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Investments - Investments in Associates and Joint Ventures (Details) R$ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2024 BRL (R$) | Jun. 30, 2023 BRL (R$) | Jun. 30, 2024 BRL (R$) | Jun. 30, 2023 BRL (R$) | Jun. 30, 2024 EUR (€) | Dec. 31, 2023 BRL (R$) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 BRL (R$)
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Equity | R$ 40,614,195 | R$ 42,700,013 | R$ 40,614,195 | R$ 42,700,013 |  | R$ 44,810,300 |  | R$ 33,166,365
Income (expenses) of the period | (3,765,517) | R$ 5,077,623 | (3,545,485) | 10,320,416 |  |  |  |
Carrying amount | 427,851 |  | 427,851 |  |  | 379,126 |  |
In the income (expenses) for the period |  |  | (3,514) | 419 |  |  |  |
Average share price quoted on the NFNGM | € |  |  |  |  | € 1.60 |  | € 2.40 |
Associate | Foreign |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Carrying amount | 97,942 |  | 97,942 |  |  | 96,123 |  |
In the income (expenses) for the period |  |  | (9,235) | (11,010) |  |  |  |
Ensyn Corporation | Foreign |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Equity | 1,112 |  | 1,112 |  |  |  |  |
Income (expenses) of the period |  |  | R$ (663) |  |  |  |  |
Participation equity (%) |  |  | 25.53% |  |  |  |  |
Carrying amount | 284 |  | R$ 284 |  |  | 387 |  |
In the income (expenses) for the period |  |  | (170) | (4,304) |  |  |  |
Spinnova Plc | Foreign |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Equity | 520,012 |  | 520,012 |  |  |  |  |
Income (expenses) of the period |  |  | R$ (10,088) |  |  |  |  |
Participation equity (%) |  |  | 18.77% |  |  |  |  |
Carrying amount | 97,658 |  | R$ 97,658 |  |  | 95,736 |  |
In the income (expenses) for the period |  |  | (9,065) | (6,706) |  |  |  |
Joint ventures |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Carrying amount | 298,545 |  | 298,545 |  |  | 259,397 |  |
In the income (expenses) for the period |  |  | 5,721 | 11,661 |  |  |  |
Biomas | Domestic (Brazil) |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Equity | 29,781 |  | 29,781 |  |  |  |  |
Income (expenses) of the period |  |  | R$ (12,923) |  |  |  |  |
Participation equity (%) |  |  | 16.66% |  |  |  |  |
Carrying amount | 4,962 |  | R$ 4,962 |  |  | 2,797 |  |
In the income (expenses) for the period |  |  | (2,001) | (175) |  |  |  |
Ibema Companhia Brasileira de Papel | Domestic (Brazil) |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Equity | 352,189 |  | 352,189 |  |  |  |  |
Income (expenses) of the period |  |  | R$ 38,156 |  |  |  |  |
Participation equity (%) |  |  | 49.90% |  |  |  |  |
Carrying amount | 175,742 |  | R$ 175,742 |  |  | 156,703 |  |
In the income (expenses) for the period |  |  | 19,040 | 21,524 |  |  |  |
F&E Technologies LLC | Foreign |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Equity | 11,451 |  | 11,451 |  |  |  |  |
Income (expenses) of the period |  |  |  |  |  |  |  |
Participation equity (%) |  |  | 50.00% |  |  |  |  |
Carrying amount | 5,726 |  | R$ 5,726 |  |  | 4,987 |  |
In the income (expenses) for the period |  |  |  |  |  |  |  |
Woodspin Oy | Foreign |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Equity | 224,231 |  | 224,231 |  |  |  |  |
Income (expenses) of the period |  |  | R$ (22,275) |  |  |  |  |
Participation equity (%) |  |  | 50.00% |  |  |  |  |
Carrying amount | 112,115 |  | R$ 112,115 |  |  | 94,910 |  |
In the income (expenses) for the period |  |  | (11,318) | (9,688) |  |  |  |
Other investments evaluated at fair value through other comprehensive income |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Carrying amount | R$ 31,364 |  | 31,364 |  |  | R$ 23,606 |  |
In the income (expenses) for the period |  |  |  | R$ (232) |  |  |  |

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