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Revenues - Summary of the Supply of Electricity by Type of Consumer (Detail) R$ in Millions | 12 Months Ended
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Dec. 31, 2017 BRL (R$) GWh | Dec. 31, 2016 BRL (R$) GWh | Dec. 31, 2015 BRL (R$) GWh
Disclosure of revenue [Line Items] |  |  |
Supply of electricity in GWh | GWh | 42,461 | 43,046 | 46,035
Own consumption | GWh | 37 | 37 | 38
Unbilled revenue | GWh | 0 | 0 | 0
Supply of electricity including own consumption and not invoiced | GWh | 42,498 | 43,083 | 46,073
Wholesale supply to other concession holders | GWh | 12,777 | 12,509 | 10,831
Wholesale supply unbilled, net | GWh | 0 | 0 | 0
Total | GWh | 55,275 | 55,592 | 56,904
Revenue from sale of electricity | R$ | R$ 20,378 | R$ 20,657 | R$ 20,062
Own consumption | R$ | 0 | 0 | 0
Unbilled revenue | R$ | 61 | (199) | 257
Supply of electricity including own consumption and not invoiced | R$ | 20,439 | 20,458 | 20,319
Wholesale supply to other concession holders | R$ | 1,727 | 2,713 | 2,358
Wholesale supply unbilled, net | R$ | 1,535 | 259 | (151)
Revenue from sale of electricity | R$ | R$ 23,701 | R$ 23,430 | R$ 22,526
Electricity Distribution [member] | Residential [member] |  |  |
Disclosure of revenue [Line Items] |  |  |
Supply of electricity in GWh | GWh | 10,008 | 9,916 | 9,830
Revenue from sale of electricity | R$ | R$ 7,842 | R$ 7,819 | R$ 7,297
Electricity Distribution [member] | Industrial [member] |  |  |
Disclosure of revenue [Line Items] |  |  |
Supply of electricity in GWh | GWh | 17,761 | 19,494 | 22,969
Revenue from sale of electricity | R$ | R$ 4,907 | R$ 5,396 | R$ 5,781
Electricity Distribution [member] | Commercial, services and others [member] |  |  |
Disclosure of revenue [Line Items] |  |  |
Supply of electricity in GWh | GWh | 7,507 | 6,573 | 6,434
Revenue from sale of electricity | R$ | R$ 4,342 | R$ 4,359 | R$ 3,956
Electricity Distribution [member] | Rural [member] |  |  |
Disclosure of revenue [Line Items] |  |  |
Supply of electricity in GWh | GWh | 3,651 | 3,575 | 3,380
Revenue from sale of electricity | R$ | R$ 1,629 | R$ 1,463 | R$ 1,407
Electricity Distribution [member] | Public authorities [member] |  |  |
Disclosure of revenue [Line Items] |  |  |
Supply of electricity in GWh | GWh | 866 | 886 | 892
Revenue from sale of electricity | R$ | R$ 532 | R$ 545 | R$ 548
Electricity Distribution [member] | Public Lighting [member] |  |  |
Disclosure of revenue [Line Items] |  |  |
Supply of electricity in GWh | GWh | 1,367 | 1,350 | 1,326
Revenue from sale of electricity | R$ | R$ 537 | R$ 528 | R$ 533
Electricity Distribution [member] | Public service [member] |  |  |
Disclosure of revenue [Line Items] |  |  |
Supply of electricity in GWh | GWh | 1,301 | 1,252 | 1,204
Revenue from sale of electricity | R$ | R$ 589 | R$ 547 | R$ 540

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