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Schedule of assumptions adopted for the calculation of contract assets (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Concession Assets [Member]    
IfrsStatementLineItems [Line Items]    
Construction income 1.65%  
Operating And Maintenance Margin [Member]    
IfrsStatementLineItems [Line Items]    
Operating and maintenance margin 1.65% 1.65%
Remuneration Rate [Member]    
IfrsStatementLineItems [Line Items]    
Remuneration rate 9.56% 9.58%
Contract correction index  IPCA (b)   IPCA (b) 
R B S E Assets [Member]    
IfrsStatementLineItems [Line Items]    
Remuneration rate 9.54% 9.54%
Contract correction index    IPCA 
Annual RAP, according to Homologatory Resolution   R$ 279,406
R B S E Assets One [Member]    
IfrsStatementLineItems [Line Items]    
Contract correction index  IPCA   
Annual Rap [Member]    
IfrsStatementLineItems [Line Items]    
Annual RAP, according to Homologatory Resolution R$ 456,499 R$ 415,455
R B S E Assets Two [Member]    
IfrsStatementLineItems [Line Items]    
Annual RAP, according to Homologatory Resolution R$ 192,288