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Related Party Transactions (Details 3)
R$ in Millions
 12 Months Ended
Dec. 31, 2023
BRL (R$)
IfrsStatementLineItems [Line Items]  
Related party transaction amount R$ 3,340
Norte energia s.a. [member]  
IfrsStatementLineItems [Line Items]  
Related party Norte Energia (NESA) [1]
Relationship Affiliated [1]
Type Surety [1]
Objective Financing [1]
Related party transaction amount R$ 2,574 [1]
Maturity 2042 [1]
Norte Energia S.A one [member]  
IfrsStatementLineItems [Line Items]  
Related party Norte Energia S.A (NESA)/Light [2]
Relationship Affiliated [2]
Type Counter-guarantee [2]
Objective Financing [2]
Related party transaction amount R$ 684 [2]
Maturity 2042 [2]
Norte Energia S A Two [Member]  
IfrsStatementLineItems [Line Items]  
Related party Norte Energia (NESA)
Relationship Affiliated
Type Surety
Objective Debentures
Related party transaction amount R$ 82
Maturity 2030
[1] Related to Norte Energia loans.
[2] Counter-guarantee to Light, related to execution of guarantees of the Norte Energia loans.