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Investments in joint controlled entities and associates (Details - Textuals) - BRL (R$)
R$ in Thousands
 12 Months Ended
Feb. 01, 2022
Oct. 01, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of joint ventures [line items]          
Sale value of joint venture after adjustments resulting from changes in working capital and net debt position     R$ (220,190) R$ (158,733) R$ (487,390)
Gain (loss) on disposal of Conectcar         R$ 85,455
Quimica da Bahia Industria e Comercio S.A. [member]          
Disclosure of joint ventures [line items]          
Proportion of ownership interest in joint venture 50.00%   50.00% [1]    
Connect car [member]          
Disclosure of joint ventures [line items]          
Proportion of ownership interest in joint venture     0.00% [2] 50.00% [3] 50.00%
Connect car [member] | IPP [member]          
Disclosure of joint ventures [line items]          
Proportion of ownership interest in joint venture   50.00%      
Sale value of joint venture   R$ 165,000      
Sale value of joint venture after adjustments resulting from changes in working capital and net debt position   R$ 158,000      
[1] The Company acquired a 50% interest in Química da Bahia on February 1, 2022. Until January 31, 2022, Química da Bahia was an associate of Oxiteno S.A.
[2] The subsidiary IPP held an interest in ConectCar, which is primarily engaged in automatic payment of tolls and parking. On June 25, 2021, the sale of ConectCar to Porto Seguro S.A., through its subsidiary Portoseg S.A. – Crédito, Financiamento e Investimento, was announced. The transactions were completed on October 1, 2021. The sale value of the 50% interest in the subsidiary IPP was R$ 165 million, and, after adjustments resulting from changes in working capital and net debt position, totaled R$ 158 million.
[3] The balances presented refer to September 30, 2021, due to the completion of the sale of ConectCar on October 1, 2021.