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Provision for judicial liabilities - Contingencies with possible losses (Details) - BRL (R$) R$ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Fibria |  |
Disclosure of other provisions [line items] |  |
Fair Value Adjustment Of Probable Contingencies | R$ 2,095,571 | R$ 2,108,635
Total |  |
Disclosure of other provisions [line items] |  |
Possible Losses for Which No Provision Was Recorded | 11,350,062 | 15,074,276
Taxes and social security (1) |  |
Disclosure of other provisions [line items] |  |
Possible Losses for Which No Provision Was Recorded | 10,137,662 | 9,837,082
Labor |  |
Disclosure of other provisions [line items] |  |
Possible Losses for Which No Provision Was Recorded | 175,800 | 171,480
Civil and environmental (1) (2) |  |
Disclosure of other provisions [line items] |  |
Possible Losses for Which No Provision Was Recorded | R$ 1,036,600 | R$ 5,065,714

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