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Receivables From Customers - Schedule of Trade and Other Receivables (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Billed supply R$ 3,851 R$ 3,240
Unbilled supply 1,373 1,244
Other concession holders - wholesale supply 73 67
Other concession holders - wholesale supply, unbilled 369 369
CCEE (Power Trading Chamber) 114 162
Concession Holders - power transport 173 180
Concession Holders - power transport, unbilled 391 370
Provision for expected credit losses (867) (820)
Trade and other receivables 5,477 4,812
Current assets 5,434 4,769
Non-current assets 43 R$ 43
Balances Not Yet Due [member]    
IfrsStatementLineItems [Line Items]    
Billed supply 2,041  
Unbilled supply 1,373  
Other concession holders - wholesale supply 26  
Other concession holders - wholesale supply, unbilled 369  
CCEE (Power Trading Chamber) 84  
Concession Holders - power transport 53  
Concession Holders - power transport, unbilled 391  
Provision for expected credit losses (165)  
Trade and other receivables 4,172  
Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Billed supply 428  
Other concession holders - wholesale supply 47  
CCEE (Power Trading Chamber) 22  
Concession Holders - power transport 62  
Provision for expected credit losses (22)  
Trade and other receivables 537  
Later than three months and not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Billed supply 561  
CCEE (Power Trading Chamber) 6  
Concession Holders - power transport 10  
Provision for expected credit losses (80)  
Trade and other receivables 497  
More Than One Year [member]    
IfrsStatementLineItems [Line Items]    
Billed supply 821  
CCEE (Power Trading Chamber) 2  
Concession Holders - power transport 48  
Provision for expected credit losses (600)  
Trade and other receivables R$ 271