XML 181 R145.htm IDEA: XBRL DOCUMENT v3.22.1

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 – 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

X

- 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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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant