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EQUITY - Capital increase (Details)
R$ in Thousands
 12 Months Ended
Feb. 28, 2023
BRL (R$)
shares
Dec. 31, 2023
BRL (R$)
shares
Mar. 21, 2023
BRL (R$)
shares
Dec. 31, 2022
BRL (R$)
shares
Dec. 31, 2021
BRL (R$)
shares
Dec. 31, 2020
BRL (R$)
EQUITY            
Increase in capital through capitalization of retained earnings | R$ R$ 966,162          
Number of shares authorized through capitalization of retained earnings 83,669,860          
Shares subscribed and paid up   1,757,067,050 1,757,067,050 1,673,397,190 1,719,658,728  
Equity | R$   R$ 49,238,863 R$ 20,215,343 R$ 46,298,193 R$ 42,815,649 R$ 31,085,210
Ratio of capital increase bonus issued 0.05          
Common shares            
EQUITY            
Number of shares authorized through capitalization of retained earnings 28,596,497          
Shares subscribed and paid up   600,526,442 600,526,442 571,929,945 573,627,483  
Preferred shares            
EQUITY            
Number of shares authorized through capitalization of retained earnings 55,073,363          
Shares subscribed and paid up   1,156,540,608 1,156,540,608 1,101,467,245 1,146,031,245  
Investments and working capital reserve            
EQUITY            
Increase in capital through capitalization of retained earnings | R$   R$ (966,162)        
Equity | R$   R$ 20,471,931   R$ 18,186,532 R$ 14,918,194 R$ 5,495,796