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Shareholders equity - Treasury shares (Details) - BRL (R$)
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Disclosure of classes of share capital [line items]      
Balance, Beginning of the period 24,875,787,000 34,765,600,000 34,765,600,000
Exercised (372,160,000)   (1,005,113,000)
Repurchase 3,705,200,000   51,115,300,000
Stock canceled During Period, Shares     (60,000,000,000)
Treasury Stock, Number of Shares 28,208,827,000   24,875,787,000
Weighted Average Price Per Share, Treasury Shares R$ 53.84 R$ 42.69 R$ 42.69
Exercised 53.66   47.55
Repurchase 51.80   54.91
Canceled     48.40
Weighted Average Price Per Share, Treasury Shares R$ 53.57   R$ 53.84
Treasury shares R$ 1,339,197,000 R$ 1,484,014,000 R$ 1,484,014,000
Exercised (19,969,000)   (47,794,000)
Repurchase 191,918,000 679,431,000 2,806,764,000
Canceled     (2,903,787,000)
Treasury shares 1,511,146,000   1,339,197,000
Market Value Of Treasury Shares 1,536,826,000 1,934,010,000 1,934,010,000
Exercised (20,251,000) R$ (54,213,000)  
Repurchase 191,918,000   2,806,764,000
Canceled     (3,238,200,000)
Market Value Of Treasury Shares R$ 1,444,574,000   R$ 1,536,826,000