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Intangible assets (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning R$ 10,277,727    
Reclassification (10,338)   R$ 111
Intangible assets, ending 11,170,089 R$ 10,277,727  
Other In Service [member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning 12,848 22,242  
Acquisitions 37  
Transfers from property, plant and equipment 4,570 (9,795)  
Capitalizations for intangible in service 14,555 5,561  
Amortization of quotas - concession and authorization (8,040) (5,160)  
Loss on disposal  
Business combination effects 4    
Reclassification (34)    
Intangible assets, ending 23,940 12,848 22,242
Other In Progress [member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning 28,330 27,131  
Acquisitions 13,351 8,319  
Transfers from property, plant and equipment  
Capitalizations for intangible in service (14,555) (5,561)  
Amortization of quotas - concession and authorization  
Loss on disposal (6) (1,559)  
Business combination effects    
Reclassification    
Intangible assets, ending 27,120 28,330 27,131
Other [member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning 41,178 49,373  
Acquisitions 13,388 8,319  
Transfers from property, plant and equipment 4,570 (9,795)  
Capitalizations for intangible in service  
Amortization of quotas - concession and authorization (8,040) (5,160)  
Loss on disposal (6) (1,559)  
Business combination effects 4    
Reclassification (34)    
Intangible assets, ending R$ 51,060 R$ 41,178 R$ 49,373