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: |