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Provision for judicial liabilities - Contingencies with possible losses (Details) - BRL (R$) R$ in Thousands	Jun. 30, 2025	Dec. 31, 2024
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