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Intangible assets (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Other In Service [Member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets, beginning R$ 23,940 R$ 12,848
Business combination effects   4
Acquisitions 0 37
Increase (decrease) through transfers, intangible assets other than goodwill 0 4,570
Transfers from contract assets 0  
Capitalizations for intangible in service 10,929 14,555
Amortization of quotas - concession and authorization (8,720) (8,040)
Loss on disposal 0 0
Reclassification (277) (34)
Intangible assets, ending 25,872 23,940
Other In Progress [Member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets, beginning 27,120 28,330
Business combination effects   0
Acquisitions 24,371 13,351
Increase (decrease) through transfers, intangible assets other than goodwill (3,339) 0
Transfers from contract assets 52  
Capitalizations for intangible in service (10,929) (14,555)
Amortization of quotas - concession and authorization 0 0
Loss on disposal (539) (6)
Reclassification (2,437) 0
Intangible assets, ending 34,299 27,120
Other [Member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets, beginning 51,060 41,178
Business combination effects   4
Acquisitions 24,371 13,388
Increase (decrease) through transfers, intangible assets other than goodwill (3,339) 4,570
Transfers from contract assets 52  
Capitalizations for intangible in service 0 0
Amortization of quotas - concession and authorization (8,720) (8,040)
Loss on disposal (539) (6)
Reclassification (2,714) (34)
Intangible assets, ending R$ 60,171 R$ 51,060