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Intangible assets (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Cost R$ 68,551,450 R$ 65,239,037
Accumulated amortization (23,780,326) (21,226,179)
Net 44,771,124 44,012,858
Agreements Equity Values [Member]    
IfrsStatementLineItems [Line Items]    
Cost 747,925
Accumulated amortization (241,808)
Net 506,117
Concession agreements – economic value [Member]    
IfrsStatementLineItems [Line Items]    
Cost 1,686,384
Accumulated amortization (1,048,624)
Net 637,760
Agreements Concession New Contracts [Member]    
IfrsStatementLineItems [Line Items]    
Cost 148,000 148,000
Accumulated amortization (5,344) (411)
Net 142,656 147,589
Agreements Concession Others [Member]    
IfrsStatementLineItems [Line Items]    
Cost 112,456
Accumulated amortization (52,964)
Net 59,492
Program Contractses [Member]    
IfrsStatementLineItems [Line Items]    
Cost 30,267,977
Accumulated amortization (9,583,480)
Net 20,684,497
Program Contract Commitments [Member]    
IfrsStatementLineItems [Line Items]    
Cost 4,437,857 1,709,757
Accumulated amortization (588,098) (497,731)
Net 3,849,759 1,212,026
Services contracts – Sao Paulo [Member]    
IfrsStatementLineItems [Line Items]    
Cost 29,161,286
Accumulated amortization (8,967,701)
Net 20,193,585
Concession agreement – URAE-1 [Member]    
IfrsStatementLineItems [Line Items]    
Cost 62,042,186
Accumulated amortization (22,085,992)
Net 39,956,194
Software Licenses [Member]    
IfrsStatementLineItems [Line Items]    
Cost 1,570,845 1,300,504
Accumulated amortization (932,558) (787,280)
Net 638,287 513,224
Right Of Uses [Member]    
IfrsStatementLineItems [Line Items]    
Cost 240,106 217,204
Accumulated amortization (115,370) (99,144)
Net R$ 124,736 R$ 118,060