for Tuves Paraguay acquisition 72    
Purchases 5,133 3,647  
Disposal for maintenance (1,125) (507)  
Transfers to CAPEX (3,700) (3,173)  
Currency translation adjustments 15 10  
Property, plant and equipment at end of period 2,024 1,629 1,652
Accumulated impairment | Materials      
Reconciliation of changes in property, plant and equipment      
Property, plant and equipment at beginning of period (68) (52)  
Additions (94) (16)  
Decrease 18    
Property, plant and equipment at end of period $ (144) $ (68) $ (52)