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INTANGIBLE - Goodwill and intangible assets with indefinite useful life (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about intangible assets [line items]    
Intangible Assets and Goodwill with Indefinite Useful Life R$ 8,192,339 R$ 8,192,076
Growth rate used to extrapolate cash flow projections 3.60%  
Discount rate used in current estimate of value in use 8.91%  
Goodwill - Facepa    
Disclosure of detailed information about intangible assets [line items]    
Intangible Assets and Goodwill with Indefinite Useful Life R$ 119,332 119,332
Fibria    
Disclosure of detailed information about intangible assets [line items]    
Intangible Assets and Goodwill with Indefinite Useful Life 7,897,051 7,897,051
Goodwill - MMC Brasil (1)    
Disclosure of detailed information about intangible assets [line items]    
Intangible Assets and Goodwill with Indefinite Useful Life 170,859 170,859
Other (2)    
Disclosure of detailed information about intangible assets [line items]    
Intangible Assets and Goodwill with Indefinite Useful Life R$ 5,097 R$ 4,834