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30. OPERATING COSTS AND EXPENSES (Details 2) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale R$ 11,286 R$ 11,084 R$ 10,919
Free Market [Member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale 4,098 3,871 4,283
Proinfa Program [Member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale 376 324 303
Physical Guarantee Quota Contracts [Member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale 715 679 461
Regulated Market Auctions [Member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale 3,021 3,346 3,555
Bilateral Contracts [Member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale 311 484 385
Angra I And II Nuclear Plants [Member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale 269 267 244
Pasep and Cofins Credits [Member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale (1,026) (1,056) (1,053)
Itaipu Binacional [Member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale 1,429 1,351 1,243
Spot Market [Member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale 1,886 R$ 1,818 R$ 1,498
Distributed Generation [member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale R$ 207