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Customers, Traders and Power Transport Concession Holders - Summary of Provision for Allowance for Doubtful Accounts (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Disclosure of financial assets [line items] |  |  |  |
Allowance account for credit losses of financial assets | R$ 568 | R$ 660 | R$ 625 | R$ 650
Residential [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Allowance account for credit losses of financial assets | 160 | 245 |  |
Industrial [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Allowance account for credit losses of financial assets | 178 | 133 |  |
Commercial, services and others [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Allowance account for credit losses of financial assets | 117 | 152 |  |
Rural [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Allowance account for credit losses of financial assets | 17 | 24 |  |
Public authorities [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Allowance account for credit losses of financial assets | 12 | 10 |  |
Public Lighting [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Allowance account for credit losses of financial assets | 5 | 5 |  |
Public service [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Allowance account for credit losses of financial assets | 10 | 15 |  |
Charges for use of the network-TUSD [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Allowance account for credit losses of financial assets | 68 | 68 |  |
Other [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Allowance account for credit losses of financial assets | R$ 1 | R$ 8 |  |

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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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