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PROPERTY, PLANT AND EQUIPMENT - Property, plant and equipment, Net (Details) - ARS ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, plant and equipment      
Property, plant and equipment $ 245,997 $ 231,236  
Gross carrying value      
Property, plant and equipment      
Property, plant and equipment 248,305 232,302  
Gross Carrying Amount, Net of allowances and impairment      
Property, plant and equipment      
Property, plant and equipment 245,997 231,236  
PP&E | Gross carrying value      
Property, plant and equipment      
Property, plant and equipment 357,981 309,280 $ 110,499
PP&E | Gross Carrying Amount, Net of allowances and impairment      
Property, plant and equipment      
Property, plant and equipment 248,305 232,302  
PP&E | Accumulated impairment      
Property, plant and equipment      
Property, plant and equipment (802) (512)  
Other | Gross carrying value      
Property, plant and equipment      
Property, plant and equipment 1,217 1,327 398
Other | Gross Carrying Amount, Net of allowances and impairment      
Property, plant and equipment      
Property, plant and equipment 577 720  
Materials | Gross carrying value      
Property, plant and equipment      
Property, plant and equipment 21,192 19,372 10,741
Materials | Gross Carrying Amount, Net of allowances and impairment      
Property, plant and equipment      
Property, plant and equipment 21,192 19,372  
Materials | Accumulated impairment      
Property, plant and equipment      
Property, plant and equipment $ (1,506) $ (554) $ (283)