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Contract assets (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Concession Assets [Member]    
Statement [Line Items]    
Construction income 1.65% 1.65%
Operating and maintenance margin 1.65% 1.65%
Remuneration rate 9.62% 9.60%
Contract correction index IPCA (b) IPCA (b)
Annual RAP, according to Homologatory Resolution R$ 611,620 R$ 574,028
R B S E Assets Financial [Member]    
Statement [Line Items]    
Remuneration rate 8.11% 8.11%
Contract correction index IPCA IPCA
Annual RAP, according to Homologatory Resolution R$ 209,055 R$ 201,158
R B S E Assets Economic [Member]    
Statement [Line Items]    
Remuneration rate 11.10% 11.10%
Contract correction index IPCA IPCA
Annual RAP, according to Homologatory Resolution R$ 115,920 R$ 157,525