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Financial instruments - Outstanding assets and liabilities derivatives positions (Details) - BRL (R$) R$ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Disclosure of detailed information about financial instruments [line items] |  |
Fair value | R$ (1,847,708) | R$ 1,994,382
Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Fair value | (589,915) | (486,713)
Operational Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Fair value | (1,401,797) | 2,231,475
Commodity Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Fair value | 144,004 | 249,620
Zero cost collar (U.S.$ x R$) | Operational Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 6,547,200 | 4,500,200
Fair value | (1,333,266) | 1,968,337
Zero cost collar (U.S.$ x R$) | Commodity Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 121,865 | 163,100
Fair value | 30,535 | (3,148)
NDF (R$ x US$) | Operational Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 357,500 | 505,000
Fair value | (77,902) | 162,776
NDF (€ x US$) | Operational Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 68,512 | 262,088
Fair value | 9,371 | 100,362
Swap US-CPI standing wood | Commodity Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 139,342 | 131,510
Fair value | 66,945 | 230,471
Swap VLSFO/Brent | Commodity Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 76,684 | 142,794
Fair value | 46,524 | 22,297
Derivative Assets | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Fair value | 3,044,266 | 1,529,543
Derivative Assets | Swap CDI x Fixed (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 4,748,394 | 3,898,011
Fair value | 1,618,434 | 223,776
Derivative Assets | Swap Pre-Fixed to US$ | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value |  | 738,800
Fair value |  |
Derivative Assets | Swap SOFR to Fixed (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 1,437,593 | 2,555,626
Fair value | 430,489 | 1,104,984
Derivative Assets | Swap IPCA to CDI (notional in Brazilian Reais) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 5,229,379 | 4,320,471
Fair value | 308,989 | 161,542
Derivative Assets | Swap CDI x SOFR (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 3,117,625 | 644,850
Fair value | 679,637 | 32,560
Derivative Assets | Swap SOFR to SOFR (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 150,961 | 150,961
Fair value | 6,717 | 6,681
Derivative Liabilities | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Fair value | (3,634,181) | (2,016,256)
Derivative Liabilities | Swap CDI x Fixed (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 909,612 | 1,025,000
Fair value | (1,936,790) | (1,305,740)
Derivative Liabilities | Swap Pre-Fixed to US$ | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value |  | 200,000
Fair value |  | (203,045)
Derivative Liabilities | Swap SOFR to Fixed (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 1,437,593 | 2,555,626
Fair value | (38,577) | (363,492)
Derivative Liabilities | Swap IPCA to CDI (notional in Brazilian Reais) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 5,078,782 | 4,274,397
Fair value | (673,422) | (113,897)
Derivative Liabilities | Swap CDI x SOFR (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 610,171 | 125,000
Fair value | (956,752) | (6,786)
Derivative Liabilities | Swap SOFR to SOFR (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 150,961 | 150,961
Fair value | R$ (28,640) | R$ (23,296)

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