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INTANGIBLE - Goodwill and intangible assets with indefinite useful life (Details) - BRL (R$)
R$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Disclosure of detailed information about intangible assets [line items]    
Intangible Assets and Goodwill with Indefinite Useful Life R$ 8,192,076 R$ 8,192,076
Goodwill - Facepa    
Disclosure of detailed information about intangible assets [line items]    
Intangible Assets and Goodwill with Indefinite Useful Life 119,332 119,332
Goodwill - 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    
Disclosure of detailed information about intangible assets [line items]    
Intangible Assets and Goodwill with Indefinite Useful Life 170,859 170,859
Other    
Disclosure of detailed information about intangible assets [line items]    
Intangible Assets and Goodwill with Indefinite Useful Life R$ 4,834 R$ 4,834