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Operating Costs And Expenses - Summary of Operating Costs and Expenses (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Operating Costs And Expenses [abstract]      
Personnel R$ 1,410 R$ 1,627 R$ 1,643
Employees' and managers' profit sharing 77 5 7
Post-employment benefits - Note 24 337 (229) 345
Materials 104 61 58
Raw materials and inputs for production of energy   10  
Outsourced services 1,087 974 867
Energy bought for resale 11,084 10,919 8,273
Depreciation and amortization 835 850 834
Operating provisions (reversals) and adjustments for operating losses 466 854 704
Charges for use of the national grid 1,480 1,174 947
Gas bought for resale 1,238 1,071 878
Construction costs 897 1,119 1,193
Other operating expenses, net 405 383 155
Operating costs and expenses R$ 19,420 R$ 18,818 R$ 15,904