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27. REVENUE (Details 4) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of revenue [line items]      
Other revenue R$ 1,709 R$ 1,721 R$ 1,585
Subsidies [member]      
Disclosure of revenue [line items]      
Other revenue [1] 1,395 1,266 1,136
Services rendered [member]      
Disclosure of revenue [line items]      
Other revenue 139 183 188
Charged Service [member]      
Disclosure of revenue [line items]      
Other revenue 11 17 14
Rental and leasing [member]      
Disclosure of revenue [line items]      
Other revenue R$ 164 189 90
Other [member]      
Disclosure of revenue [line items]      
Other revenue   1 12
Reimbursement For Decontracted Supply [member]      
Disclosure of revenue [line items]      
Other revenue [2]   R$ 65 R$ 145
[1] Revenue recognized for the tariff subsidies applied to users of distribution and transmission services, including low income tariff incentive refunded by Eletrobras.
[2] Reimbursement for suspension of energy supply -Renova.