INTANGIBLE - Goodwill and intangible assets with indefinite useful life (Details) - BRL (R$) R$ in Thousands |
Sep. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of detailed information about intangible assets [line items] | ||
| Intangible Assets and Goodwill with Indefinite Useful Life | R$ 8,192,339 | R$ 8,192,339 |
| Goodwill - Facepa | ||
| Disclosure of detailed information about intangible assets [line items] | ||
| Intangible Assets and Goodwill with Indefinite Useful Life | 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 | ||
| Disclosure of detailed information about intangible assets [line items] | ||
| Intangible Assets and Goodwill with Indefinite Useful Life | 170,859 | 170,859 |
| Other (1) | ||
| Disclosure of detailed information about intangible assets [line items] | ||
| Intangible Assets and Goodwill with Indefinite Useful Life | R$ 5,097 | R$ 5,097 |