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14. ESCROW DEPOSITS (Details Narrative) R$ in Millions | Feb. 13, 2020 BRL (R$)
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Cemig D and Cemig GT [Member] |
Disclosure of escrow deposits [line items] |
Escrow deposits | R$ 1,382
Ceming GT [Member] |
Disclosure of escrow deposits [line items] |
Escrow deposits | 1,186
Cemig D [Member] |
Disclosure of escrow deposits [line items] |
Escrow deposits | R$ 196

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- Definition Amount in escrow deposits + References No definition available. + Details
Name: | cig_AmountInEscrowDeposits
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represents information about escrow deposits. + References No definition available. + Details
Name: | cig_DisclosureOfEscrowDepositsLineItems
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=cig_CemigDAndCemigGTMember
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: |

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