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30. OPERATING COSTS AND EXPENSES (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Operating Costs And Expenses [abstract]      
Personnel R$ 1,272 R$ 1,410 R$ 1,627
Employees' and managers' profit sharing 263 77 5
Post-employment benefits (reversals) - Note 26 408 337 (229)
Materials 91 104 61
Raw materials and inputs for production of energy   10
Outsourced services 1,239 1,087 974
Energy bought for resale 11,286 11,084 10,919
Depreciation and amortization [1] 958 835 850
Operating provisions and adjustments for operating losses 2,401 466 854
Charges for use of the national grid 1,426 1,480 1,174
Gas bought for resale 1,436 1,238 1,071
Construction costs 1,200 897 1,119
Other operating expenses, net 499 405 383
Operating costs and expenses R$ 22,479 R$ 19,420 R$ 18,818
[1] Net of PIS/Pasep and Cofins taxes applicable to amortization of the right-of-use assets in the amount of R$5.