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Shareholders equity - Treasury shares - Summary (Details) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Disclosure of classes of share capital [line items]      
Balance, Beginning of the period 34,765,600 51,911,569 51,911,569
Repurchase 12,434,500   20,000,000
Canceled     (37,145,969)
Treasury Stock, Number of Shares 27,085,856   34,765,600
Weighted Average Price Per Share, Treasury Shares R$ 42.69 R$ 40.84 R$ 40.84
Repurchase 54.64   44.05
Canceled 42.69   40.84
Weighted Average Price Per Share, Treasury Shares R$ 48.17   R$ 42.69
Treasury shares R$ 1,484,014 R$ 2,120,324 R$ 2,120,324
Repurchase 679,431 778,500 880,914
Canceled (853,725)   (1,517,224)
Treasury shares 1,304,843   1,484,014
Market Value Of Treasury Shares 1,934,010 R$ 2,504,214 2,504,214
Exercised (5,928)    
Repurchase 679,431   880,914
Canceled (1,058,200)   (1,570,532)
Market Value Of Treasury Shares R$ 1,544,165   1,934,010
Maximum number of common shares that may be repurchased 40,000,000    
Share capital R$ 19,235,546   R$ 9,235,546
Repurchase Program      
Disclosure of classes of share capital [line items]      
Exercised (114,244)    
Exercised R$ 42.69    
Exercised R$ (4,877)    
Treasury shares canceled      
Disclosure of classes of share capital [line items]      
Canceled (20,000,000)