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Investments - Investments in Associates and Joint Ventures (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2025 BRL (R$) | Jun. 30, 2024 BRL (R$) | Jun. 30, 2025 BRL (R$) | Jun. 30, 2025 BRL (R$) € / shares | Jun. 30, 2024 BRL (R$) | Jun. 30, 2024 BRL (R$) € / shares | Dec. 31, 2024 BRL (R$) | Dec. 31, 2023 BRL (R$)
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Equity | R$ 43,271,305,000 | R$ 40,614,195,000 | R$ 43,271,305,000 | R$ 43,271,305,000 | R$ 40,614,195,000 | R$ 40,614,195,000 | R$ 32,415,575,000 | R$ 44,810,300,000
Income (expenses) of the period | 5,011,953,000 | (3,765,517,000) | R$ 11,360,131,000 |  | (3,545,485,000) |  |  |
% |  |  | 100.00% |  |  |  | 100.00% |
In the income (expenses) for the period |  |  | R$ (189,082,000) |  | (3,514,000) |  |  |
Impairment loss (reversal of impairment loss) recognised in profit or loss |  |  | 76,066,000 |  |  |  |  |
Goodwill | 180,981,000 |  | 180,981,000 | 180,981,000 |  |  | R$ 225,486,000 |
Total Investments, including Goodwill and Financial Instruments | 1,404,970,000 |  | 1,404,970,000 | 1,404,970,000 |  |  | 1,816,923,000 |
Reclassification adjustments on exchange differences on translation of foreign operations, net of tax | (15,636,000) | R$ 4,000 | (15,636,000) |  |  |  |  |
Associate | Foreign |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Investments Accounted for Using Equity Method, Excluding Goodwill | 92,617,000 |  | 92,617,000 | 92,617,000 |  |  | 125,316,000 |
In the income (expenses) for the period |  |  | R$ (14,256,000) |  | (9,235,000) |  |  |
Ensyn Corporation | Foreign |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Participation equity (%) |  |  | 24.80% |  |  |  |  |
Investments Accounted for Using Equity Method, Excluding Goodwill | (1,261,000) |  | R$ (1,261,000) | (1,261,000) |  |  | 2,000 |
In the income (expenses) for the period |  |  | (4,539,000) |  | (170,000) |  |  |
Spinnova Plc |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Impairment loss (reversal of impairment loss) recognised in profit or loss |  |  | (63,634,000) |  |  |  |  |
Goodwill | 180,981,000 |  | R$ 180,981,000 | 180,981,000 |  |  | 225,486,000 |
Spinnova Plc | Foreign |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Participation equity (%) |  |  | 18.76% |  |  |  |  |
Investments Accounted for Using Equity Method, Excluding Goodwill | 85,754,000 |  | R$ 85,754,000 | 85,754,000 |  |  | 95,254,000 |
In the income (expenses) for the period |  |  | (9,155,000) |  | (9,065,000) |  |  |
Joint ventures |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Investments Accounted for Using Equity Method, Excluding Goodwill | 199,650,000 |  | 199,650,000 | 199,650,000 |  |  | 328,055,000 |
In the income (expenses) for the period |  |  | R$ (111,192,000) |  | 5,721,000 |  |  |
Biomas | Domestic (Brazil) |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Participation equity (%) |  |  | 16.66% |  |  |  |  |
Investments Accounted for Using Equity Method, Excluding Goodwill | (184,000) |  | R$ (184,000) | (184,000) |  |  | 2,923,000 |
In the income (expenses) for the period |  |  | R$ (3,107,000) |  | (2,001,000) |  |  |
Ibema Companhia Brasileira de Papel | Domestic (Brazil) |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Participation equity (%) |  |  | 49.90% |  |  |  |  |
Investments Accounted for Using Equity Method, Excluding Goodwill | 194,213,000 |  | R$ 194,213,000 | 194,213,000 |  |  | 193,901,000 |
In the income (expenses) for the period |  |  | R$ 9,147,000 |  | 19,040,000 |  |  |
F&E Technologies LLC | Foreign |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Participation equity (%) |  |  | 50.00% |  |  |  |  |
Investments Accounted for Using Equity Method, Excluding Goodwill | 5,621,000 |  | R$ 5,621,000 | 5,621,000 |  |  | 6,378,000 |
In the income (expenses) for the period |  |  |  |  |  |  |  |
Woodspin Oy |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Share Of Profit Loss Of Investments Accounted For Using Equity Method |  |  | R$ (117,848,000) |  |  |  |  |
Woodspin Oy | Foreign |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Participation equity (%) |  |  | 50.00% |  |  |  |  |
