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29. REVENUE (Details Narrative) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Revenue [abstract] |  |
Transmission concession revenue | R$ 15 | R$ 13
Variable portion of transmission revenue | R$ 9 | R$ 11

X
- Definition Transmission concession revenue. + References No definition available. + Details
Name: | cig_TransmissionConcessionRevenue
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represent information about the variable portion of transmission revenue. + References No definition available. + Details
Name: | cig_VariablePortionOfTransmissionRevenue
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | ifrs-full_RevenueAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration