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Financial instruments - Outstanding derivatives by contract type, including embedded derivatives (Details) R$ in Thousands, $ in Thousands | Jun. 30, 2025 BRL (R$) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 BRL (R$) | Dec. 31, 2024 USD ($)
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Disclosure of detailed information about financial instruments [line items] |  |  |  |
Fair value in R$ | R$ (494,493) |  | R$ (6,567,720) |
Derivative financial instruments | 1,100,397 |  | 1,006,427 |
Derivative financial instruments | 4,055,943 |  | 2,880,673 |
Current derivative financial liabilities | (1,044,493) |  | (2,760,273) |
Non-current derivative financial liabilities | (4,606,340) |  | (7,694,547) |
Operational Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Fair value in R$ | 297,769 |  | (4,660,846) |
Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Fair value in R$ | (873,360) |  | (1,843,085) |
Commodity Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Fair value in R$ | 81,098 |  | (63,789) |
NDF (R$ x US$) | Operational Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 90,000 |  | 581,000 |
Fair value in R$ | 7,419 |  | (331,876) |
Swap US$ e US-CPI (1) | Commodity Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 138,182 |  | 138,439 |
Fair value in R$ | 94,560 |  | (80,759) |
Swap VLSFO/Brent | Commodity Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 13,518 |  | 39,706 |
Fair value in R$ | 117 |  | 10,873 |
Interest rate swap contract [member] | Zero Cost Collar | Operational Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | $ 6,844,400 |  | $ 6,852,200
Fair value in R$ | 290,364 |  | (4,328,970) |
Interest rate swap contract [member] | Zero Cost Collar | Commodity Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | 306,998 |  | 163,941
Fair value in R$ | (13,579) |  | 6,097 |
Interest rate swap contract [member] | NDF (R$ x US$) | Operational Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | 90,000 |  | 581,000
Fair value in R$ | 7,419 |  | (331,876) |
Interest rate swap contract [member] | NDF (CNY x US$) | Operational Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | 1,500 |  |
Fair value in R$ | (14) |  |  |
Interest rate swap contract [member] | Swap SOFR x Fixed (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | 1,576,482 |  | 1,973,705
Fair value in R$ | 112,139 |  | 394,129 |
Interest rate swap contract [member] | Swap IPCA x CDI (notional in Brazilian Reais) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | 8,011,292 |  | 8,128,395
Fair value in R$ | (517,031) |  | (825,899) |
Interest rate swap contract [member] | Swap CDI x Fixed (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | 1,084,612 |  | 909,612
Fair value in R$ | (351,438) |  | (776,261) |
Interest rate swap contract [member] | Swap CDI x SOFR (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | 635,171 |  | 610,171
Fair value in R$ | (164,140) |  |  | (590,764)
Interest rate swap contract [member] | Swap SOFR x SOFR (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  |  |  | 150,961
Fair value in R$ |  |  |  | (37,850)
Interest rate swap contract [member] | Swap US$ e US-CPI (1) | Commodity Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | 138,182 |  | 138,439
Fair value in R$ | 94,560 |  | (80,759) |
Interest rate swap contract [member] | Swap VLSFO/Brent | Commodity Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | 13,518 |  | 39,706
Fair value in R$ | 117 |  | 10,873 |
Interest rate swap contract [member] | Swap CNY to Fixed | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | 165,815 |  | 165,815
Fair value in R$ | (311) |  | (6,440) |
Interest rate swap contract [member] | Pre-fixed Swap to CDI US$ | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | $ 2,702,972 |  |
Fair value in R$ | 47,421 |  |  |
Derivative Assets | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Fair value in R$ | 3,744,385 |  | 3,594,291 |
Derivative Assets | Swap SOFR x Fixed (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 1,576,482 |  | 1,973,705 |
Fair value in R$ | 263,803 |  | 424,824 |
Derivative Assets | Swap IPCA x CDI (notional in Brazilian Reais) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 8,508,353 |  | 8,382,699 |
Fair value in R$ | 877,583 |  | 927,586 |
Derivative Assets | Swap CDI x Fixed (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 5,672,695 |  | 4,748,394 |
Fair value in R$ | 1,343,712 |  | 1,482,759 |
Derivative Assets | Swap CDI x SOFR (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 3,260,425 |  | 3,117,625 |
Fair value in R$ | 872,515 |  | 754,173 |
Derivative Assets | Swap SOFR x SOFR (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount |  |  | 150,961 |
Fair value in R$ |  |  | 4,949 |
Derivative Assets | Swap CNY to Fixed | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 1,200,000 |  | 1,200,000 |
Fair value in R$ | 31,144 |  |  |
Derivative Assets | Pre-fixed Swap to CDI US$ | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 2,700,000 |  |  |
Fair value in R$ | 355,628 |  |  |
Derivative Liabilities | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Fair value in R$ | (4,617,745) |  | (5,437,376) |
Derivative Liabilities | Swap SOFR x Fixed (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 1,576,482 |  | 1,973,705 |
Fair value in R$ | (151,664) |  | (30,695) |
Derivative Liabilities | Swap IPCA x CDI (notional in Brazilian Reais) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 8,011,292 |  | 8,128,395 |
Fair value in R$ | (1,394,614) |  | (1,753,485) |
Derivative Liabilities | Swap CDI x Fixed (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 1,084,612 |  | 909,612 |
Fair value in R$ | (1,695,150) |  | (2,259,020) |
Derivative Liabilities | Swap CDI x SOFR (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 635,171 |  | 610,171 |
Fair value in R$ | (1,036,655) |  | (1,344,937) |
Derivative Liabilities | Swap SOFR x SOFR (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount |  |  | 150,961 |
Fair value in R$ |  |  | (42,799) |
Derivative Liabilities | Swap CNY to Fixed | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 165,815 |  | 165,815 |
Fair value in R$ | (31,455) |  | R$ (6,440) |
Derivative Liabilities | Pre-fixed Swap to CDI US$ | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 2,700,000 |  |  |
Fair value in R$ | R$ (308,207) |  |  |

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