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8. RECEIVABLES FROM CUSTOMERS, TRADERS AND POWER TRANSPORT CONCESSION HOLDERS (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of trade and other receivables [line items]    
Billed supply R$ 3,125 R$ 3,130
Unbilled supply 1,145 1,204
Other concession holders - wholesale supply 50 47
Other concession holders - wholesale supply, unbilled 260 204
CCEE (Power Trading Chamber) 210 386
Concession Holders - power transport 161 187
Concession Holders - power transport, unbilled 295 253
Provision for doubtful receivables (712) (810)
Trade and other receivables 4,534 4,601
Current assets 4,373 4,524 [1]
Non-current assets 161 R$ 77 [1]
Balances Not Yet Due [member]    
Disclosure of trade and other receivables [line items]    
Billed supply 1,518  
Unbilled supply 1,145  
Other concession holders - wholesale supply 18  
Other concession holders - wholesale supply, unbilled 260  
CCEE (Power Trading Chamber) 21  
Concession Holders - power transport 45  
Concession Holders - power transport, unbilled 295  
Provision for doubtful receivables (278)  
Trade and other receivables 3,024  
Not Later Than Three Months [member]    
Disclosure of trade and other receivables [line items]    
Billed supply 637  
Unbilled supply  
Other concession holders - wholesale supply 26  
Other concession holders - wholesale supply, unbilled  
CCEE (Power Trading Chamber) 189  
Concession Holders - power transport 14  
Concession Holders - power transport, unbilled  
Provision for doubtful receivables (12)  
Trade and other receivables 854  
3 months to 1 year [member]    
Disclosure of trade and other receivables [line items]    
Billed supply 387  
Unbilled supply  
Other concession holders - wholesale supply 1  
Other concession holders - wholesale supply, unbilled  
CCEE (Power Trading Chamber)  
Concession Holders - power transport 17  
Concession Holders - power transport, unbilled  
Provision for doubtful receivables (15)  
Trade and other receivables 390  
More Than One Year [member]    
Disclosure of trade and other receivables [line items]    
Billed supply 583  
Unbilled supply  
Other concession holders - wholesale supply 5  
Other concession holders - wholesale supply, unbilled  
CCEE (Power Trading Chamber)  
Concession Holders - power transport 85  
Concession Holders - power transport, unbilled  
Provision for doubtful receivables (407)  
Trade and other receivables R$ 266  
[1] See note 2.8.