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4. CONCESSIONS AND AUTHORIZATIONS (Details 1)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Queimadao Consortium Enterprise [member]  
Disclosure Of Concession And Amount To Be Paid [line items]  
Nominal value in 2019 R$ 9
Present value in 2019 R$ 5
Period of the concession 01/2004 – 12/2032
Updating indexer IGPM
Irape Enterprise [member]  
Disclosure Of Concession And Amount To Be Paid [line items]  
Nominal value in 2019 R$ 38
Present value in 2019 R$ 18
Period of the concession 03/2006 – 02/2035
Updating indexer IGPM