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Intangible assets (Details Narrative)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
BRL (R$)
Municipalities
Dec. 31, 2021
BRL (R$)
Municipalities
Dec. 31, 2020
BRL (R$)
Dec. 31, 2019
BRL (R$)
Municipalities
IfrsStatementLineItems [Line Items]        
Program contracts commitments, current R$ 100,188 R$ 77,652    
Program contracts commitments, noncurrent R$ 12,197 R$ 44,995    
Percentage of revenue 45.14% 44.45%    
Monthly remuneration plus any interests and charges R$ 14,299      
Monthly remuneration plus any interests and charges R$ 40,024      
Intangible assets, discount rate for adjustment - PPP 8.20%      
Amortization average rate 5.20% 4.90% 4.70%  
Contract asset R$ 8,613,968 [1] R$ 8,550,102 R$ 7,969,164 R$ 7,617,714
Intangible assets 39,320,871 36,503,834   R$ 32,325,447
Performance Agreements [Member]        
IfrsStatementLineItems [Line Items]        
Contract asset 138,550 737,657    
Intangible assets R$ 2,126,106 R$ 871,488    
Sao Paulo [Member]        
IfrsStatementLineItems [Line Items]        
Number of municipalities | Municipalities 375 375   372
Percentage of revenue 7.50%      
Sao Lourenco [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets, discount rate for adjustment - PPP 7.80%      
[1] The largest works are located in the municipalities of São Paulo, Franca and São Bernardo do Campo, in the amounts of R$ 2,830 million, R$ 324 million and R$ 262 million, respectively.