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Taxes Payable and Amounts to be Refunded to Customers - Schedule of Taxes and Amounts to be Restituted to Customers (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]        
Current taxes payable R$ 725 R$ 644    
Non current Taxes payable 496 362    
Total tax payable 1,221 1,006    
Pasep and Cofins taxes to be reimbursed to customers 692 1,518 R$ 3,304 R$ 3,023
ICMS [member]        
IfrsStatementLineItems [Line Items]        
Current taxes payable 146 113    
COFINS [member]        
IfrsStatementLineItems [Line Items]        
Current taxes payable 278 [1] 225    
Non current Taxes payable 407 297    
PIS/PASEP [member]        
IfrsStatementLineItems [Line Items]        
Current taxes payable 61 49    
Non current Taxes payable 89 65    
INSS [member]        
IfrsStatementLineItems [Line Items]        
Current taxes payable 59 54    
Other Tax Authority [member]        
IfrsStatementLineItems [Line Items]        
Current taxes payable 181 [2] 203    
PIS/PASEP and COFINS [member]        
IfrsStatementLineItems [Line Items]        
Current taxes payable 185 513    
Non current Taxes payable 166 664    
ICMS [Member]        
IfrsStatementLineItems [Line Items]        
Current taxes payable R$ 341 R$ 341    
[1]

PIS/Pasep and Cofins recorded in current liabilities include the deferral on the financial remuneration of the contract asset and on the construction and improvement revenues linked to the transmission contracts. For more information, see Note 15.
[2] This includes the retention, at source, of income tax on the Interest on Equity declared. This tax was paid in the subsequent month, in accordance with the tax legislation. More details in note 25.