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Intangible Assets - Summary of Changes in Intangible Assets (Parenthetical) (Detail) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]
Assets of concession	R$ 166
Special obligations, write down		R$ 98
Wind power projects [member]
Disclosure of detailed information about intangible assets [line items]
Assets of concession	R$ 162
Parent [member] | Luz Para Todos Program [member]
Disclosure of detailed information about intangible assets [line items]
Special obligations, write down		R$ 98

X

- Definition

The increase in intangible assets other than goodwill resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2018-01-01
-Paragraph 118
-Subparagraph e
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_i&doctype=Standard
-URIDate 2018-03-16

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The increase (decrease) in intangible assets other than goodwill resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 38
-IssueDate 2018-01-01
-Paragraph 118
-Subparagraph e
-Clause viii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_viii&doctype=Standard
-URIDate 2018-03-16

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