XML 154 R220.htm IDEA: XBRL DOCUMENT v3.20.1

33. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details 11) - BRL (R$) R$ in Millions		Dec. 31, 2019	Dec. 31, 2018
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities		R$ (18,764)	R$ 18,120
Net assets (liabilities) exposed		922	R$ 712
Probable Scenario [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		4,407
Financial liabilities		(5,922)
Net assets (liabilities) exposed		(1,515)
Net effect of fluctuation in IPCA and IGP-M indices		(16)
Probable Scenario [Member] | Forluz Deficit Of Pension Plan [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities		(557)
Probable Scenario [Member] | Debt Agreed With Pension Fund [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities		(573)
Probable Scenario [Member] | Loans, Financings and Debentures [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities		(4,792)
Possible Scenario [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		4,422
Financial liabilities		(5,942)
Net assets (liabilities) exposed		(1,520)
Net effect of fluctuation in IPCA and IGP-M indices		(21)
Possible Scenario [Member] | Forluz Deficit Of Pension Plan [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities		(559)
Possible Scenario [Member] | Debt Agreed With Pension Fund [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities		(575)
Possible Scenario [Member] | Loans, Financings and Debentures [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities		(4,808)
Remote Scenario [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		4,438
Financial liabilities		(5,961)
Net assets (liabilities) exposed		(1,523)
Net effect of fluctuation in IPCA and IGP-M indices		(24)
Remote Scenario [Member] | Forluz Deficit Of Pension Plan [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities		(561)
Remote Scenario [Member] | Debt Agreed With Pension Fund [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities		(577)
Remote Scenario [Member] | Loans, Financings and Debentures [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities		(4,823)
At Cost [Member] | Forluz Deficit Of Pension Plan [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities		(55)
At Cost [Member] | Debt Agreed With Pension Fund [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities		(566)
At Cost [Member] | Loans, Financings and Debentures [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities		(473)
Concession Financial Assets Related to Distribution Infrastructure [Member] | Probable Scenario [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	[1]	489
Concession Financial Assets Related to Distribution Infrastructure [Member] | Possible Scenario [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	[1]	491
Concession Financial Assets Related to Distribution Infrastructure [Member] | Remote Scenario [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	[1]	493
Concession Financial Assets Related to Distribution Infrastructure [Member] | At Cost [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	[1]	483
Receivable For Residual Value - Transmission [Member] | Probable Scenario [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		2,500
Receivable For Residual Value - Transmission [Member] | Possible Scenario [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		2,508
Receivable For Residual Value - Transmission [Member] | Remote Scenario [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		2,517
Receivable For Residual Value - Transmission [Member] | At Cost [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		2,468
Concession Grant Fee [Member] | Probable Scenario [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		1,298
Concession Grant Fee [Member] | Possible Scenario [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		1,302
Concession Grant Fee [Member] | Remote Scenario [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		1,306
Concession Grant Fee [Member] | At Cost [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		1,281
Accounts Receivable From Minas Gerais State Government (AFAC) - IGPM Index [Member] | Probable Scenario [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		120
Accounts Receivable From Minas Gerais State Government (AFAC) - IGPM Index [Member] | Possible Scenario [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		121
Accounts Receivable From Minas Gerais State Government (AFAC) - IGPM Index [Member] | Remote Scenario [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		122
Accounts Receivable From Minas Gerais State Government (AFAC) - IGPM Index [Member] | At Cost [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		R$ 115
[1] Portion of the Concession financial assets relating to the Regulatory Remuneration Base of Assets ratified by the regulator (Aneel) after the 4rd tariff review cycle.

X

- Definition

Effect of variation in inflation rates

+ References

No definition available.

+ Details

Name:	cig_EffectOfVariationInInflationRates
Namespace Prefix:	cig_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfAssetsAndLiabilitiesWithSignificantRiskOfMaterialAdjustmentLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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 2019-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 35H
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35H&doctype=Standard
-URIDate 2019-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 35I
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35I&doctype=Standard
-URIDate 2019-03-27

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 35M
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35M&doctype=Standard
-URIDate 2019-03-27

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 35N
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35N&doctype=Standard
-URIDate 2019-03-27

+ 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 2019-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard
-URIDate 2019-03-27

+ Details

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

X

- Definition

The amount of assets less the amount of liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 1
-IssueDate 2019-01-01
-Paragraph IG63
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2019-en-r&anchor=para_IG63&doctype=Implementation%20Guidance
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2019-03-27

+ Details

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

X

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=cig_ProbableScenarioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfInterestRatesAxis=cig_ForluzDeficitOfPensionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfInterestRatesAxis=cig_DebtAgreedWithPensionFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfInterestRatesAxis=cig_LoansFinancingsAndDebenturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=cig_PossibleScenarioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=cig_RemoteScenarioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MeasurementAxis=ifrs-full_AtCostMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=cig_ConcessionFinancialAssetsRelatedToDistributionInfrastructureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=cig_ReceivableForRresidualValueTransmissionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=cig_ConcessionGrantFeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=cig_AccountsReceivableFromMinasGeraisStateGovernmentAFACIGPMIndexMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: