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Revenues - Summary of the Supply of Electricity by Type of Consumer (Detail)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
BRL (R$)
GWh
Dec. 31, 2017
BRL (R$)
GWh
Dec. 31, 2016
BRL (R$)
GWh
Disclosure of revenue [line Items]      
Supply of electricity in GWh | GWh 43,522 42,461 43,046
Own consumption | GWh 41 37 37
Unbilled revenue | GWh 0 0 0
Supply of electricity including own consumption and not invoiced | GWh 43,563 42,498 43,083
Wholesale supply to other concession holders | GWh 11,992 12,777 12,509
Wholesale supply unbilled, net | GWh 0 0 0
Total | GWh 55,555 55,275 55,592
Revenue from sale of electricity | R$ R$ 21,834 R$ 20,378 R$ 20,657
Own consumption | R$ 48    
Unbilled revenue | R$   61 (199)
Supply of electricity including own consumption and not invoiced | R$ 21,882 20,439 20,458
Wholesale supply to other concession holders | R$ 3,002 1,727 2,713
Wholesale supply unbilled, net | R$ (12) 1,535 259
Revenue from sale of electricity | R$ R$ 24,872 R$ 23,701 R$ 23,430
Electricity Distribution [member] | Residential [member]      
Disclosure of revenue [line Items]      
Supply of electricity in GWh | GWh 10,267 10,008 9,916
Revenue from sale of electricity | R$ R$ 8,658 R$ 7,842 R$ 7,819
Electricity Distribution [member] | Industrial [member]      
Disclosure of revenue [line Items]      
Supply of electricity in GWh | GWh 17,689 17,761 19,494
Revenue from sale of electricity | R$ R$ 4,893 R$ 4,907 R$ 5,396
Electricity Distribution [member] | Commercial, services and others [member]      
Disclosure of revenue [line Items]      
Supply of electricity in GWh | GWh 8,380 7,507 6,573
Revenue from sale of electricity | R$ R$ 4,683 R$ 4,342 R$ 4,359
Electricity Distribution [member] | Rural [member]      
Disclosure of revenue [line Items]      
Supply of electricity in GWh | GWh 3,615 3,651 3,575
Revenue from sale of electricity | R$ R$ 1,794 R$ 1,629 R$ 1,463
Electricity Distribution [member] | Public authorities [member]      
Disclosure of revenue [line Items]      
Supply of electricity in GWh | GWh 871 866 886
Revenue from sale of electricity | R$ R$ 575 R$ 532 R$ 545
Electricity Distribution [member] | Public Lighting [member]      
Disclosure of revenue [line Items]      
Supply of electricity in GWh | GWh 1,384 1,367 1,350
Revenue from sale of electricity | R$ R$ 585 R$ 537 R$ 528
Electricity Distribution [member] | Public service [member]      
Disclosure of revenue [line Items]      
Supply of electricity in GWh | GWh 1,316 1,301 1,252
Revenue from sale of electricity | R$ R$ 646 R$ 589 R$ 547