XML 126 R99.htm IDEA: XBRL DOCUMENT
v3.20.1

8. RECEIVABLES FROM CUSTOMERS, TRADERS AND POWER TRANSPORT CONCESSION HOLDERS (Details Narrative) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 BRL (R$)
Cemig Distribuicao SA [Member] |
Disclosure Of Advances From Customers [line items] |
Reduction in doubtful accounts | R$ 46

X
- Definition The amount of reduction in doubtful accounts. + References No definition available. + Details
Name: | cig_DecreaseInDoubtfulAccounts
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Disclosure Of Advances From Customers [line items] + References No definition available. + Details
Name: | cig_DisclosureOfAdvancesFromCustomersLineItems
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigDistribuicaoSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |