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Contract assets (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value measurement of assets [line items]      
Contract assets, beginning R$ 7,605,061    
Loss on disposal (14,496) R$ (16,728) R$ (8,829)
Contract assets, ending 7,210,906 7,605,061  
Total      
Disclosure of fair value measurement of assets [line items]      
Contract assets, beginning 2,201,958 2,332,171  
Acquisitions through business combinations, intangible assets and goodwill 2,465,040 2,305,311  
Transfers to intangible assets (2,103,522) (1,615,878)  
Customers Contributions Contract Assets (268,692) (339,277)  
Transfers to accounts receivable related to concession (578,820) (451,250)  
Loss on disposal (14,496) (16,728)  
Other transfers (20) (12,391)  
Contract assets, ending 1,701,448 2,201,958 2,332,171
Total | Assets Contract Assets [Member]      
Disclosure of fair value measurement of assets [line items]      
Contract assets, beginning 2,284,966 2,405,124  
Acquisitions through business combinations, intangible assets and goodwill 2,465,040 2,305,311  
Transfers to intangible assets (2,303,950) (1,888,949)  
Customers Contributions Contract Assets 0 0  
Transfers to accounts receivable related to concession (630,818) (507,401)  
Loss on disposal (14,496) (16,728)  
Other transfers (20) (12,391)  
Contract assets, ending 1,800,722 2,284,966 2,405,124
Total | Special Liabilities [Member]      
Disclosure of fair value measurement of assets [line items]      
Contract liability, beginning (83,008) (72,953)  
Acquisitions through business combinations, intangible assets and goodwill 0 0  
Transfers to intangible assets 200,428 273,071  
Customers Contributions Contract Assets (268,692) (339,277)  
Transfers to accounts receivable related to concession 51,998 56,151  
Loss on disposal 0 0  
Other transfers 0 0  
Contract liability, ending R$ (99,274) R$ (83,008) R$ (72,953)