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Concessions and Authorizations - Schedule of Nominal Value and Present Value Portion to Be paid (Detail)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
BRL (R$)
Irape enterprise [member]  
Disclosure Of Present Value And Nominal Value Portion To Be Paid [line items]  
Percentage interest 100.00%
Amounts paid in 2018 R$ 1,762
Nominal value of amounts to be paid in the next 12 months 2,019
Present value of amounts to be paid in the next 12 months R$ 1,902
Queimadao Consortium Enterprise [member]  
Disclosure Of Present Value And Nominal Value Portion To Be Paid [line items]  
Percentage interest 82.50%
Amounts paid in 2018 R$ 501
Nominal value of amounts to be paid in the next 12 months 588
Present value of amounts to be paid in the next 12 months R$ 554
Salto morais hydroelectric plants [member]  
Disclosure Of Present Value And Nominal Value Portion To Be Paid [line items]  
Percentage interest 100.00%
Amounts paid in 2018 R$ 12
Rio De Pedras Hydroelectric Plants [member]  
Disclosure Of Present Value And Nominal Value Portion To Be Paid [line items]  
Percentage interest 100.00%
Amounts paid in 2018 R$ 35
Various Small Hydro Plants Enterprise [member]  
Disclosure Of Present Value And Nominal Value Portion To Be Paid [line items]  
Percentage interest 100.00%
Amounts paid in 2018 R$ 171