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Intangible assets (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning R$ 10,277,727  
Intangible assets, ending 11,170,089 R$ 10,277,727
Gas distribution [member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning 726,107 96,145
Additions - renewal of the concession   413,410
Transfers from contract assets 11,503 13,738
Transfers from accounts receivable - concessions   243,628
Amortization of quotas - concession and authorization (27,832) (40,690)
Loss on disposal (152) (124)
Reclassification (709,626)  
Intangible assets, ending R$ 726,107