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Financial instruments - Outstanding derivatives by contract type, including embedded derivatives (Details) R$ in Thousands, $ in Thousands | Jun. 30, 2024 BRL (R$) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 BRL (R$) | Dec. 31, 2023 USD ($)
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Disclosure of detailed information about financial instruments [line items] |  |  |  |
Fair value | R$ (1,847,708) |  | R$ 1,994,382 |
Derivative financial instruments | 1,161,258 |  | 2,676,526 |
Derivative financial instruments | 2,723,363 |  | 1,753,928 |
Current derivative financial liabilities | (469,544) |  | (578,763) |
Non-current derivative financial liabilities | (5,262,785) |  | (1,857,309) |
Operational Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Fair value | (1,401,797) |  | 2,231,475 |
Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Fair value | (589,915) |  | (486,713) |
Commodity Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Fair value | 144,004 |  | 249,620 |
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 |
Interest rate swap contract [member] | Zero Cost Collar | 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 |
Interest rate swap contract [member] | Zero Cost Collar | Commodity Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional value | $ |  | 121,865 |  | 163,100
Fair value | 30,535 |  | (3,148) |
Interest rate swap contract [member] | 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 |
Interest rate swap contract [member] | 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 |
Interest rate swap contract [member] | 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 | 391,912 |  | 741,492 |
Interest rate swap contract [member] | 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 | (364,433) |  | 47,645 |
Interest rate swap contract [member] | 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 | (318,356) |  | (1,081,964) |
Interest rate swap contract [member] | Pre-fixed Swap to US$ (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional value | $ |  |  |  | 200,000
Fair value |  |  | (203,045) |
Interest rate swap contract [member] | Swap CDI x SOFR (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional value | $ |  | 610,171 |  | 125,000
Fair value | (277,115) |  |  | 25,774
Interest rate swap contract [member] | Swap SOFR to SOFR (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional value | $ |  | 150,961 |  | 150,961
Fair value | (21,923) |  |  | (16,615)
Interest rate swap contract [member] | 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 |
Interest rate swap contract [member] | Swap VLSFO/Brent | Commodity Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional value | $ |  | $ 76,684 |  | $ 142,794
Fair value | R$ 46,524 |  | R$ 22,297 |

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