v3.26.1
Financial instruments and risk management - Outstanding assets and liabilities derivatives positions (Details)
¥ in Thousands, R$ in Thousands, $ in Thousands
Mar. 31, 2026
BRL (R$)
Mar. 31, 2026
USD ($)
Mar. 31, 2026
CNY (¥)
Dec. 31, 2025
BRL (R$)
Dec. 31, 2025
USD ($)
Dec. 31, 2025
CNY (¥)
Disclosure of detailed information about financial instruments [line items]            
Fair value in R$ R$ 3,314,002     R$ 230,312    
Debt hedges            
Disclosure of detailed information about financial instruments [line items]            
Fair value in R$ 476,471     (851,427)    
Operational Hedge            
Disclosure of detailed information about financial instruments [line items]            
Fair value in R$ 2,432,991     1,004,060    
Commodity Hedge            
Disclosure of detailed information about financial instruments [line items]            
Fair value in R$ 404,540     77,679    
Zero cost collar (U.S.$ x R$) | Operational Hedge            
Disclosure of detailed information about financial instruments [line items]            
Notional amount | $   $ 5,574,300     $ 6,156,400  
Fair value in R$ 2,389,964     979,705    
Zero cost collar (U.S.$ x R$) | Commodity Hedge            
Disclosure of detailed information about financial instruments [line items]            
Notional amount | $   335,511     359,677  
Fair value in R$ 378,898     (33,279)    
NDF (R$ x US$) | Operational Hedge            
Disclosure of detailed information about financial instruments [line items]            
Notional amount | $   63,000     90,000  
Fair value in R$ 43,027     24,355    
Swap US$ e US-CPI (1) | Commodity Hedge            
Disclosure of detailed information about financial instruments [line items]            
Notional amount | $   154,602     153,342  
Fair value in R$ 25,642     112,058    
Swap VLSFO/Brent | Commodity Hedge            
Disclosure of detailed information about financial instruments [line items]            
Notional amount | $       1,217  
Fair value in R$     (1,100)    
Derivative Assets | Debt hedges            
Disclosure of detailed information about financial instruments [line items]            
Fair value in R$ 8,312,377     7,554,745    
Derivative Assets | Swap CDI x Fixed (US$) | Debt hedges            
Disclosure of detailed information about financial instruments [line items]            
Notional amount 9,081,789     8,788,534    
Fair value in R$ 2,752,897     2,525,172    
Derivative Assets | Swap SOFR x Fixed (US$) | Debt hedges            
Disclosure of detailed information about financial instruments [line items]            
Notional amount | $   2,464,149     2,400,260  
Fair value in R$ 511,285     492,458    
Derivative Assets | Swap IPCA x CDI (notional in Brazilian Reais) | Debt hedges            
Disclosure of detailed information about financial instruments [line items]            
Notional amount 13,622,944     11,059,169    
Fair value in R$ 1,960,902     1,549,779    
Derivative Assets | Swap CDI x SOFR (US$) | Debt hedges            
Disclosure of detailed information about financial instruments [line items]            
Notional amount 3,399,600     3,399,600    
Fair value in R$ 971,697     915,431    
Derivative Assets | Swap CNY to Fixed | Debt hedges            
Disclosure of detailed information about financial instruments [line items]            
Notional amount | ¥     ¥ 2,600,000     ¥ 2,600,000
Fair value in R$ 528,655     509,116    
Derivative Assets | Pre-fixed Swap to CDI US$ | Debt hedges            
Disclosure of detailed information about financial instruments [line items]            
Notional amount 2,400,000     2,400,000    
Fair value in R$ 1,586,941     1,562,789    
Derivative Liabilities | Debt hedges            
Disclosure of detailed information about financial instruments [line items]            
Fair value in R$ (7,835,906)     (8,406,172)    
Derivative Liabilities | Swap CDI x Fixed (US$) | Debt hedges            
Disclosure of detailed information about financial instruments [line items]            
Notional amount | $   1,691,530     1,635,783  
Fair value in R$ (2,273,041)     (2,686,614)    
Derivative Liabilities | Swap SOFR x Fixed (US$) | Debt hedges            
Disclosure of detailed information about financial instruments [line items]            
Notional amount | $   2,464,149     2,400,260  
Fair value in R$ (358,788)     (400,210)    
Derivative Liabilities | Swap IPCA x CDI (notional in Brazilian Reais) | Debt hedges            
Disclosure of detailed information about financial instruments [line items]            
Notional amount 12,896,320     10,466,620    
Fair value in R$ (2,533,338)     (2,210,556)    
Derivative Liabilities | Swap CDI x SOFR (US$) | Debt hedges            
Disclosure of detailed information about financial instruments [line items]            
Notional amount | $   660,171     660,171  
Fair value in R$ (891,382)     (1,080,537)    
Derivative Liabilities | Swap CNY to Fixed | Debt hedges            
Disclosure of detailed information about financial instruments [line items]            
Notional amount | $   $ 362,736     $ 362,736  
Fair value in R$ (449,939)     (473,828)    
Derivative Liabilities | Pre-fixed Swap to CDI US$ | Debt hedges            
Disclosure of detailed information about financial instruments [line items]            
Notional amount 2,400,000     2,400,000    
Fair value in R$ R$ (1,329,418)     R$ (1,554,427)