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Provision for judicial liabilities - Contingencies with possible losses (Details) - BRL (R$)
R$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Fibria    
Disclosure of other provisions [line items]    
Fair Value Adjustment Of Probable Contingencies R$ 2,088,587 R$ 2,108,635
Total    
Disclosure of other provisions [line items]    
Possible Losses for Which No Provision Was Recorded 11,545,442 15,074,276
Taxes and social security (1)    
Disclosure of other provisions [line items]    
Possible Losses for Which No Provision Was Recorded 10,329,685 9,837,082
Labor    
Disclosure of other provisions [line items]    
Possible Losses for Which No Provision Was Recorded 186,654 171,480
Civil and environmental (1) (2)    
Disclosure of other provisions [line items]    
Possible Losses for Which No Provision Was Recorded R$ 1,029,103 R$ 5,065,714