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Financial instruments - Outstanding derivatives by contract type, including embedded derivatives (Details) R$ in Thousands, $ in Thousands | Sep. 30, 2025 BRL (R$) | Sep. 30, 2025 USD ($) | 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$ 493,113 |  | R$ (6,567,720) |
Derivative financial instruments | 1,363,240 |  | 1,006,427 |
Derivative financial instruments | 6,753,164 |  | 2,880,673 |
Current derivative financial liabilities | (1,188,743) |  | (2,760,273) |
Non-current derivative financial liabilities | (6,434,548) |  | (7,694,547) |
Operational Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Fair value in R$ | 1,104,123 |  | (4,660,846) |
Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Fair value in R$ | (710,040) |  | (1,843,085) |
Commodity Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Fair value in R$ | 99,030 |  | (63,789) |
NDF (R$ x US$) | Operational Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 90,000 |  | 581,000 |
Fair value in R$ | 28,442 |  | (331,876) |
Swap US$ e US-CPI (1) | Commodity Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 153,273 |  | 138,439 |
Fair value in R$ | 99,383 |  | (80,759) |
Swap VLSFO/Brent | Commodity Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 5,888 |  | 39,706 |
Fair value in R$ | (1,638) |  | 10,873 |
Interest rate swap contract [member] | Zero Cost Collar | Operational Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | $ 5,962,800 |  | $ 6,852,200
Fair value in R$ | 1,075,688 |  | (4,328,970) |
Interest rate swap contract [member] | Zero Cost Collar | Commodity Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | 252,089 |  | 163,941
Fair value in R$ | 1,285 |  | 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$ | 28,442 |  | (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$ | (7) |  |  |
Interest rate swap contract [member] | Swap SOFR x Fixed (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | 2,015,371 |  | 1,973,705
Fair value in R$ | 132,462 |  | 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 | $ |  | 10,137,136 |  | 8,128,395
Fair value in R$ | (788,468) |  | (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 | $ |  | 1,607,213 |  | 909,612
Fair value in R$ | (25,130) |  | (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 | $ |  | 660,171 |  | 610,171
Fair value in R$ | (52,823) |  | (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 | $ |  | 153,273 |  | 138,439
Fair value in R$ | 99,383 |  | (80,759) |
Interest rate swap contract [member] | Swap VLSFO/Brent | Commodity Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | 5,888 |  | 39,706
Fair value in R$ | (1,637) |  | 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$ | (2,687) |  | (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 | $ |  | $ 2,400,000 |  |
Fair value in R$ | 26,605 |  |  |
Derivative Assets | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Fair value in R$ | 6,416,177 |  | 3,594,291 |
Derivative Assets | Swap SOFR x Fixed (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 2,015,371 |  | 1,973,705 |
Fair value in R$ | 291,321 |  | 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 | 10,657,886 |  | 8,382,699 |
Fair value in R$ | 1,382,291 |  | 927,586 |
Derivative Assets | Swap CDI x Fixed (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 8,579,548 |  | 4,748,394 |
Fair value in R$ | 2,213,625 |  | 1,482,759 |
Derivative Assets | Swap CDI x SOFR (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 3,399,600 |  | 3,117,625 |
Fair value in R$ | 981,679 |  | 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$ | 28,453 |  |  |
Derivative Assets | Pre-fixed Swap to CDI US$ | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 2,400,000 |  |  |
Fair value in R$ | 1,518,808 |  |  |
Derivative Liabilities | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Fair value in R$ | (7,126,217) |  | (5,437,376) |
Derivative Liabilities | Swap SOFR x Fixed (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 2,015,371 |  | 1,973,705 |
Fair value in R$ | (158,858) |  | (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 | 10,137,136 |  | 8,128,395 |
Fair value in R$ | (2,170,759) |  | (1,753,485) |
Derivative Liabilities | Swap CDI x Fixed (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 1,607,213 |  | 909,612 |
Fair value in R$ | (2,238,755) |  | (2,259,020) |
Derivative Liabilities | Swap CDI x SOFR (US$) | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 660,171 |  | 610,171 |
Fair value in R$ | (1,034,502) |  | (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$ | (31,140) |  | R$ (6,440) |
Derivative Liabilities | Pre-fixed Swap to CDI US$ | Debt hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 2,400,000 |  |  |
Fair value in R$ | R$ (1,492,203) |  |  |

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