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30. RELATED PARTY TRANSACTIONS (Details 3) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of transactions between related parties [abstract]
Remuneration	R$ 27	R$ 25	R$ 34
Profit sharing (reversal)	9	6	4
Pension plans	1	1	3
Total	R$ 37	R$ 32	R$ 41

X

- Definition

Key management personnel assistance benefits.

+ References

No definition available.

+ Details

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Namespace Prefix:	cig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Key management personnel compensation salaries and other benefits.

+ References

No definition available.

+ Details

Name:	cig_KeyManagementPersonnelCompensationSalariesAndOtherBenefits
Namespace Prefix:	cig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Key management personnel profit shares (reversals).

+ References

No definition available.

+ Details

Name:	cig_KeyManagementPersonnelProfitSharesReversals
Namespace Prefix:	cig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2020-01-01
-Paragraph 17
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_17&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration