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Receivables from Customers, Traders and Concession Holders - Schedule of Trade and Other Receivables (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Other concession holders - wholesale supply R$ 100 R$ 73
Other concession holders - wholesale supply, unbilled 400 369
CCEE (Power Trading Chamber) 118 114
Concession Holders - power transport 213 173
Concession Holders - power transport, unbilled 428 391
Expected credit losses (851) (867)
Trade and other receivables 5,851 5,477
Current assets 5,619 5,434
Non-current assets 232 43
Energy [Member]    
IfrsStatementLineItems [Line Items]    
Billed supply 3,734 3,527
Unbilled supply 1,288 1,351
Compressed Natural Gas / Liquefied Natural Gas [Member]    
IfrsStatementLineItems [Line Items]    
Billed supply 395 324
Unbilled supply 25 R$ 22
Balances Not Yet Due [member]    
IfrsStatementLineItems [Line Items]    
Other concession holders - wholesale supply 44  
Other concession holders - wholesale supply, unbilled 400  
CCEE (Power Trading Chamber) 59  
Concession Holders - power transport 100  
Concession Holders - power transport, unbilled 428  
Expected credit losses (152)  
Trade and other receivables 4,286  
Balances Not Yet Due [member] | Energy [Member]    
IfrsStatementLineItems [Line Items]    
Billed supply 1,921  
Unbilled supply 1,288  
Balances Not Yet Due [member] | Compressed Natural Gas / Liquefied Natural Gas [Member]    
IfrsStatementLineItems [Line Items]    
Billed supply 173  
Unbilled supply 25  
Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Other concession holders - wholesale supply 56  
Other concession holders - wholesale supply, unbilled  
CCEE (Power Trading Chamber) 57  
Concession Holders - power transport 48  
Concession Holders - power transport, unbilled  
Expected credit losses (45)  
Trade and other receivables 592  
Not later than three months [member] | Energy [Member]    
IfrsStatementLineItems [Line Items]    
Billed supply 452  
Unbilled supply  
Not later than three months [member] | Compressed Natural Gas / Liquefied Natural Gas [Member]    
IfrsStatementLineItems [Line Items]    
Billed supply 24  
Unbilled supply  
Later than three months and not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Other concession holders - wholesale supply  
Other concession holders - wholesale supply, unbilled  
CCEE (Power Trading Chamber)  
Concession Holders - power transport 7  
Concession Holders - power transport, unbilled  
Expected credit losses (121)  
Trade and other receivables 569  
Later than three months and not later than one year [member] | Energy [Member]    
IfrsStatementLineItems [Line Items]    
Billed supply 475  
Unbilled supply  
Later than three months and not later than one year [member] | Compressed Natural Gas / Liquefied Natural Gas [Member]    
IfrsStatementLineItems [Line Items]    
Billed supply 198  
Unbilled supply  
More Than One Year [member]    
IfrsStatementLineItems [Line Items]    
Other concession holders - wholesale supply  
Other concession holders - wholesale supply, unbilled  
CCEE (Power Trading Chamber) 2  
Concession Holders - power transport 48  
Concession Holders - power transport, unbilled  
Expected credit losses (533)  
Trade and other receivables 403  
More Than One Year [member] | Energy [Member]    
IfrsStatementLineItems [Line Items]    
Billed supply 886  
Unbilled supply  
More Than One Year [member] | Compressed Natural Gas / Liquefied Natural Gas [Member]    
IfrsStatementLineItems [Line Items]    
Billed supply  
Unbilled supply