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Financial instruments - Risk classification of trade accounts receivable (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Disclosure of internal credit grades [line items] |  |  |
Expected credit losses | R$ 97,934 | R$ 95,053 | R$ 105,989
Trade accounts receivable |  |  |
Disclosure of internal credit grades [line items] |  |  |
Expected credit losses | 30,300 | 31,962 | R$ 21,109
Trade accounts receivable | Credit risk [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit risk exposure | 9,163,160 | 6,880,416 |
Expected credit losses | 30,300 | 31,962 |
Trade accounts receivable | Credit risk [member] | Low Risk | Current and overdue to up 30 days |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit risk exposure | 8,899,516 | 6,549,975 |
Trade accounts receivable | Credit risk [member] | Average Risk | Later than one month and not later than three months [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit risk exposure | 174,048 | 156,883 |
Trade accounts receivable | Credit risk [member] | High Risk | Overdue more than 90 days |  |  |
Disclosure of internal credit grades [line items] |  |  |
Credit risk exposure | R$ 89,596 | R$ 173,558 |

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