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Related parties - Balances recognized in assets and liabilities and amounts transacted during the period (Details) - BRL (R$) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | R$ 87,493,000 | R$ 50,321,000 |
Liabilities | (1,076,419,000) | (620,602,000) |
Sales (purchase) | 206,706,000 | 166,029,000 | R$ 213,563,000
Dividends and interest on own capital payable | 2,200,917,000 | 1,316,528,000 |
Controlling Shareholders |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Dividends and interest on own capital payable | 1,074,962,000 |  |
Non-Controlling Shareholders |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Dividends and interest on own capital payable | 1,125,955 |  |
Total Dividends |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Dividends and interest on own capital payable | 2,200,917 |  |
Trade accounts receivable |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 83,545,000 | 45,650,000 |
Other assets |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 3,948,000 | 4,671,000 |
Trade accounts payable |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Liabilities | (1,457,000) | (1,023,000) |
Dividends and interests on own capital payable |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Liabilities | (1,074,962,000) | (619,579,000) |
Transactions with majority shareholders |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 4,000 | 24,000 |
Liabilities | (1,074,983,000) | (619,579,000) |
Sales (purchase) | 66,000 | 9,000 | 91,000
Suzano Holding S.A. |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 4,000 | 24,000 |
Liabilities | (630,387,000) | (363,520,000) |
Sales (purchase) | 66,000 | 9,000 | 91,000
Controller |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Liabilities | (336,205,000) | (193,883,000) |
Managements and related persons |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets |  |  |
Liabilities | (55,627,000) | (31,748,000) |
Sales (purchase) |  |  |
Alden Fundo de Investimento em Ações |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Liabilities | (52,764,000) | (30,428,000) |
Transactions with companies of the Suzano Group and other related parties |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 87,489,000 | 50,297,000 |
Liabilities | (1,436,000) | (1,023,000) |
Sales (purchase) | 206,640,000 | 166,020,000 | 213,472,000
Management |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 61,000 | 61,000 |
Sales (purchase) | 538,000 | (906,000) | (47,000)
Bexma Participacoes Ltda. |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets |  |  |
Sales (purchase) | 7,000 | 9,000 | 38,000
Naman Capital Ltda |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Sales (purchase) |  | 7,000 | 10,000
Civelec Participações Ltda |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 3,860,000 | 4,575,000 |
Sales (purchase) |  | 4,825,000 |
Fundacao Arymax |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets |  |  |
Sales (purchase) | 5,000 | 3,000 | 4,000
Ibema Companhia Brasileira de Papel |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 83,343,000 | 45,659,000 |
Liabilities | (1,413,000) | (1,023,000) |
Sales (purchase) | 211,482,000 | 168,621,000 | 218,226,000
Instituto Ecofuturo - Futuro Para o Desenvolvimento Sustentavel |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 21,000 | 2,000 |
Liabilities |  |  |
Sales (purchase) | (5,173,000) | (5,549,000) | (4,603,000)
IPFL Holding S.A |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 1,000 |  |
Sales (purchase) | 10,000 | 5,000 | 38,000
Mabex Representacoes e Participacoes Ltda. |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Liabilities | (23,000) |  |
Sales (purchase) | (915,000) | (817,000) |
Nemonorte Imoveis e Participacoes Ltda. |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Sales (purchase) | R$ (177,000) | R$ (178,000) | R$ (194,000)

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