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Related Party Transactions - Summary of Cemig is Provider of Surety or Guarantee of Loans, Financings and Debentures of Related Parties (Detail)	12 Months Ended
	Dec. 31, 2018 BRL (R$)
Disclosure of transactions between related parties [line items]
Related party transaction amount	R$ 4,538
Norte Energia S.A [Member]
Disclosure of transactions between related parties [line items]
Related party	Norte Energia (NESA)
Relationship	Affiliated
Type	Surety
Objective	Financing
Related party transaction amount	R$ 2,571
Maturity	2042
Light [member]
Disclosure of transactions between related parties [line items]
Related party	Light (1)
Relationship	Subsidiary
Type	Counter-guarantee
Objective	Financing
Related party transaction amount	R$ 684
Maturity	2042
Santo Antnio Energia S.A. [member]
Disclosure of transactions between related parties [line items]
Related party	Santo Antônio Energia (SAESA) (2)
Relationship	Jointly-controlled entity
Type	Surety
Objective	Financing
Related party transaction amount	R$ 875
Maturity	2034
Santo Antnio Energia S.A. One [member]
Disclosure of transactions between related parties [line items]
Related party	Santo Antônio Energia (SAESA) (2)
Relationship	Jointly-controlled entity
Type	Surety
Objective	Debentures
Related party transaction amount	R$ 401
Maturity	2037
Centroeste [member]
Disclosure of transactions between related parties [line items]
Related party	Centroeste
Relationship	Jointly-controlled entity
Type	Surety
Objective	Financing
Related party transaction amount	R$ 7
Maturity	2023

X

- Definition

The description of the nature of the related party relationships. [Refer: Related parties [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2018-01-01
-Paragraph 18
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-URIDate 2018-03-16

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- Definition

The description of related party transactions. [Refer: Related parties [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2018-01-01
-Paragraph 18
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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.

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No definition available.

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- Definition

Description of type of guarantee.

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- Definition

Expiration year

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- Definition

Name of related party

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- Definition

Related Party Transaction Amounts Of Transaction1

+ References

No definition available.

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- Details

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