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Financial instruments - Outstanding assets and liabilities derivatives positions (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of detailed information about financial instruments [line items] |  |
Fair value in R$ | R$ (6,567,720) | R$ 1,994,382
Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Fair value in R$ | (1,843,085) | (486,713)
Operational Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Fair value in R$ | (4,660,846) | 2,231,475
Commodity Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Fair value in R$ | (63,789) | 249,620
Zero cost collar (U.S.$ x R$) | Operational Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 6,852,200 | 4,500,200
Fair value in R$ | (4,328,970) | 1,968,337
Zero cost collar (U.S.$ x R$) | Commodity Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 163,941 | 163,100
Fair value in R$ | 6,097 | (3,148)
NDF (R$ x US$) | Operational Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 581,000 | 505,000
Fair value in R$ | (331,876) | 162,776
NDF (€ x US$) | Operational Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value |  | 262,088
Fair value in R$ |  | 100,362
Swap US$ e US-CPI (1) | Commodity Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 138,439 | 131,510
Fair value in R$ | (80,759) | 230,471
Swap VLSFO/Brent | Commodity Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 39,706 | 142,794
Fair value in R$ | 10,873 | 22,297
Derivative Assets | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Fair value in R$ | 3,594,291 | 1,529,543
Derivative Assets | Swap CDI x Fixed (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 4,748,394 | 3,898,011
Fair value in R$ | 1,482,759 | 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 in R$ |  |
Derivative Assets | Swap SOFR to Fixed (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 1,973,705 | 2,555,626
Fair value in R$ | 424,824 | 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 | 8,382,699 | 4,320,471
Fair value in R$ | 927,586 | 161,542
Derivative Assets | Swap CDI x SOFR (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 3,117,625 | 644,850
Fair value in R$ | 754,173 | 32,560
Derivative Assets | Swap SOFR to SOFR (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 150,961 | 150,961
Fair value in R$ | 4,949 | 6,681
Derivative Liabilities | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Fair value in R$ | (5,437,376) | (2,016,256)
Derivative Liabilities | Swap CDI x Fixed (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 909,612 | 1,025,000
Fair value in R$ | (2,259,020) | (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 in R$ |  | (203,045)
Derivative Liabilities | Swap SOFR to Fixed (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 1,973,705 | 2,555,626
Fair value in R$ | (30,695) | (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 | 8,128,395 | 4,274,397
Fair value in R$ | (1,753,485) | (113,897)
Derivative Liabilities | Swap CDI x SOFR (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 610,171 | 125,000
Fair value in R$ | (1,344,937) | (6,786)
Derivative Liabilities | Swap SOFR to SOFR (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional value | 150,961 | 150,961
Fair value in R$ | R$ (42,799) | R$ (23,296)

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