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Assets and liabilities from subsidiaries held for sale and discontinued operations (Details 4 - Textuals 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Assets and liabilities from subsidiaries held for sale and discontinued operations      
Net income from discontinued operations R$ 65,264 R$ 280,633 R$ (492,257)
Total Discontinued operations      
Assets and liabilities from subsidiaries held for sale and discontinued operations      
Net income from discontinued operations 65,264 280,633 492,257
Total Discontinued operations | Oxiteno S. A. Industria e Comercio [member]      
Assets and liabilities from subsidiaries held for sale and discontinued operations      
Net income from discontinued operations R$ 249,303 R$ 0 R$ (23,896)