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Financial instruments - Outstanding assets and liabilities derivatives positions (Details) - BRL (R$)
R$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
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)