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29. REVENUE (Details 3) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 29, 2016
Jan. 02, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of revenue [line items]          
Taxes on revenues     R$ 9,282 R$ 8,765 R$ 8,547
Charges to the consumer     3,054 3,547 2,604
Deductions from revenue     12,336 12,312 11,151
Tax rate for customers in the Commercial, services and other activities 25.00% 18.00%      
Research and development [Member]          
Disclosure of revenue [line items]          
Charges to the consumer     41 38 38
National scientific and technological development fund [Member]          
Disclosure of revenue [line items]          
Charges to the consumer     41 38 38
Proinfa alternative source [Member]          
Disclosure of revenue [line items]          
Charges to the consumer     52 40 39
Other Taxes [Member]          
Disclosure of revenue [line items]          
Taxes on revenues     8 8 8
Pis and pasep tax [Member]          
Disclosure of revenue [line items]          
Taxes on revenues     521 553 455
ICMS - State VAT [Member]          
Disclosure of revenue [line items]          
Taxes on revenues     6,358 5,657 5,847
Cofins tax [Member]          
Disclosure of revenue [line items]          
Taxes on revenues     2,395 2,547 2,237
Energy services inspection fee [Member]          
Disclosure of revenue [line items]          
Charges to the consumer     30 26 29
Customer charges - the 'Flag Tariff' system [Member]          
Disclosure of revenue [line items]          
Charges to the consumer     294 655 454
Royalty on water resource [Member]          
Disclosure of revenue [line items]          
Charges to the consumer     43 45 92
Energy system expansion research [Member]          
Disclosure of revenue [line items]          
Charges to the consumer     20 19 19
Energy development account [Member]          
Disclosure of revenue [line items]          
Charges to the consumer     2,448 2,603 1,822
Energy efficiency program [Member]          
Disclosure of revenue [line items]          
Charges to the consumer     69 64 56
Global reversion reserve [Member]          
Disclosure of revenue [line items]          
Charges to the consumer     R$ 16 R$ 19 R$ 17