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Schedule of information about amounts recognised in relation to regulatory deferral account balances (Details) - BRL (R$) R$ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Regulatory Charges |  |
Global Reversion Reserve (RGR) | R$ (28) | R$ (28)
Energy Development Account (CDE) | 110 | 64
Grantor inspection fee – ANEEL | 3 | 3
Energy Efficiency Program | 237 | 265
Research and development (R&D) | 112 | 225
Energy System Expansion Research | 4 | 4
National Scientific and Technological Development Fund | 9 | 8
Proinfa – Alternative Energy Program | 17 | 7
Royalties for use of water resources | 5 | 13
Emergency capacity charge | 26 | 26
Customer charges – Tariff flags | 252 | 90
CDE on R&D (1) | 3 |
CDE on EEP | 5 |
Others | 5 | 4
Liability | 816 | 737
Current liabilities | 611 | 446
Non-current liabilities | R$ 205 | R$ 291

X
- Definition Aneel inspection charge. + References No definition available. + Details
Name: | cig_AneelInspectionCharge
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | cig_CdeOnEep
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | cig_CdeOnRAndD
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | cig_CurrentRegulatoryLiability
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Customer charges &amp;amp;#8211; Tariff flags. + References No definition available. + Details
Name: | cig_CustomerChargesTariffFlags
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | cig_DisclosureRegulatoryChargesAbstract
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Emergency capacity charge. + References No definition available. + Details
Name: | cig_EmergencyCapacityCharge
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Energy development account. + References No definition available. + Details
Name: | cig_EnergyDevelopmentAccount
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Energy efficiency program. + References No definition available. + Details
Name: | cig_EnergyEfficiencyProgram
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Energy system expansion research. + References No definition available. + Details
Name: | cig_EnergySystemExpansionResearch
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Global reversion reserve. + References No definition available. + Details
Name: | cig_GlobalReversionReserve
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition National scientific and technological development fund. + References No definition available. + Details
Name: | cig_NationalScientificAndTechnologicalDevelopmentFund
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Noncurrent regulatory liability. + References No definition available. + Details
Name: | cig_NonCurrentRegulatoryLiability
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Other current regulatory liability. + References No definition available. + Details
Name: | cig_OtherCurrentRegulatoryLiability
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Proinfa alternative energy program. + References No definition available. + Details
Name: | cig_ProinfaAlternativeEnergyProgram
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | cig_ResearchAndDevelopmentExpense1
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Royalties for use of water resources. + References No definition available. + Details
Name: | cig_RoyaltiesForUseOfWaterResources
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of regulatory deferral account credit balances and the related deferred tax liability. [Refer: Regulatory deferral account credit balances; Deferred tax liability associated with regulatory deferral account balances] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 14 -IssueDate 2021-01-01 -Paragraph 24 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=14&code=ifrs-tx-2021-en-r&anchor=para_24&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 14 -IssueDate 2021-01-01 -Paragraph B11 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=14&code=ifrs-tx-2021-en-r&anchor=para_B11_a&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
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