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Concession Financial Assets and Liabilities - Summary of Financial Assets and Financial Liabilities With the Tariff Adjustments (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Assets | R$ 7,453 | R$ 5,701
Current assets | 848 | 730
Non-current assets | 6,605 | 4,971
Current liabilities | 415 | 482
Non-current liabilities |  | 323
CVA account for compensation of changes in portion A costs [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Assets | 2,713 | 2,369
Current assets | 1,761 | 1,991
Non-current assets | 952 | 378
Liabilities | (2,759) | (2,776)
Current liabilities | (2,018) | (2,075)
Non-current liabilities | (741) | (701)
Total current, net | (257) | (84)
Total non-current,net | 211 | (323)
Alternative power source program (Proinfa) | (46) | (407)
CVA account for compensation of changes in portion A costs [member] | Amounts ratified by Aneel in the last tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Assets | 382 | 1,444
Current assets | 382 | 1,444
Liabilities | (797) | (1,046)
Current liabilities | (797) | (1,046)
Total current, net | (415) | 398
Alternative power source program (Proinfa) | (415) | 398
CVA account for compensation of changes in portion A costs [member] | Amounts ratified by Aneel in the next tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Assets | 2,331 | 925
Current assets | 1,379 | 547
Non-current assets | 952 | 378
Liabilities | (1,962) | (1,730)
Current liabilities | (1,221) | (1,029)
Non-current liabilities | (741) | (701)
Total current, net | 158 | (482)
Total non-current,net | 211 | (323)
Alternative power source program (Proinfa) | 369 | (805)
CVA account for compensation of changes in portion A costs [member] | Quota for the Energy Development Account [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | (244) | (42)
CVA account for compensation of changes in portion A costs [member] | Quota for the Energy Development Account [member] | Amounts ratified by Aneel in the last tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | (154) | 203
CVA account for compensation of changes in portion A costs [member] | Quota for the Energy Development Account [member] | Amounts ratified by Aneel in the next tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | (90) | (245)
CVA account for compensation of changes in portion A costs [member] | Tariff for Use of Transmission Facilities of Grid Participants [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | 33 | 10
CVA account for compensation of changes in portion A costs [member] | Tariff for Use of Transmission Facilities of Grid Participants [member] | Amounts ratified by Aneel in the last tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | 9 | 2
CVA account for compensation of changes in portion A costs [member] | Tariff for Use of Transmission Facilities of Grid Participants [member] | Amounts ratified by Aneel in the next tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | 24 | 8
CVA account for compensation of changes in portion A costs [member] | Tariff for Transport of Electricity Provided by Itaiputs [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | 4 | 10
CVA account for compensation of changes in portion A costs [member] | Tariff for Transport of Electricity Provided by Itaiputs [member] | Amounts ratified by Aneel in the last tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | 2 | 6
CVA account for compensation of changes in portion A costs [member] | Tariff for Transport of Electricity Provided by Itaiputs [member] | Amounts ratified by Aneel in the next tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | 2 | 4
CVA account for compensation of changes in portion A costs [member] | Program to Encourage Alternative Sources of Electricity Proinfa [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | (4) | 17
CVA account for compensation of changes in portion A costs [member] | Program to Encourage Alternative Sources of Electricity Proinfa [member] | Amounts ratified by Aneel in the last tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | (5) | 13
CVA account for compensation of changes in portion A costs [member] | Program to Encourage Alternative Sources of Electricity Proinfa [member] | Amounts ratified by Aneel in the next tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | 1 | 4
CVA account for compensation of changes in portion A costs [member] | System Service Charges and Reserve Energy Charge [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | (627) | (244)
CVA account for compensation of changes in portion A costs [member] | System Service Charges and Reserve Energy Charge [member] | Amounts ratified by Aneel in the last tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | (40) | (55)
CVA account for compensation of changes in portion A costs [member] | System Service Charges and Reserve Energy Charge [member] | Amounts ratified by Aneel in the next tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | (587) | (189)
CVA account for compensation of changes in portion A costs [member] | Electricity Purchased for Resale [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | 1,236 | 344
CVA account for compensation of changes in portion A costs [member] | Electricity Purchased for Resale [member] | Amounts ratified by Aneel in the last tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | (91) | 423
CVA account for compensation of changes in portion A costs [member] | Electricity Purchased for Resale [member] | Amounts ratified by Aneel in the next tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | 1,327 | (79)
CVA account for compensation of changes in portion A costs [member] | Overcontracting of Supply [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | (203) | (160)
CVA account for compensation of changes in portion A costs [member] | Overcontracting of Supply [member] | Amounts ratified by Aneel in the last tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | 8 | (104)
CVA account for compensation of changes in portion A costs [member] | Overcontracting of Supply [member] | Amounts ratified by Aneel in the next tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | (211) | (56)
CVA account for compensation of changes in portion A costs [member] | Neutrality of Portion A [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | 43 | 1
CVA account for compensation of changes in portion A costs [member] | Neutrality of Portion A [member] | Amounts ratified by Aneel in the last tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | (30) | 77
CVA account for compensation of changes in portion A costs [member] | Neutrality of Portion A [member] | Amounts ratified by Aneel in the next tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | 73 | (76)
CVA account for compensation of changes in portion A costs [member] | Other Financial Items [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | (112) | (329)
CVA account for compensation of changes in portion A costs [member] | Other Financial Items [member] | Amounts ratified by Aneel in the last tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | (112) | (167)
CVA account for compensation of changes in portion A costs [member] | Other Financial Items [member] | Amounts ratified by Aneel in the next tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) |  | (162)
CVA account for compensation of changes in portion A costs [member] | Customer Charges - Tariff Flag Amounts [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | (134) | (14)
CVA account for compensation of changes in portion A costs [member] | Customer Charges - Tariff Flag Amounts [member] | Amounts ratified by Aneel in the next tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | (134) | R$ (14)
CVA account for compensation of changes in portion A costs [member] | Excess demand and reactive power [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | (38) |
CVA account for compensation of changes in portion A costs [member] | Excess demand and reactive power [member] | Amounts ratified by Aneel in the last tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | (2) |
CVA account for compensation of changes in portion A costs [member] | Excess demand and reactive power [member] | Amounts ratified by Aneel in the next tariff adjustment [member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Alternative power source program (Proinfa) | R$ (36) |

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