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29. REVENUE (Details 2) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of revenue [line items]      
Other revenue R$ 1,722 R$ 1,585 R$ 1,484
Tariff Subsidies [Member]      
Disclosure of revenue [line items]      
Other revenue [1] 1,266 1,136 1,034
Services rendered [Member]      
Disclosure of revenue [line items]      
Other revenue 183 188 156
Charged Service [Member]      
Disclosure of revenue [line items]      
Other revenue 17 14 10
Rental And Leasing [Member]      
Disclosure of revenue [line items]      
Other revenue 189 90 121
Telecommunication Services [Member]      
Disclosure of revenue [line items]      
Other revenue 149
Other [member]      
Disclosure of revenue [line items]      
Other revenue 2 12 R$ 14
Reimbursement For Decontracted Supply [Member]      
Disclosure of revenue [line items]      
Other revenue 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.