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17. CONCESSION CONTRACT ASSETS (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Contract assets R$ 2,005 R$ 1,729
Current 172 131  
Non current 1,833 1,598  
Distribution - Infrastructure Assets Under Construction [Member]      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Contract assets 740 518  
Gas - Infrastructure Assets Under Construction [Member]      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Contract assets 68 82  
Transmission - Assets Reincorporated Into The Assets Remuneration Base [Member]      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Contract assets 348 492  
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