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EQUITY - Treasury stocks (Details) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Capital      
Number of shares outstanding at end of period 1,696,164,000    
Equity at beginning of period R$ 23,893,941 R$ 24,274,653 R$ 31,970,383
Repurchases 243,723   95,370
Exercise of stock options 23,354 19,682 5,560
Transfer of shares 18,984   205,800
Equity at end of period R$ 25,938,571 R$ 23,893,941 R$ 24,274,653
Investments and working capital reserve      
Investments and working capital reserve, annual percentage 5.00%    
Common shares      
Capital      
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      
Number of shares outstanding at beginning of the year 1,137,327,184 1,137,018,570 1,114,744,538
Repurchases 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
Treasury Stocks      
Capital      
Equity at beginning of period R$ (76,085) R$ (98,746) R$ (383,363)
Repurchases 243,396   95,343
Exercise of stock options 27,433 22,661 10,461
Transfer of shares 11,622   369,499
Equity at end of period R$ (280,426) R$ (76,085) R$ (98,746)
Average acquisition cost R$ 12.84 R$ 8.68 R$ 10.89
Treasury Stocks | Common shares      
Capital      
Number of shares outstanding at beginning of the year 1,697,538 1,697,538 1,697,538
Number of shares outstanding at end of period 1,697,538 1,697,538 1,697,538
Equity at beginning of period R$ 557 R$ 557 R$ 557
Equity at end of period R$ 557 R$ 557 R$ 557
Treasury Stocks | Preferred shares      
Capital      
Number of shares outstanding at beginning of the year 8,704,061 9,012,675 31,286,707
Repurchases 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 21,797,490 8,704,061 9,012,675
Equity at beginning of period R$ 75,528 R$ 98,189 R$ 382,806
Repurchases 243,396   95,343
Exercise of stock options (27,433) (22,661) (10,461)
Transfer of shares (11,622)   (369,499)
Equity at end of period R$ 279,869 R$ 75,528 R$ 98,189