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INVESTMENTS - Investments in associates and joint ventures (Details) - BRL (R$) R$ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Investments |  |  |  |  |  |
Equity | R$ 14,587,492 | R$ 2,611,435 | R$ 14,587,492 | R$ 2,611,435 | R$ 7,337,378 | R$ 18,087,969
Income (loss) for the period | 10,036,699 | (2,052,518) | 7,281,440 | (15,471,579) |  |
Company participation in Carrying amount | 236,618 |  | 236,618 |  | R$ 96,373 |
Company participation in the income of the period | 80,098 | R$ (3,663) | R$ 90,364 | (2,952) |  |
Ensyn Corporation |  |  |  |  |  |
Investments |  |  |  |  |  |
Participation equity in associate (as a percent) |  |  | 26.24% |  | 25.30% |
Woodspin Oy |  |  |  |  |  |
Investments |  |  |  |  |  |
Participation equity in associate (as a percent) |  |  | 50.00% |  |  |
Spinnova OY |  |  |  |  |  |
Investments |  |  |  |  |  |
Participation equity in associate (as a percent) |  |  | 19.91% |  | 23.44% |
Investments in associates and joint ventures |  |  |  |  |  |
Investments |  |  |  |  |  |
Company participation in Carrying amount | 236,618 |  | R$ 236,618 |  | R$ 96,373 |
Company participation in the income of the period |  |  | 89,618 | (2,952) |  |
Investments in associates and joint ventures | Associates |  |  |  |  |  |
Investments |  |  |  |  |  |
Company participation in Carrying amount | 132,410 |  | 132,410 |  | 20,859 |
Company participation in the income of the period |  |  | R$ (18,467) | (16,052) |  |
Investments in associates and joint ventures | Ensyn Corporation |  |  |  |  |  |
Investments |  |  |  |  |  |
Participation equity in associate (as a percent) |  |  | 26.24% |  |  |
Company participation in Carrying amount | 7,714 |  | R$ 7,714 |  | 5,472 |
Company participation in the income of the period |  |  | R$ (3,013) | (13,086) |  |
Investments in associates and joint ventures | Spinnova Plc |  |  |  |  |  |
Investments |  |  |  |  |  |
Participation equity in associate (as a percent) |  |  | 19.91% |  |  |
Company participation in Carrying amount | 124,696 |  | R$ 124,696 |  | 15,387 |
Company participation in the income of the period |  |  | (15,454) | (2,966) |  |
Investments in associates and joint ventures | Joint ventures |  |  |  |  |  |
Investments |  |  |  |  |  |
Company participation in Carrying amount | 104,208 |  | 104,208 |  | 75,514 |
Company participation in the income of the period |  |  | R$ 17,218 | 13,100 |  |
Investments in associates and joint ventures | Ibema Companhia Brasileira de Papel | Domestic (Brazil) |  |  |  |  |  |
Investments |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  | 49.90% |  |  |
Company participation in Carrying amount | 87,523 |  | R$ 87,523 |  | 70,305 |
Company participation in the income of the period |  |  | R$ 17,218 | 11,651 |  |
Investments in associates and joint ventures | F&E Technologies LLC | Foreign |  |  |  |  |  |
Investments |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  | 50.00% |  |  |
Company participation in Carrying amount | 5,014 |  | R$ 5,014 |  | R$ 5,209 |
Company participation in the income of the period |  |  |  | R$ 1,449 |  |
Investments in associates and joint ventures | Woodspin Oy | Foreign |  |  |  |  |  |
Investments |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  | 50.00% |  |  |
Company participation in Carrying amount | 11,671 |  | R$ 11,671 |  |  |
Investments in associates and joint ventures | Other movements |  |  |  |  |  |
Investments |  |  |  |  |  |
Company participation in the income of the period |  |  | 90,867 |  |  |
Investments in associates and joint ventures | Spinnova OY |  |  |  |  |  |
Investments |  |  |  |  |  |
Company participation in the income of the period |  |  | 90,867 |  |  |
Ensyn Corporation | Investments in associates and joint ventures |  |  |  |  |  |
Investments |  |  |  |  |  |
Equity | 29,398 |  | 29,398 |  |  |
Income (loss) for the period |  |  | (11,482) |  |  |
Spinnova Plc | Investments in associates and joint ventures |  |  |  |  |  |
Investments |  |  |  |  |  |
Equity | 626,299 |  | 626,299 |  |  |
Income (loss) for the period |  |  | (77,619) |  |  |
Ibema Companhia Brasileira de Papel | Investments in associates and joint ventures | Domestic (Brazil) |  |  |  |  |  |
Investments |  |  |  |  |  |
Equity | 175,396 |  | 175,396 |  |  |
Income (loss) for the period |  |  | 34,504 |  |  |
F&E Technologies LLC | Investments in associates and joint ventures | Foreign |  |  |  |  |  |
Investments |  |  |  |  |  |
Equity | R$ 10,029 |  | R$ 10,029 |  |  |

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