Investments Accounted for Using Equity Method, Excluding Goodwill |  |  |  |  |  |  | 124,853,000 |
In the income (expenses) for the period |  |  | (117,232,000) |  | (11,318,000) |  |  |
Total other investments evaluated at fair value |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
In the income (expenses) for the period |  |  |  |  |  |  |  |
Non-current financial assets at fair value through other comprehensive income | 931,722,000 |  | R$ 931,722,000 | 931,722,000 |  |  | 1,138,066,000 |
Bem Agro Integração e Desenvolvimento S.A. (Indirect) |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
% |  |  | 5.82% |  |  |  |  |
Bem Agro Integração e Desenvolvimento S.A. (Indirect) | Domestic (Brazil) |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Non-current financial assets at fair value through other comprehensive income | 3,551,000 |  | R$ 3,551,000 | 3,551,000 |  |  | 4,026,000 |
Celluforce Inc. (Direct) |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
% |  |  | 8.28% |  |  |  |  |
Celluforce Inc. (Direct) | Foreign |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Non-current financial assets at fair value through other comprehensive income | 25,897,000 |  | R$ 25,897,000 | 25,897,000 |  |  | 27,823,000 |
Nfinite Nanotechnology Inc. (Indirect) |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
% |  |  | 4.90% |  |  |  |  |
Nfinite Nanotechnology Inc. (Indirect) | Foreign |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Non-current financial assets at fair value through other comprehensive income | 5,594,000 |  | R$ 5,594,000 | 5,594,000 |  |  | 6,347,000 |
Lenzing Aktiengesellschft [Member] |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
% |  |  | 15.00% |  |  |  |  |
Lenzing Aktiengesellschft [Member] | Foreign |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Non-current financial assets at fair value through other comprehensive income | 896,680,000 |  | R$ 896,680,000 | 896,680,000 |  |  | 1,099,870,000 |
Simplifyber, Inc (Indirect) | Foreign |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Participation equity (%) |  |  | 13.91% |  |  |  |  |
Investments Accounted for Using Equity Method, Excluding Goodwill | 8,124,000 |  | R$ 8,124,000 | 8,124,000 |  |  | 30,060,000 |
In the income (expenses) for the period |  |  | (562,000) |  |  |  |  |
Total Goodwill |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Impairment loss (reversal of impairment loss) recognised in profit or loss |  |  | (63,634,000) |  |  |  |  |
Goodwill | 180,981,000 |  | 180,981,000 | 180,981,000 |  |  | R$ 225,486,000 |
Ensyn Corporation |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Equity | (5,086,000) |  | (5,086,000) | (5,086,000) |  |  |  |
Income (expenses) of the period |  |  | (12,882,000) |  |  |  |  |
Spinnova Plc |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Equity | 457,112,000 |  | 457,112,000 | R$ 457,112,000 |  |  |  |
Income (expenses) of the period |  |  | (49,051,000) |  |  |  |  |
NASDAQ, Nordic Growth Market, Average Share Price | € / shares |  |  |  | R$ 0.48 |  | R$ 0.95 |  |
Biomas | Domestic (Brazil) |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Equity | (1,106,000) |  | (1,106,000) | R$ (1,106,000) |  |  |  |
Income (expenses) of the period |  |  | (20,302,000) |  |  |  |  |
Ibema Companhia Brasileira de Papel | Domestic (Brazil) |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Equity | 389,205,000 |  | 389,205,000 | 389,205,000 |  |  |  |
Income (expenses) of the period |  |  | 18,330,000 |  |  |  |  |
F&E Technologies LLC | Foreign |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Equity | 11,242,000 |  | 11,242,000 | 11,242,000 |  |  |  |
Income (expenses) of the period |  |  |  |  |  |  |  |
Woodspin Oy | Foreign |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Equity | 235,697,000 |  | 235,697,000 | 235,697,000 |  |  |  |
Income (expenses) of the period |  |  | (22,635,000) |  |  |  |  |
Simplifyber, Inc (Indirect) |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |
Equity | R$ 58,406,000 |  | 58,406,000 | R$ 58,406,000 |  |  |  |
Income (expenses) of the period |  |  | R$ (4,041,000) |  |  |  |  |

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