XML 141 R105.htm IDEA: XBRL DOCUMENT v3.22.1

The balance of these sector financial assets and liabilities, which are presented at net value, in assets or liabilities, in accordance with the tariff adjustments that have been authorized, are as follows: (Details) - BRL (R$) R$ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
IfrsStatementLineItems [Line Items]
Assets	R$ 2,148	R$ 4,058
Current assets	1,505	258
Non-current assets	4,969	3,799
Current liabilities	51	231
Financial assets (liabilities), net	2,097	(98)	R$ 882	R$ 1,080
Amounts Ratified By Aneel In The Last Tariff Adjustment [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	(51)	(162)
Amounts Ratified By Aneel In The Next Tariff Adjustment [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	2,148	64
C V A Account For Compensation Of Changes In Portion A Costs [Member]
IfrsStatementLineItems [Line Items]
Assets	5,122	1,646
Current assets	3,386	918
Non-current assets	1,736	728
Liabilities	(3,025)	(1,744)
Current liabilities	(2,215)	(1,149)
Non-current liabilities	(810)	(595)
Total current, net	1,171	(231)
Total non-current, net	926	133
Financial assets (liabilities), net	2,097	(98)
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Quota For The Energy Development Account [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	(67)	1
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Tariff For Use Of Transmission Facilities Of Grid Participants [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	243	219
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Tariff For Transport Of Electricity Provided By Itaiputs [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	12	18
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Program To Encourage Alternative Sources Of Electricity Proinfa [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	30	6
C V A Account For Compensation Of Changes In Portion A Costs [Member] | System Service Charges And Reserve Energy Charge [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	984	38
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Energy Purchased For Resale [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	1,568	453
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Overcontracting Of Supply [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	125	109
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Neutrality Of Portion A [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	97	107
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Billingreturn [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	(371)	(481)
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Other Financial Items [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	(456)	(504)
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Excess Demand And Reactive Power [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	(68)	(64)
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member]
IfrsStatementLineItems [Line Items]
Assets	989	84
Current assets	989	84
Non-current assets
Liabilities	(1,040)	(246)
Current liabilities	(1,040)	(246)
Non-current liabilities
Total current, net	(51)	(162)
Total non-current, net
Financial assets (liabilities), net	(51)	(162)
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Quota For The Energy Development Account [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	24	1
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Tariff For Use Of Transmission Facilities Of Grid Participants [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	146
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Tariff For Transport Of Electricity Provided By Itaiputs [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	13
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Program To Encourage Alternative Sources Of Electricity Proinfa [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	11
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | System Service Charges And Reserve Energy Charge [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	31	(1)
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Energy Purchased For Resale [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	390	4
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Overcontracting Of Supply [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	(68)	(56)
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Neutrality Of Portion A [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	24	(3)
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Billingreturn [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	(371)	(86)
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Other Financial Items [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	(230)
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Excess Demand And Reactive Power [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	(21)	(22)
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member]
IfrsStatementLineItems [Line Items]
Assets	4,133	1,562
Current assets	2,397	834
Non-current assets	1,736	728
Liabilities	(1,985)	(1,498)
Current liabilities	(1,175)	(903)
Non-current liabilities	(810)	(595)
Total current, net	1,222	(69)
Total non-current, net	926	133
Financial assets (liabilities), net	2,148	64
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Quota For The Energy Development Account [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	(91)
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Tariff For Use Of Transmission Facilities Of Grid Participants [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	97	218
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Tariff For Transport Of Electricity Provided By Itaiputs [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	(1)	18
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Program To Encourage Alternative Sources Of Electricity Proinfa [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	19	6
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | System Service Charges And Reserve Energy Charge [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	953	39
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Energy Purchased For Resale [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	1,178	449
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Overcontracting Of Supply [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	193	165
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Neutrality Of Portion A [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	73	110
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Billingreturn [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net		(395)
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Other Financial Items [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	(226)	(504)
C V A Account For Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Excess Demand And Reactive Power [Member]
IfrsStatementLineItems [Line Items]
Financial assets (liabilities), net	R$ (47)	R$ (42)

X

- References

No definition available.

+ Details

Name:	cig_CurrentFinancialAssetsLiabilitiesNet
Namespace Prefix:	cig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	cig_FinancialAssetsLiabilitiesNet
Namespace Prefix:	cig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	cig_IfrsStatementLineItems
Namespace Prefix:	cig_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	cig_NoncurrentFinancialAssetsLiabilitiesNet
Namespace Prefix:	cig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of current financial assets. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_CurrentFinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of current financial liabilities. [Refer: Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard
-URIDate 2021-03-24

+ Details

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

X

- Definition

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard
-URIDate 2021-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 35H
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35H&doctype=Standard
-URIDate 2021-03-24

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 35I
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35I&doctype=Standard
-URIDate 2021-03-24

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 35M
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35M&doctype=Standard
-URIDate 2021-03-24

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 35N
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35N&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_FinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard
-URIDate 2021-03-24

+ Details

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

X

- Definition

The amount of non-current financial assets. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_NoncurrentFinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of non-current financial liabilities. [Refer: Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard
-URIDate 2021-03-24

+ Details

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

X

- Details

Name:	ifrs-full_ClassesOfAssetsAxis=cig_AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfAssetsAxis=cig_AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_AssetsAndLiabilitiesAxis=cig_CVAAccountForCompensationOfChangesInPortionACostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_QuotaForTheEnergyDevelopmentAccountMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_TariffForUseOfTransmissionFacilitiesOfGridParticipantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_TariffForTransportOfElectricityProvidedByItaiputsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_ProgramToEncourageAlternativeSourcesOfElectricityProinfaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_SystemServiceChargesAndReserveEnergyChargeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_EnergyPurchasedForResaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_OvercontractingOfSupplyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_NeutralityOfPortionAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_BillingreturnMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_OtherFinancialItemsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_ExcessDemandAndReactivePowerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: