XML 136 R100.htm IDEA: XBRL DOCUMENT
v3.22.1

REIMBURSEMENT OF TARIFF SUBSIDIES (Details Narrative) - BRL (R$) | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
IfrsStatementLineItems [Line Items] |  |  |
[custom:CurrentSubsidyReceivable1-0] | R$ 205 |  |
[custom:SubsidiesRevenueRecognized-0] | 986 | R$ 1,036 | R$ 1,097
Cemig D [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
[custom:CurrentSubsidyReceivable-0] | 86 | 82 | R$ 83
Ceming G T [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
[custom:CurrentSubsidyReceivable-0] | R$ 4 | R$ 6 |

X
- References No definition available. + Details
Name: | cig_CurrentSubsidyReceivable
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | cig_CurrentSubsidyReceivable1
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_SubsidiesRevenueRecognized
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=cig_CemigDMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=cig_CemingGTMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |