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17. CONCESSION CONTRACT ASSETS (Details Narrative) - BRL (R$)
R$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]        
Borrowing costs capitalised   R$ 21    
Impairment on assets   29 R$ 42  
Impairment loss R$ 26      
Remaining balance of indemnity for transmission   348 492  
Contract assets   2,005 1,729
Transmission - Assets Remunerated by Tariff [Member]        
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]        
Contract assets   R$ 849 R$ 637