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EQUITY - Common and preferred shares outstanding (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Capital      
Shares exercise period when not a public offering 30 days    
Shares exercise period for public offering 10 days    
Total capital R$ 19,249,181 R$ 19,249,181  
Reconciliations of common and preferred outstanding shares      
Number of shares outstanding at end of period 1,696,164,000    
Common shares      
Capital      
Authorized capital 1,500,000,000    
Shares subscribed and paid up 573,627,483    
Reconciliations of common and preferred outstanding shares      
Number of shares outstanding at beginning of the year 571,929,945 571,929,945 571,929,945
Number of shares outstanding at end of period 571,929,945 571,929,945 571,929,945
Preferred shares      
Capital      
Authorized capital 3,000,000,000    
Shares subscribed and paid up 1,146,031,245    
Reconciliations of common and preferred outstanding shares      
Number of shares outstanding at beginning of the year 1,137,327,184 1,137,018,570 1,114,744,538
Acquisition of Treasury shares (16,000,000)   (10,000,000)
Exercise of stock options 1,597,235 308,614 2,274,032
Transfer of shares 1,309,336   30,000,000
Number of shares outstanding at end of period 1,124,233,755 1,137,327,184 1,137,018,570