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28. OPERATING COSTS AND EXPENSES (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Operating Costs And Expenses [line items]      
Personnel R$ 1,276   R$ 1,410
Employees' and managers' profit sharing 142   77
Post-employment benefits (reversals) - Note 24 438   337
Materials 79 R$ 91 104
Outsourced services 1,265 1,239 1,087
Energy bought for resale 12,111   11,084
Depreciation and amortization [1] 989   835
Operating provisions and adjustments for operating losses 423   466 [2]
Charges for use of the national grid 1,748   1,480
Gas bought for resale 1,083   1,238
Construction costs 1,581 1,200 897
Other operating expenses, net 297   405
Operating costs and expenses R$ 21,432 22,475 19,420
Restated [member]      
Disclosure Of Operating Costs And Expenses [line items]      
Personnel   1,272  
Employees' and managers' profit sharing   263  
Post-employment benefits (reversals) - Note 24   408  
Materials   91  
Outsourced services   1,239  
Energy bought for resale   11,286  
Depreciation and amortization [1]   958  
Operating provisions and adjustments for operating losses [3]   2,401 R$ 466
Charges for use of the national grid   1,426  
Gas bought for resale   1,436  
Construction costs   1,200  
Other operating expenses, net   494  
Operating costs and expenses   R$ 22,474  
[1] Net of PIS/Pasep and Cofins taxes applicable to amortization of the right-of-use assets in the amount of R$2.
[2] See note 2.8.
[3] For further details of restatement of comparative balances, see Note 2.8