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EQUITY - Treasury stocks (Details) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Value of shares      
Balance at beginning of year R$ 31,085,210 R$ 27,173,127 R$ 25,938,571
Exercise of stock options 143,982 9,596 29,411
Balance at end of year R$ 42,815,649 R$ 31,085,210 R$ 27,173,127
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 1,129,231,487 1,127,010,827 1,124,233,755
Exercise of long-term incentive plan 4,585,414 2,220,660 2,777,072
Balance at end of period 1,133,816,901 1,129,231,487 1,127,010,827
Treasury Stocks      
EQUITY      
Average acquisition cost R$ 12.43 R$ 13.62 R$ 12.72
Value of shares      
Balance at beginning of year R$ (229,309) R$ (242,542) R$ (280,426)
Exercise of stock options 76,900 13,233 37,884
Balance at end of year R$ (152,409) R$ (229,309) R$ (242,542)
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 year R$ 557 R$ 557 R$ 557
Balance at end of year R$ 557 R$ 557 R$ 557
Treasury Stocks | Preferred shares      
Number of shares      
Balance at beginning of the year 16,799,758 19,020,418 21,797,490
Exercise of long-term incentive plan (4,585,414) (2,220,660) (2,777,072)
Balance at end of period 12,214,344 16,799,758 19,020,418
Value of shares      
Balance at beginning of year R$ 228,752 R$ 241,985 R$ 279,869
Exercise of stock options (76,900) (13,233) (37,884)
Balance at end of year R$ 151,852 R$ 228,752 R$ 241,985