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Related Party Transactions (Details 2)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
BRL (R$)
IfrsStatementLineItems [Line Items]  
Related party transaction amount R$ 3,289
Norte energia s.a. [member]  
IfrsStatementLineItems [Line Items]  
Related party Norte Energia (NESA)
Type Surety [1]
Objective Financing
Related party transaction amount R$ 2,524
Maturity 2042
Norte Energia S.A one [member]  
IfrsStatementLineItems [Line Items]  
Related party Norte Energia (NESA)
Type Counter-guarantee [2]
Objective Financing
Related party transaction amount R$ 684
Maturity 2042
Norte Energia S A Two [Member]  
IfrsStatementLineItems [Line Items]  
Related party Norte Energia S.A (NESA)/Light
Type Surety
Objective Debentures
Related party transaction amount R$ 81
Maturity 2030
[1]

Related to Norte Energia loans.
[2] Counter-guarantee to Light, related to execution of guarantees of the Norte Energia loans.