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INVENTORIES - Movements in the allowance for obsolescence of inventories (Details) - ARS ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Movements in the allowance for obsolescence of inventories    
At the beginning of the year $ 4,210  
At the end of the year 3,212 $ 4,210
Accumulated impairment    
Movements in the allowance for obsolescence of inventories    
At the beginning of the year (205) (82)
Additions (131) (125)
Decreases (includes RECPAM) 110 2
At the end of the year $ (226) $ (205)