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Financial instruments - Fair value settled amounts (Details) - BRL (R$) R$ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2024 | Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | R$ (682,787) | R$ 3,559,286
Operational Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | 677,720 | 3,227,743
Commodity Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | 63,904 | 80,516
Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | (1,424,411) | 251,027
Zero cost collar (R$ x U.S.$) | Operational Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | 580,961 | 2,987,953
NDF (R$ x US$) | Operational Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | 39,368 | 155,458
NDF (€ x US$) | Operational Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | 57,391 | 84,332
Swap VLSFO/other | Commodity Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | 63,904 | 80,516
Swap CDI x Fixed (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | (1,562,218) | (438,417)
Swap IPCA to CDI (notional in Brazilian Reais) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | (14,722) | 256,683
Swap IPCA to Fixed (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement |  | 21,139
Swap Pre-Fixed to US$ | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | (221,462) | (104,827)
Swap SOFR to SOFR (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | 800 |
Swap SOFR to Fixed (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | (22,911) | 7,729
Swap SOFR to Fixed (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | R$ 396,102 | R$ 508,720

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