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18. INVESTMENTS (Details 5)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Amazonia [Member]    
Disclosure of detailed information about investment property [line items]    
Direct stake 74.50% 74.50%
Indirect stake 5.76% 12.46%
Renova [Member]    
Disclosure of detailed information about investment property [line items]    
Direct stake 36.23% [1] 36.23% [2]
Indirect stake [1] 8.39% [2]
Lightger [Member]    
Disclosure of detailed information about investment property [line items]    
Direct stake 49.00% 49.00%
Indirect stake 11.52% 24.92%
Guanhaes [Member]    
Disclosure of detailed information about investment property [line items]    
Direct stake 49.00% 49.00%
Indirect stake 11.52% 24.92%
Axxion [Member]    
Disclosure of detailed information about investment property [line items]    
Direct stake 49.00% 49.00%
Indirect stake 11.52% 24.92%
UHE Itaocara [Member]    
Disclosure of detailed information about investment property [line items]    
Direct stake 49.00% 49.00%
Indirect stake 11.52% 24.92%
Light [Member]    
Disclosure of detailed information about investment property [line items]    
Direct stake 22.58% 26.06%
Indirect stake 22.80%
[1] On October 15, 2019, Light sold the totality of its shares in the jointly-controlled entity Renova to CG I Fundo de Investimento em Participacoes. Further details as follows.
[2] Bank Financial Notes (Letras Financeiras, or LFs) are fixed- rate fixed-income securities, issued by banks and that accrued interest a percentage of the CDI rate published by Cetip. The LFs had remuneration rates varying between 101.95% and 113% of the CDI rate in 2019 (102% and 111.25% in 2018 and 102.01% to 112% in 2017).