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Shareholders equity - Treasury shares (Details) - BRL (R$)
 12 Months Ended
Aug. 09, 2024
Jan. 26, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Aug. 30, 2024
Disclosure of classes of share capital [line items]            
Balance, Beginning of the period     34,765,600,000 51,911,569,000    
Exercised (note 22.2)     (1,005,113,000)      
Repurchase     51,115,300,000 20,000,000,000    
Canceled     (60,000,000,000) (37,145,969,000)    
Treasury Stock, Number of Shares     24,875,787,000 34,765,600,000 51,911,569,000  
Weighted Average Price Per Share, Treasury Shares     R$ 42.69 R$ 40.84    
Exercised (note 22.2)     47.55      
Repurchase     54.91 44.05    
Canceled     48.40 40.84    
Weighted Average Price Per Share, Treasury Shares     R$ 53.84 R$ 42.69 R$ 40.84  
Treasury shares     R$ 1,484,014,000 R$ 2,120,324,000    
Exercised (note 22.2)     (47,794,000)      
Repurchase     2,806,764,000 880,914,000 R$ (1,904,424,000)  
Canceled     (2,903,787,000) (1,517,224,000)    
Treasury shares     1,339,197,000 1,484,014,000 2,120,324,000  
Market Value Of Treasury Shares     1,934,010,000 2,504,214,000    
Exercised (note 22.2)     (54,213,000)      
Repurchase     2,806,764,000 880,914,000    
Canceled     (3,238,200,000) (1,570,532,000)    
Market Value Of Treasury Shares     R$ 1,536,826,000 R$ 1,934,010,000 R$ 2,504,214,000  
Share repurchase program, authorized, number of shares (in shares)     11,115,300,000      
Treasury shares cancelled            
Disclosure of classes of share capital [line items]            
Canceled 40,000,000 20,000,000        
Share Repurchase Program Authorised           40,000,000
Period for shares to be held as treasury shares   18 months