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Intangible assets (Details) - BRL (R$)
R$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Cost R$ 66,384,034 R$ 65,239,037
Accumulated amortization (21,924,912) (21,226,179)
Net 44,459,122 44,012,858
Agreements Equity Values [Member]    
IfrsStatementLineItems [Line Items]    
Cost 754,555 747,925
Accumulated amortization (247,159) (241,808)
Net 507,396 506,117
Agreements Economic Value [Member]    
IfrsStatementLineItems [Line Items]    
Cost 1,687,440 1,686,384
Accumulated amortization (1,085,649) (1,048,624)
Net 601,791 637,760
Agreements Concessio New Contracts [Member]    
IfrsStatementLineItems [Line Items]    
Cost 148,000 148,000
Accumulated amortization (1,644) (411)
Net 146,356 147,589
Program Contracts [Member]    
IfrsStatementLineItems [Line Items]    
Cost 30,924,633 30,267,977
Accumulated amortization (9,874,351) (9,583,480)
Net 21,050,282 20,684,497
Program Contract Commitments [Member]    
IfrsStatementLineItems [Line Items]    
Cost 1,709,757 1,709,757
Accumulated amortization (510,973) (497,731)
Net 1,198,784 1,212,026
Service Contracts Sao Paulo[Member]    
IfrsStatementLineItems [Line Items]    
Cost 29,557,680 29,161,286
Accumulated amortization (9,318,616) (8,967,701)
Net 20,239,064 20,193,585
Software Licenses [Member]    
IfrsStatementLineItems [Line Items]    
Cost 1,310,942 1,300,504
Accumulated amortization (822,184) (787,280)
Net 488,758 513,224
Right Of Uses [Member]    
IfrsStatementLineItems [Line Items]    
Cost 291,027 217,204
Accumulated amortization (64,336) (99,144)
Net R$ 226,691 R$ 118,060