Shareholders equity - Treasury shares (Details) - BRL (R$) |
9 Months Ended | 12 Months Ended | |
|---|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2024 |
Dec. 31, 2024 |
|
| Disclosure of classes of share capital [line items] | |||
| Balance, Beginning of the period | 24,875,787,000 | 34,765,600,000 | 34,765,600,000 |
| Exercised | (372,160,000) | (1,005,113,000) | |
| Repurchase | 3,705,200,000 | 51,115,300,000 | |
| Stock canceled During Period, Shares | (60,000,000,000) | ||
| Treasury Stock, Number of Shares | 28,208,827,000 | 24,875,787,000 | |
| Weighted Average Price Per Share, Treasury Shares | R$ 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 | 2,806,764,000 | 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$ 1,407,620,000 | R$ 1,536,826,000 | |