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20. SHAREHOLDERS' EQUITY (Details 1) - R$ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Average buyback price R$ 7.86  
Number bought back 7,409,500  
Balance in treasury 1,387,524,047 1,387,524,047
Buyback program 1    
Board's Authorization 3/13/2014  
Authorized quantity 70,205,661  
Program Period From 3/14/2014 to 4/14/2014  
Average buyback price R$ 9.34  
Minimum and maximum buyback price R$ 9,22 and R$ 9,45  
Number bought back 2,350,000  
Balance in treasury 2,350,000  
Buyback program 2    
Board's Authorization 4/15/2014  
Authorized quantity 67,855,661  
Program Period From 4/16/2014 to 5/23/2014  
Average buyback price R$ 8.97  
Minimum and maximum buyback price R$ 8,70 and R$ 9,48  
Number bought back 9,529,500  
Balance in treasury 11,879,500  
Buyback program 3    
Board's Authorization 5/23/2014  
Authorized quantity 58,326,161  
Program Period From 5/26/2014 to 6/25/2014  
Average buyback price R$ 9.21  
Minimum and maximum buyback price R$ 8,61 and R$ 9,72  
Number bought back 31,544,500  
Balance in treasury 43,424,000  
Buyback program 4    
Board's Authorization 6/26/2014  
Authorized quantity 26,781,661  
Program Period From 6/26/2014 to 7/17/2014  
Average buyback price R$ 10.42  
Minimum and maximum buyback price R$ 9,33 and R$ 11,54  
Number bought back 26,781,661  
Balance in treasury 70,205,661  
Buyback program 4 (2)    
Board's Authorization 7/18/2014  
Average buyback price  
Minimum and maximum buyback price Not applicable  
Share cancelation 60,000,000  
Balance in treasury 10,205,661  
Buyback program 5    
Board's Authorization 7/18/2014  
Authorized quantity 64,205,661  
Program Period From 7/18/2014 to 8/18/2014  
Average buyback price R$ 11.40  
Minimum and maximum buyback price R$ 11.40  
Number bought back 240,400  
Balance in treasury 10,446,061  
Buyback program 5 (2)    
Board's Authorization 8/18/2014  
Average buyback price  
Minimum and maximum buyback price Not applicable  
Share cancelation 10,446,061  
Buyback program 6    
Board's Authorization 8/18/2014  
Authorized quantity 63,161,055  
Program Period From 8/19/2014 to 9/25/2014  
Average buyback price R$ 9.82  
Minimum and maximum buyback price R$ 9,47 and R$ 10,07  
Number bought back 6,791,300  
Balance in treasury 6,791,300  
Buyback program 7    
Board's Authorization 9/29/2014  
Authorized quantity 56,369,755  
Program Period From 9/29/2014 to 2/29/2014  
Average buyback price R$ 7.49  
Minimum and maximum buyback price R$ 4,48 and R$ 9,16  
Number bought back 21,758,600  
Balance in treasury 28,549,900  
Buyback program 8    
Board's Authorization 12/30/2014  
Authorized quantity 34,611,155  
Program Period From 12/31/2014 to 3/31/2015  
Average buyback price R$ 5.10  
Minimum and maximum buyback price R$ 4,90 and R$ 5,39  
Number bought back 1,841,100  
Balance in treasury 30,391,000  
Buyback program 9    
Board's Authorization 03/31/2015  
Authorized quantity 32,770,055  
Program Period From 4/01/2015 to 6/30/2015  
Balance in treasury 30,391,000  
Buyback program 9 (2)    
Board's Authorization 04/20/2018  
Authorized quantity 30,391,000  
Program Period From 4/20/2018 to 4/30/2018  
Average buyback price  
Minimum and maximum buyback price Não aplicável  
Number bought back 0.00  
Share cancelation 0.00  
Disposal of shares 22,981,500  
Balance in treasury 7,409,500