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Operating Costs And Expenses - Summary of Other Operating Expenses (Revenues), Net (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of other operating income expense [line items]      
Leasing and rentals R$ 93 R$ 103 R$ 112
Advertising 19 30 13
Subsidies and donations 22 19 17
Onerous concession 3 3 3
Insurance 7 8 9
Net loss (gain) on deactivation and disposal of assets 7 193 112
Forluz - Administrative running cost 28 26 25
Collection agents 78 71 70
Fine for violation of service continuity standard (2)   42  
Taxes and charges 9    
Other expenses 106 63 79
Other operating expenses (revenues), net 405 383 155
Energy [member]      
Disclosure of other operating income expense [line items]      
Own consumption of energy 27 24 22
CCEE (Electricity Trading Chamber) [member]      
Disclosure of other operating income expense [line items]      
CCEE annual charge R$ 6 8 8
Taesa [member]      
Disclosure of other operating income expense [line items]      
Gain on disposal, Taesa (1)   R$ (207) (181)
Transchile Charrua Transmision SA [member]      
Disclosure of other operating income expense [line items]      
Gain on disposal, Transchile     R$ (134)