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

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

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- 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: