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LONG-TERM INCENTIVE PLANS - Restricted Shares and Performance Shares (Details) - Restricted Shares and Performance Shares
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
BRL (R$)
EquityInstruments
shares
Dec. 31, 2017
BRL (R$)
EquityInstruments
Dec. 31, 2016
EquityInstruments
LONG-TERM INCENTIVE PLANS      
Balance, beginning of year 18,975,084 20,433,491 12,525,256
Granted 2,411,345 3,170,952 13,357,922
Cancelled (3,150,635) (1,901,782) (3,046,593)
Exercised (3,974,293) (2,727,577) (2,403,094)
Balance, end of year 14,261,501 18,975,084 20,433,491
Expense from equity-settled long-term incentive plan | R$ R$ 41,186 R$ 25,403  
Grace period   3 years 5 years
Preferred shares      
LONG-TERM INCENTIVE PLANS      
Treasury shares | shares 21,797,490