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EQUITY - Changes in treasury stocks (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Nov. 08, 2022
Value of shares        
Balance at beginning of year R$ 46,298,193 R$ 42,815,649 R$ 31,085,210  
Transfer of shares (47,006)      
Balance at end of year R$ 49,238,863 R$ 46,298,193 R$ 42,815,649  
Common shares        
Number of shares        
Balance at beginning of the year 571,929,945 571,929,945 571,929,945  
Capital increase with share bonus 28,596,497      
Balance at end of year 600,526,442 571,929,945 571,929,945  
Preferred shares        
Number of shares        
Balance at beginning of the year 1,091,630,395 1,133,816,901 1,129,231,487  
Share buyback program   44,564,000    
Exercise of long-term incentive plan (2,674,136) (2,377,494) (4,585,414)  
Capital increase with share bonus 54,691,436      
Balance at end of year 1,148,995,967 1,091,630,395 1,133,816,901  
Treasury Stocks        
Value of shares        
Balance at beginning of year R$ (179,995) R$ (152,409) R$ (229,309)  
Balance at end of year R$ (150,182) R$ (179,995) R$ (152,409)  
Treasury Stocks | Common shares        
Number of shares        
Balance at beginning of the year 1,697,538 1,697,538  
Exercise of long-term incentive plan      
Cancellation of treasury stocks   (1,697,538)   (1,697,538)
Balance at end of year   1,697,538  
Value of shares        
Balance at beginning of year R$ 557 R$ 557  
Exercise of long-term incentive plan      
Cancellation of treasury stocks   (557)    
Balance at end of year   R$ 557  
Treasury Stocks | Preferred shares        
Number of shares        
Balance at beginning of the year 9,836,850 12,214,344 16,799,758  
Share buyback program   44,564,000    
Exercise of long-term incentive plan (2,674,136) 2,377,494 4,585,414  
Capital increase with share bonus 381,927      
Cancellation of treasury stocks   (44,564,000)   (44,564,000)
Balance at end of year 7,544,641 9,836,850 12,214,344  
Value of shares        
Balance at beginning of year R$ 179,995 R$ 151,852 R$ 228,752  
Share buyback program   1,073,124    
Exercise of long-term incentive plan (29,813) (21,452) (76,900)  
Cancellation of treasury stocks   (1,023,529)    
Balance at end of year R$ 150,182 R$ 179,995 R$ 151,852