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Concession Contract Assets - Schedule of Concession Contracts (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Current consideration R$ 1,140 R$ 850
Non current consideration 5,351 3,907
Total consideration 6,491 4,757
National Grid ('BNES' - Basic Network of the Existing System) [member]    
IfrsStatementLineItems [Line Items]    
Current consideration 479 466
Non current consideration 1,137 1,257
National Grid - new facilities (RBNI) [member]    
IfrsStatementLineItems [Line Items]    
Current consideration 595 302
Non current consideration 3,892 2,358
Concession contract - 079/00 [member]    
IfrsStatementLineItems [Line Items]    
Current consideration 39 45
Non current consideration 110 118
Concession contract - 006/11 (c) [member]    
IfrsStatementLineItems [Line Items]    
Current consideration 18 28
Non current consideration 107 74
Concession contract - 004/05 [member]    
IfrsStatementLineItems [Line Items]    
Current consideration 9 9
Non current consideration R$ 105 R$ 100