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PROVISIONS FOR LITIGATION AND CONTINGENT LIABILITIES - Probable losses paragraphs (Details)
R$ in Thousands
12 Months Ended
Dec. 31, 2023
BRL (R$)
item
Dec. 31, 2022
BRL (R$)
item
Provisions recognized    
Loan agreements R$ 896,746  
Judicial deposits R$ 26,541,692 R$ 33,332,719
Compulsory Loan, Interest Rate 6.00%  
Estimate loss or value involved in the legal proceeding R$ 47,023,866 43,952,814
Provision on legal proceedings, non-current 24,250,819 30,623,558
Insufficient collection or declaration for PIS/COFINS    
Provisions recognized    
Estimate loss or value involved in the legal proceeding 1,730,503 1,645,510
Notice of Violation - PIS/COFINS    
Provisions recognized    
Estimate loss or value involved in the legal proceeding 202,475 189,208
Chesf    
Provisions recognized    
Estimate loss or value involved in the legal proceeding 673,210 611,987
Civil    
Provisions recognized    
Judicial deposits 22,833,389 29,647,200
Provision on legal proceedings, non-current 20,550,810 26,945,065
Compulsory Loan    
Provisions recognized    
Provisions (net of reversal) 1,937,088  
Reductions obtained 3,895,596  
Reductions obtained for agreements that have already been signed 1,954,876  
Reductions obtained as a result of payments made 2,923,987  
Judicial deposits R$ 17,263,567 R$ 24,424,205
Number of legal actions filed | item 3,374 3,703
Declaration of Nullity | Chesf    
Provisions recognized    
Litigation amount claimed R$ 350,000  
Provision on legal proceedings, non-current 2,118,528 R$ 2,067,368
Tax    
Provisions recognized    
Provision on legal proceedings, non-current 784,408 586,489
Labor    
Provisions recognized    
Judicial deposits 2,291,718 2,076,887
Provision on legal proceedings, non-current R$ 2,283,424 R$ 2,069,861