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EQUITY - Changes in treasury stocks (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Nov. 08, 2022
Value of shares        
Balance at beginning of year R$ 42,815,649 R$ 31,085,210 R$ 27,173,127  
Exercise of long-term incentive plan 45,566 143,982 9,596  
Balance at end of year R$ 46,298,193 R$ 42,815,649 R$ 31,085,210  
Common shares        
Number of shares        
Balance at beginning of the year 571,929,945 571,929,945 571,929,945  
Balance at end of year 571,929,945 571,929,945 571,929,945  
Preferred shares        
Number of shares        
Balance at beginning of the year 1,133,816,901 1,129,231,487 1,127,010,827  
Share buyback program 44,564,000      
Exercise of long-term incentive plan (2,377,494) (4,585,414) (2,220,660)  
Balance at end of year 1,091,630,395 1,133,816,901 1,129,231,487  
Treasury Stocks        
Value of shares        
Balance at beginning of year R$ (152,409) R$ (229,309) R$ (242,542)  
Exercise of long-term incentive plan 21,452 76,900 13,233  
Balance at end of year R$ (179,995) R$ (152,409) R$ (229,309)  
Treasury Stocks | Common shares        
Number of shares        
Balance at beginning of the year 1,697,538 1,697,538 1,697,538  
Cancellation of treasury stocks (1,697,538)     (1,697,538)
Balance at end of year 0 1,697,538 1,697,538  
Value of shares        
Balance at beginning of year R$ 557 R$ 557 R$ 557  
Cancellation of treasury stocks (557)      
Balance at end of year R$ 0 R$ 557 R$ 557  
Treasury Stocks | Preferred shares        
Number of shares        
Balance at beginning of the year 12,214,344 16,799,758 19,020,418  
Share buyback program 44,564,000      
Exercise of long-term incentive plan (2,377,494) 4,585,414 2,220,660  
Cancellation of treasury stocks (44,564,000)     (44,564,000)
Balance at end of year 9,836,850 12,214,344 16,799,758  
Value of shares        
Balance at beginning of year R$ 151,852 R$ 228,752 R$ 241,985  
Share buyback program 1,073,124      
Exercise of long-term incentive plan (21,452) (76,900) (13,233)  
Cancellation of treasury stocks (1,023,529)      
Balance at end of year R$ 179,995 R$ 151,852 R$ 228,752