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12. ESCROW DEPOSITS (Details) - BRL (R$) R$ in Millions | Dec. 31, 2020 | Dec. 31, 2018
--- | --- | ---
Disclosure of escrow deposits [abstract] |  |  |
Labor claims |  | R$ 278 | R$ 355
Tax contingencies |  |  |
Income tax on Interest on Equity |  | 29 | 29
PIS/Pasep and Cofins taxes | [1] | 66 | 1,448
Donations and legacy tax (ITCD) |  | 54 | 53
Urban property tax (IPTU) |  | 84 | 79
Finsocial tax |  | 40 | 40
Income tax and social contr. tax on indemnity for employees' 'Anuenio' benefit | [1] | 286 | 282
Income tax withheld at source on inflationary profit |  | 9 | 9
Contribution tax effective rate | [1] | 18 | 18
ICMS (VAT) credits on PP&E |  |  | 39
Others | [1] | 98 | 92
Escrow deposits tax issues |  | 684 | 2,089
Others |  |  |
Regulatory |  | 52 | 43
Third party |  | 9 | 11
Customer relations |  | 8 | 7
Court embargo |  | 13 | 12
Others |  | 12 | 23
Escrow deposits other |  | 94 | 96
Long term escrow deposit |  | R$ 1,056 | R$ 2,540
[1] | See more details in Note 25 - Provisions under the section relating to the Anuenio indemnity.

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- Definition Represent information about the contribution tax effective rate1. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Court embargo 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 Customer relations escrow deposits. + References No definition available. + Details
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Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Disclosure of information about escrow deposits. + References No definition available. + Details
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- Definition Donations and legacy tax. + References No definition available. + Details
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Balance Type: | debit
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X
- Definition Escrow deposits labor claims. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

X
- Definition Escrow deposits other. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Disclosure of information about escrow deposits other. + References No definition available. + Details
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- Definition Escrow deposits other tax issues. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Disclosure of information about escrow deposits tax contingencies. + References No definition available. + Details
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Namespace Prefix: | cig_
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- Definition Escrow deposits tax issues. + References No definition available. + Details
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- Definition Finsocial tax. + References No definition available. + Details
Name: | cig_FinSocialTax
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represent information about the icms vat credits on ppe. + References No definition available. + Details
Name: | cig_IcmsVatCreditsOnPpe
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Income And Social Contribution Tax On Indemnity For Employees Anuenio Benefit + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Income tax on interest on equity. + References No definition available. + Details
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Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Represent information about the income tax withheld at source on inflationary profit1. + References No definition available. + Details
Name: | cig_IncomeTaxWithheldAtSourceOnInflationaryProfit1
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
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- Definition Long term escrow deposit. + References No definition available. + Details
Name: | cig_LongTermEscrowDeposit
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Pasep and cofins tax. + References No definition available. + Details
Name: | cig_PasepAndCofinsTax
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Regulatory escrow deposits. + References No definition available. + Details
Name: | cig_RegulatoryEscrowDeposits
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Urban property tax. + References No definition available. + Details
Name: | cig_UrbanPropertyTax
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant