Contract assets and other concession assets (Details) - BRL (R$) R$ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Contract Assets And Other Concession Assets | ||
| Contract assets, beginning | R$ 4,877,667 | R$ 7,393,096 |
| Additions | 16,684,564 | 6,675,914 |
| Write-offs | (62,684) | (164,022) |
| Transfers | 24,108 | 5,796 |
| Transfers of works to intangible assets | (8,117,869) | (7,455,330) |
| Transfers of works to financial asset of the concession | (2,387,270) | (1,577,787) |
| Contract assets, ending | R$ 11,018,516 | R$ 4,877,667 |