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EQUITY (Details) - shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Classes of share capital [Roll Forward]    
Opening balance 608,374,525 551,847,819
There is no movement of authorized shares during the period 2017  
Increase capital approved at Extraordinary Shareholders meeting dated August 18, 2016   61,316,424
Full capital decrease due to maturity of the subscription and payment period of the compensation plan 2011, December 21, 2016   (4,789,718)
Closing balance 608,374,525 608,374,525