Pension plan obligations (Details) - BRL (R$) R$ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| IfrsStatementLineItems [Line Items] | |||
| Present value of defined benefit obligations | R$ (4,771,837) | R$ (4,267,083) | R$ (5,081,485) |
| Fair value of the plan's assets | 2,631,676 | 2,468,182 | |
| Asset ceiling | (132,244) | ||
| Total pension plan obligations (deficit) | (2,140,161) | (1,931,145) | |
| G 1 Plan [Member] | |||
| IfrsStatementLineItems [Line Items] | |||
| Present value of defined benefit obligations | (2,731,190) | (2,335,938) | (2,982,863) |
| Fair value of the plan's assets | 2,631,676 | 2,468,182 | |
| Asset ceiling | (132,244) | ||
| Total pension plan obligations (deficit) | (99,514) | ||
| G 0 Plan [Member] | |||
| IfrsStatementLineItems [Line Items] | |||
| Present value of defined benefit obligations | (2,040,647) | (1,931,145) | R$ (2,098,622) |
| Fair value of the plan's assets | |||
| Asset ceiling | |||
| Total pension plan obligations (deficit) | R$ (2,040,647) | R$ (1,931,145) |