XML 123 R109.htm IDEA: XBRL DOCUMENT v3.23.2

CONCESSION CONTRACT ASSETS (Details Narrative) R$ in Millions	12 Months Ended
	Dec. 31, 2022 BRL (R$)
IfrsStatementLineItems [Line Items]
Borrowing costs capitalised	R$ 47
Borrowing costs capitalised	11.36%
Amortization rate	3.00%
Amortization rate	16.11%
Contract 0792020 [Member]
IfrsStatementLineItems [Line Items]
Repositioning factor	50.00%

X

- References

No definition available.

+ Details

Name:	cig_AmortizationRate
Namespace Prefix:	cig_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	cig_AmortizationRate1
Namespace Prefix:	cig_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	cig_BorrowingCostsCapitalisedRate
Namespace Prefix:	cig_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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

- References

No definition available.

+ Details

Name:	cig_RepositioningFactor
Namespace Prefix:	cig_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_CategoriesOfAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomersAxis=cig_Contract0792020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: