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Cash and cash equivalents, margin cash and long-term investments
 6 Months Ended
Jun. 30, 2026
Cash and cash equivalents [abstract]  
Cash and cash equivalents, margin cash and long-term investments Cash and cash equivalents, margin cash and long-term investments
Cash and cash equivalentsJune 30, 2026December 31, 2025
Cash on hand and at banks1,259,842 2,557,740 
CDB (bank certificates of deposit) / Overnight investments2,146,796 1,937,761 
National Treasury Bill (Tesouro Selic)
62,482 69,635 
3,469,120 4,565,136 
Margin cash
CME (Chicago Mercantile Exchange) Margin investments75,297 105,993 
Investments in Treasury Bills93,004 53,569 
168,301 159,562 
Long-term investments
Investment funds50,949 45,780 
50,949 45,780 
Total3,688,370 4,770,478