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PROVISIONS FOR LITIGATION AND CONTINGENT LIABILITIES - Possible losses paragraphs - Contingent liabilities (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2015
Contingent liabilities      
Estimate loss or value involved in the legal proceeding R$ 47,023,866 R$ 43,952,814  
Civil      
Contingent liabilities      
Estimate loss or value involved in the legal proceeding 29,537,849 27,507,399  
Labor      
Contingent liabilities      
Estimate loss or value involved in the legal proceeding 2,297,320 2,284,664  
Tax      
Contingent liabilities      
Estimate loss or value involved in the legal proceeding 11,176,242 10,400,731  
Environmental      
Contingent liabilities      
Estimate loss or value involved in the legal proceeding 2,510,300 1,811,883  
Regulatory      
Contingent liabilities      
Estimate loss or value involved in the legal proceeding 1,117,418 1,602,258  
Others      
Contingent liabilities      
Estimate loss or value involved in the legal proceeding 384,737 345,879  
Public Civil Action - Federal Public Prosecutor's Office of Bahia      
Contingent liabilities      
Estimate loss or value involved in the legal proceeding 4,135,073 3,772,158  
Nullity of the trade union agreement      
Contingent liabilities      
Estimate loss or value involved in the legal proceeding 4,549,567 4,159,029  
Amount sought 1,000,000    
Insufficient collection or declaration for PIS/COFINS      
Contingent liabilities      
Estimate loss or value involved in the legal proceeding 1,730,503 1,645,510  
Chesf's contingent liability for collection of alleged losses to final consumers      
Contingent liabilities      
Estimate loss or value involved in the legal proceeding R$ 2,455,511 R$ 2,252,254 R$ 1,471
Suspension request period 6 months    
Book-Entry Credits      
Contingent liabilities      
Estimate loss or value involved in the legal proceeding R$ 3,300,000    
Remunerative interest rate 6.00%