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Financial instruments - Outstanding assets and liabilities derivatives positions (Details) - BRL (R$) R$ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Disclosure of detailed information about financial instruments [line items] |  |
Fair value in R$ | R$ 493,113 | R$ (6,567,720)
Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Fair value in R$ | (710,040) | (1,843,085)
Operational Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Fair value in R$ | 1,104,123 | (4,660,846)
Commodity Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Fair value in R$ | 99,030 | (63,789)
Zero cost collar (U.S.$ x R$) | Operational Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 5,962,800 | 6,852,200
Fair value in R$ | 1,075,688 | (4,328,970)
Zero cost collar (U.S.$ x R$) | Commodity Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 252,089 | 163,941
Fair value in R$ | 1,285 | 6,097
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
NDF (CNY x US$) | Operational Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,500 |
Fair value in R$ | (7) |
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 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 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 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 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 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 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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