XML 168 R147.htm IDEA: XBRL DOCUMENT v3.25.1

Loans and Debentures - Schedule of the Principal Currencies and Indexors Used for Monetary Updating of Loans and Financings (Details)	Dec. 31, 2024	Dec. 31, 2023
IPCA [member]
IfrsStatementLineItems [Line Items]
Accumulated change	4.83%	4.62%
CDI [member]
IfrsStatementLineItems [Line Items]
Accumulated change	10.83%	13.04%

X

- Definition

Borrowings variable rate.

+ References

No definition available.

+ Details

Name:	cig_BorrowingsVariableRate
Namespace Prefix:	cig_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Ifrs Statement Line Items

+ References

No definition available.

+ Details

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

X

- Details

Name:	cig_IndexorsAxis=cig_IPCAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	cig_IndexorsAxis=cig_CDIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: