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Concession Financial Assets and Liabilities - Additional Information (Detail) R$ in Millions |  |  | 11 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2016 BRL (R$) | Jan. 04, 2016 BRL (R$) | Nov. 30, 2017 BRL (R$) | Dec. 31, 2017 BRL (R$) | Dec. 31, 2016 BRL (R$) Plant | Dec. 31, 2015 BRL (R$) | Aug. 16, 2016 BRL (R$) | Dec. 31, 2014 BRL (R$)
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items] |  |  |  |  |  |  |  |
Homologated amount |  |  |  |  |  |  | R$ 892 |
Financial assets |  |  |  | R$ 7,453 | R$ 5,701 |  |  |
Remuneration payment period |  |  |  | 8 years |  |  |  |
Extensions of concessions, tariff maximum amount |  |  |  | R$ 993 |  |  |  |
Extension of the concessions |  |  |  | 316 |  |  |  |
Adjustment of BRR of transmission assets |  |  |  | 149 |  |  |  |
Transmission assets receivable |  |  |  | 75 |  |  |  |
Adjusted regulatory remuneration base of assets |  |  |  | 544 |  |  |  |
Net balance of assets deemed cost |  |  |  | 816 | 547 |  |  |
Investments |  |  |  | 7,792 | R$ 8,694 | R$ 9,717 |  | R$ 8,040
Grant acquisition period |  |  |  |  | 30 years |  |  |
Acquisition payment percentage | 35.00% | 65.00% |  |  |  |  |  |
Remaining 35% of acquisition payment |  | R$ 776 |  |  |  |  |  |
Remaining 35% of acquisition payment updated | R$ 828 |  |  |  |  |  |  |
Pass-throughs of funds |  |  | R$ 583 | 586 | R$ 341 | R$ 1,124 |  |
Jaguara hydroelectric plant [member] |  |  |  |  |  |  |  |
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items] |  |  |  |  |  |  |  |
Investments |  |  |  | 174 |  |  |  |
Sao simao hydroelectric plant [member] |  |  |  |  |  |  |  |
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items] |  |  |  |  |  |  |  |
Investments |  |  |  | 3 |  |  |  |
Miranda hydroelectric plant [member] |  |  |  |  |  |  |  |
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items] |  |  |  |  |  |  |  |
Investments |  |  |  | 23 |  |  |  |
Subsidiaries [member] |  |  |  |  |  |  |  |
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items] |  |  |  |  |  |  |  |
Transmission assets receivable |  |  |  | 548 |  |  |  |
Financial assets [member] |  |  |  |  |  |  |  |
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items] |  |  |  |  |  |  |  |
Financial assets |  |  |  | 7,084 | 5,303 |  |  |
Transmission Indemnity receivable [member] | Financial assets [member] |  |  |  |  |  |  |  |
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items] |  |  |  |  |  |  |  |
Financial assets |  |  |  | R$ 1,928 |  |  |  |
Customer Charges - Tariff Flag Amounts [member] |  |  |  |  |  |  |  |
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items] |  |  |  |  |  |  |  |
Pass-throughs of funds |  |  |  |  | R$ 3 |  |  |
Other disposals of assets [member] | Regulated market [member] |  |  |  |  |  |  |  |
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items] |  |  |  |  |  |  |  |
Output sales percentage |  |  |  | 70.00% |  |  |  |
Other disposals of assets [member] | Electricity acquired in the Free Market [member] |  |  |  |  |  |  |  |
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items] |  |  |  |  |  |  |  |
Output sales percentage |  |  |  | 30.00% |  |  |  |
Hydro electric Plant [member] |  |  |  |  |  |  |  |
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items] |  |  |  |  |  |  |  |
Number of plants | Plant |  |  |  |  | 18 |  |  |
Cost of acquisition |  |  |  |  | R$ 2,216 |  |  |

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