XML 129 R108.htm IDEA: XBRL DOCUMENT v3.21.1

12. ESCROW DEPOSITS (Details Narrative) - BRL (R$) R$ in Millions	Dec. 31, 2020	Feb. 13, 2020
Disclosure of escrow deposits [line items]
Escrow deposits	R$ 6
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

X

- 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

X

- 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: