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SIGNIFICANT ACCOUNTING POLICIES - Consolidation of structured entities (Details) - Adesol - Call Option Agreement of Adesol
$ in Millions
 12 Months Ended
Jan. 16, 2018
ARS ($)
Dec. 30, 2017
Dec. 28, 2017
USD ($)
Dec. 28, 2017
ARS ($)
Dec. 22, 2016
ARS ($)
Dec. 31, 2018
ARS ($)
Disclosure of Detailed Information About Significant Accounting Policies [line items]            
Purchase price of call option     $ 5,011,747 $ 45 $ 128  
Extension period of call option     2 years 2 years    
Period available for payment of supplement to option premium   10 days        
Supplement option premium payable     $ 4,500,000   $ 45 $ 83
Period available for grantor for returning of premium after expiration     10 days 10 days    
Supplement option premium receivable after expiration of call option     $ 2,500,000      
Other deferred            
Disclosure of Detailed Information About Significant Accounting Policies [line items]            
Supplemental option premium paid $ 91         $ 132