Trade accounts receivable (Details) - BRL (R$) R$ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| IfrsStatementLineItems [Line Items] | ||
| Trade accounts receivable | R$ 5,039,083 | R$ 4,815,750 |
| Other accounts receivable | 5,741,906 | 5,486,319 |
| Provision for expected credit losses | (702,823) | (670,569) |
| Current portion | (4,901,777) | (4,677,935) |
| Non-current portion | 137,306 | 137,815 |
| Billed Services [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Other accounts receivable | 2,695,504 | 2,481,786 |
| Unbilled Services [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Other accounts receivable | 1,418,994 | 1,302,906 |
| Network Use [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Other accounts receivable | 997,297 | 992,414 |
| Goods Sold [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Other accounts receivable | 603,882 | 684,858 |
| Contract assets [member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Other accounts receivable | 25,898 | 24,027 |
| Other Accounts Receivable [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Other accounts receivable | R$ 331 | R$ 328 |