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EQUITY - Treasury stocks (Details) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Value of shares      
Balance at beginning of period R$ 27,173,127 R$ 25,938,571 R$ 23,861,554
Repurchases     243,723
Exercise of stock options 9,596 29,411 23,354
Transfer of shares     18,984
Balance at end of period R$ 31,085,210 R$ 27,173,127 R$ 25,938,571
Common shares      
Number of shares      
Balance at beginning of the year 571,929,945 571,929,945 571,929,945
Balance at end of period 571,929,945 571,929,945 571,929,945
Preferred shares      
Number of shares      
Balance at beginning of the year 1,127,010,827 1,124,233,755 1,137,327,184
Repurchases     16,000,000
Exercise of long-term incentive plan 2,220,660 2,777,072 1,597,235
Transfer of shares     1,309,336
Balance at end of period 1,129,231,487 1,127,010,827 1,124,233,755
Treasury Stocks      
EQUITY      
Average acquisition cost R$ 13.62 R$ 12.72 R$ 12.84
Value of shares      
Balance at beginning of period R$ (242,542) R$ (280,426) R$ (76,085)
Repurchases     243,396
Exercise of stock options 13,233 37,884 27,433
Transfer of shares     11,622
Balance at end of period R$ (229,309) R$ (242,542) R$ (280,426)
Treasury Stocks | Common shares      
Number of shares      
Balance at beginning of the year 1,697,538 1,697,538 1,697,538
Balance at end of period 1,697,538 1,697,538 1,697,538
Value of shares      
Balance at beginning of period R$ 557 R$ 557 R$ 557
Balance at end of period R$ 557 R$ 557 R$ 557
Treasury Stocks | Preferred shares      
Number of shares      
Balance at beginning of the year 19,020,418 21,797,490 8,704,061
Repurchases     16,000,000
Exercise of long-term incentive plan (2,220,660) (2,777,072) (1,597,235)
Transfer of shares     (1,309,336)
Balance at end of period 16,799,758 19,020,418 21,797,490
Value of shares      
Balance at beginning of period R$ 241,985 R$ 279,869 R$ 75,528
Repurchases     243,396
Exercise of stock options (13,233) (37,884) (27,433)
Transfer of shares     (11,622)
Balance at end of period R$ 228,752 R$ 241,985 R$ 279,869