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Intangible assets (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning R$ 9,215,560    
Loss on disposal (55,177) R$ (30,623) R$ (52,811)
Intangible assets, ending 10,277,727 9,215,560  
Distribution Concession Agreement In Service [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning 9,330,317 8,953,486  
Transfers from accounts receivable - concessions    
Transfers from contract assets 1,332,118 943,905  
Transfers to other receivables (955) (3,563)  
Amortization of quotas - concession and authorization [1] (564,252) (522,525)  
Amortization of quotas - PIS/Pasep and Cofins credits (10,483) (10,363)  
Loss on disposal (53,494) (30,623)  
Intangible assets, ending 10,033,251 9,330,317 8,953,486
Distribution Concession Agreement Special Liabilities In Service [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning (2,734,133) (2,750,099)  
Transfers from accounts receivable - concessions   (8,385)  
Transfers from contract assets (194,794) (122,346)  
Transfers to other receivables  
Amortization of quotas - concession and authorization [1] 153,503 146,697  
Amortization of quotas - PIS/Pasep and Cofins credits  
Loss on disposal  
Intangible assets, ending (2,775,424) (2,734,133) R$ (2,750,099)
Distribution Concession Agreement [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning 6,596,184 6,203,387  
Transfers from accounts receivable - concessions   (8,385)  
Transfers from contract assets 1,137,324 821,559  
Transfers to other receivables (955) (3,563)  
Amortization of quotas - concession and authorization [1] (410,749) (375,828)  
Amortization of quotas - PIS/Pasep and Cofins credits (10,483) (10,363)  
Loss on disposal (53,494) R$ (30,623)  
Intangible assets, ending R$ 7,257,827    
[1] Amortization during the concession period after the transfer to intangible assets in service of useful life of the assets, whichever the lower.