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Customers, Traders and Power Transport Concession Holders - Summary of Trade and Other Receivables (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Disclosure of trade and other receivables [Line Items] |  |  |  |
Billed supply | R$ 2,687 | R$ 2,568 |  |
Unbilled supply | 994 | 920 |  |
Other concession holders - wholesale supply | 26 | 80 |  |
Other concession holders - wholesale supply, unbilled | 283 | 343 |  |
CCEE (Wholesale Trading Exchange) | 382 | 1 |  |
Concession Holders - power transport | 159 | 124 |  |
Concession Holders - power transport, unbilled | 177 | 195 |  |
(-) Provision for doubtful receivables | (568) | (660) | R$ (625) | R$ (650)
Trade and other receivables | 4,140 | 3,571 |  |
Current assets | 3,885 | 3,425 |  |
Non-current assets | 255 | R$ 146 |  |
Balances not yet due [member] |  |  |  |
Disclosure of trade and other receivables [Line Items] |  |  |  |
Billed supply | 1,309 |  |  |
Unbilled supply | 994 |  |  |
Other concession holders - wholesale supply | 9 |  |  |
Other concession holders - wholesale supply, unbilled | 283 |  |  |
CCEE (Wholesale Trading Exchange) | 255 |  |  |
Concession Holders - power transport | 75 |  |  |
Concession Holders - power transport, unbilled | 177 |  |  |
Trade and other receivables | 3,102 |  |  |
Up to 90 days past due [member] |  |  |  |
Disclosure of trade and other receivables [Line Items] |  |  |  |
Billed supply | 698 |  |  |
Other concession holders - wholesale supply | 21 |  |  |
CCEE (Wholesale Trading Exchange) | 119 |  |  |
Concession Holders - power transport | 5 |  |  |
Trade and other receivables | 843 |  |  |
More than 90 days past due [member] |  |  |  |
Disclosure of trade and other receivables [Line Items] |  |  |  |
Billed supply | 680 |  |  |
Other concession holders - wholesale supply | (4) |  |  |
CCEE (Wholesale Trading Exchange) | 8 |  |  |
Concession Holders - power transport | 79 |  |  |
(-) Provision for doubtful receivables | (568) |  |  |
Trade and other receivables | R$ 195 |  |  |

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