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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 |  |  |  |

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