v3.25.4
Financial instruments - Fair value settled amounts (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement R$ 530,655 R$ (550,581)
Operational Hedge    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement (5,492) 650,845
Commodity Hedge    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement (712) 89,327
Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement 536,859 (1,290,753)
Zero cost collar (R$ x U.S.$) | Operational Hedge    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement 9,922 645,759
NDF (R$ x US$) | Operational Hedge    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement (15,388) (68,695)
NDF (CNY x US$) | Operational Hedge    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement (26) 73,781
Swap VLSFO/other | Commodity Hedge    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement (712) 89,327
Swap CDI x Fixed (US$) | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement 408,373 (1,635,058)
Swap IPCA x CDI (notional in Brazilian Reais) | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement (321,139) (59,243)
Swap IPCA to Fixed (US$) | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement (16,455)
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)
Swap SOFR x SOFR (US$) | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement 1,504
Swap SOFR x Fixed (US$) | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement 212,326 19,074
Swap SOFR x Fixed (US$) | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement R$ 252,250 R$ 603,737