XML 222 R186.htm IDEA: XBRL DOCUMENT v3.22.1

Schedule of changes in value of options (Details) - Put option - SAAG [member] - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2018
IfrsStatementLineItems [Line Items]
Balance	R$ 536	R$ 483
Adjustment to fair value	100	53	R$ 64
Balance	R$ 636	R$ 536	R$ 419

X

- Definition

Adjustment to fair value of options.

+ References

No definition available.

+ Details

Name:	cig_AdjustmentToFairValueOfOptions
Namespace Prefix:	cig_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	cig_IfrsStatementLineItems
Namespace Prefix:	cig_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_DerivativeFinancialLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_PutOptionSAAGMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: