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Revenues - Summary of Net Operating Revenue (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue [abstract] |  |  |
Revenue from supply of energy | R$ 23,701 | R$ 23,430 | R$ 22,526
Revenue from use of the electricity distribution systems (TUSD) | 1,611 | 1,705 | 1,465
CVA, and Other financial components in tariff increases | 988 | (1,455) | 1,704
Transmission concession revenue | 371 | 312 | 261
Transmission construction revenue | 25 | 54 | 146
Transmission indemnity revenue | 373 | 751 | 101
Generation indemnity revenue | 271 |  |
Distribution construction revenue | 1,094 | 1,139 | 1,106
Adjustment to expectation of cash flow from indemnifiable Financial asset of distribution concession | 9 | 8 | 576
Revenue from financial updating of the Concession Grant Fee | 317 | 300 |
Energy transactions on the CCEE | 860 | 161 | 2,425
Supply of gas | 1,759 | 1,444 | 1,667
Other operating revenues | 1,484 | 1,421 | 1,440
Deductions on revenue | (11,151) | (10,497) | (11,549)
Net operating revenue | R$ 21,712 | R$ 18,773 | R$ 21,868

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- Definition The amount of revenue arising from construction contracts. Construction contracts are contracts specifically negotiated for the construction of an asset or a combination of assets that are closely interrelated or interdependent in terms of their design, technology and function or their ultimate purpose or use. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IAS -Number 11 -IssueDate 2017-01-01 -Paragraph 39 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=11&date=2017-03-02&anchor=para_39_a&doctype=Standard&book=B -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IAS -Number 18 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=18&date=2017-03-02&anchor=para_35_b&doctype=Standard&book=B -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRIC -Number 15 -IssueDate 2017-01-01 -Paragraph 20 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRIC&num=15&date=2017-03-02&anchor=para_20_b&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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