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19. SHAREHOLDERS' EQUITY (Details 1)
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2017
R$ / shares
shares
Dec. 31, 2016
shares
Average buyback price | R$ / shares   R$ 7.86  
Number bought back 30,391,000 30,391,000  
Balance in treasury 1,387,524,047 1,387,524,047 1,387,524,047
Buyback program 1      
Board's Authorization 3/13/2014    
Authorized quantity 70,205,661 70,205,661  
Program Period From 3/14/2014 to 4/14/2014    
Average buyback price | $ / shares $ 9.34    
Minimum and maximum buyback price R$ 9.22 and R$ 9.45    
Number bought back 2,350,000 2,350,000  
Balance in treasury 2,350,000 2,350,000  
Buyback program 2      
Board's Authorization 4/15/2014    
Authorized quantity 67,855,661 67,855,661  
Program Period From 4/16/2014 to 5/23/2014    
Average buyback price | $ / shares $ 8.97    
Minimum and maximum buyback price R$ 8.70 and R$ 9.48    
Number bought back 9,529,500 9,529,500  
Balance in treasury 11,879,500 11,879,500  
Buyback program 3      
Board's Authorization 5/23/2014    
Authorized quantity 58,326,161 58,326,161  
Program Period From 5/26/2014 to 6/25/2014    
Average buyback price | $ / shares $ 9.21    
Minimum and maximum buyback price R$ 8.61 e R$ 9.72    
Number bought back 31,544,500 31,544,500  
Balance in treasury 43,424,000 43,424,000  
Buyback program 4      
Board's Authorization 6/26/2014    
Authorized quantity 26,781,661 26,781,661  
Program Period From 6/26/2014 to 7/17/2014    
Average buyback price | $ / shares $ 10.42    
Minimum and maximum buyback price R$ 9.33 and R$ 11.54    
Number bought back 26,781,661 26,781,661  
Balance in treasury 70,205,661 70,205,661  
Buyback program 4 (2)      
Board's Authorization 7/18/2014    
Authorized quantity  
Average buyback price | $ / shares    
Minimum and maximum buyback price Not applicable    
Share cancelation [1] 60,000,000 60,000,000  
Balance in treasury 10,205,661 10,205,661  
Buyback program 5      
Board's Authorization 7/18/2014    
Authorized quantity 64,205,661 64,205,661  
Program Period From 7/18/2014 to 8/18/2014    
Average buyback price | $ / shares $ 11.40    
Minimum and maximum buyback price R$ 11.40    
Number bought back 240,400 240,400  
Balance in treasury 10,446,061 10,446,061  
Buyback program 5 (2)      
Board's Authorization 8/19/2014    
Authorized quantity  
Average buyback price | $ / shares    
Minimum and maximum buyback price Not applicable    
Share cancelation [1] 10,446,061 10,446,061  
Balance in treasury  
Buyback program 6      
Board's Authorization 8/19/2014    
Authorized quantity 63,161,055 63,161,055  
Program Period From 8/19/2014 to 9/25/2014    
Average buyback price | $ / shares $ 9.82    
Minimum and maximum buyback price R$ 9.47 and R$ 10.07    
Number bought back 6,791,300 6,791,300  
Balance in treasury 6,791,300 6,791,300  
Buyback program 7      
Board's Authorization 9/29/2014    
Authorized quantity 56,369,755 56,369,755  
Program Period From 9/29/2014 to 2/29/2014    
Average buyback price | $ / shares $ 7.49    
Minimum and maximum buyback price R$ 4.48 and R$ 9.16    
Number bought back 21,758,600 21,758,600  
Balance in treasury 28,549,900 28,549,900  
Buyback program 8      
Board's Authorization 12/30/2014    
Authorized quantity 34,611,155 34,611,155  
Program Period From 12/31/2014 to 3/31/2015    
Average buyback price | $ / shares $ 5.10    
Minimum and maximum buyback price R$ 4.90 and R$ 5.39    
Number bought back 1,841,100 1,841,100  
Balance in treasury 30,391,000 30,391,000  
Buyback program 9      
Board's Authorization [2] 03/31/2015    
Authorized quantity [2] 32,770,055 32,770,055  
Program Period [2] From 4/01/2015 to 6/30/2015    
Average buyback price | $ / shares    
Balance in treasury  
[1] In 2014 the Board of Directors approved the cancelation of 70,446,061 treasury shares without change in the Company's share capital.
[2] There were no share buyback in this program.