XML 197 R179.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Provisions - Additional Information (Details) - BRL (R$) R$ in Thousands | 12 Months Ended | 28 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2006 | Mar. 31, 2022 | Dec. 31, 2021
IfrsStatementLineItems [Line Items] |  |  |  |  |
Tax credit | R$ 148,000 | R$ 164,000 |  |  |
Provision | 1,000 | 1,000 |  |  |
Amount of contingency | 368,000 | 276,000 |  |  |
Estimated probable contingent amount | R$ 24,000 | 23,000 |  |  |
Indemnity of employees, paid |  |  | R$ 178,000 |  |
Social security contribution amount |  |  | R$ 122,000 |  |
Shareholding transaction description | The federal tax authority issued a tax assessment against CEMIG as a jointly responsible party with its jointly controlled entity Parati S.A. Participações em Ativos de Energia Elétrica (Parati), relating to withholding income tax (Imposto de Renda Retido na Fonte, or IRRF) allegedly applicable to returns paid by reason of a capital gain in a shareholding transaction relating to the purchase by Parati, and sale, by Enlighted, at July 7, 2011, of 100.00% of the equity interests in Luce LLC (a company with head office in Delaware, USA), holder of 75.00% of the shares in the Luce Brasil equity investment fund (FIP Luce), which was indirect holder, through Luce Empreendimentos e Participações S.A., of 13.03% of the total and voting shares of Light S.A. (Light). |  |  |  |
Energy billing dispute, refund amount | R$ 234,000 |  |  |  |
Administrative penalty, amount | 26,000 |  |  |  |
Interest on Equity [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Amount of contingency | 74,000 | 67,000 |  |  |
Deposit amount | 82,000 | 68,000 |  |  |
Labor Claims [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Amount of contingency | 1,795,000 | 1,613,000 |  |  |
Estimated probable contingent amount | 432,000 | 415,000 |  |  |
Customers Claims [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Contigent liability amount | 287,000 | 272,000 |  |  |
Estimated probable contingent amount | 45,000 | 41,000 |  |  |
Other Civil Proceedings [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Contigent liability amount | 653,000 | 573,000 |  |  |
Estimated probable contingent amount | 40,000 | 36,000 |  |  |
Regulatory [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Contigent liability amount | 589,000 | 323,000 |  |  |
Estimated probable contingent amount | 26,000 | 25,000 |  |  |
Public Lighting Contribution (CIP) [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Estimate contigent liability amount | 1,582,000 |  |  |  | R$ 1,433,000
Accounting Of Energy Sale Transactions In The Electricity Trading Chamber (CCEE) [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Contigent liability amount | 594,000 | 507,000 |  |  |
Tariff Increases [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Provision | 26,000 | 22,000 |  |  |
Amount of contingency | 66,000 | 53,000 |  |  |
Environmental Claims [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Contigent liability amount | 149,000 | 137,000 |  |  |
Other legal Actions [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Contigent liability amount | 7,000 |  |  |  |
Estimated probable contingent amount | 13,000 | 6,000 |  |  |
Estimate contigent liability amount | 511,000 | 434,000 |  |  |
Deposit amount | 38,000 |  |  |  |
Luz Para Todos' Program [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Estimated probable contingent amount | 154 | 141 |  |  |
Estimate contigent liability amount | 515,000 | 470,000 |  |  |
Contractual Imbalance [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Estimate contigent liability amount | 246,000 | 223,000 |  |  |
IPTU [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Amount of contingency | 186,000 | 94,000 |  |  |
Estimated probable contingent amount | 2,000 | 4,000 |  |  |
Social Security Contributions on Income Sharing Payments [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Amount of contingency | 1,789,000 | 1,640,000 |  |  |
Estimated probable contingent amount | 1,449,000 | 1,311,000 |  |  |
Indemnity of Employees Future Benefit [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Provision | 142,000 | 136,000 |  |  |
Amount of contingency | 319,000 | 305,000 |  |  |
Social Security Contributions [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Amount of contingency | 148,000 | 125,000 |  |  |
Income Tax Withheld on Capital Gain in a Shareholding Transaction [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Amount of contingency | 274,000 | 256,000 |  |  |
CSLL [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Amount of contingency | 587,000 | 517,000 |  |  |
ICMS [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Amount of contingency | 223,000 | 182,000 |  |  |
Infraction notices, amount |  |  |  | R$ 357,000 |
Infraction notices, principal amount |  |  |  | 124,000 |
Infraction notices, penalty payments |  |  |  | 201,000 |
Infraction notices, interest amount |  |  |  | R$ 32,000 |
Pasep and Cofins Taxes [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Amount of contingency | 200,000 | 180,000 |  |  |
Power Supply Outages [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Amount of contingency | 103,000 |  |  |  |
Administrative Penalty [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Amount of contingency | 132,000 | 108,000 |  |  |
Application to Override Corporate Identity [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Estimate contigent liability amount | 127,000 | 103,000 |  |  |
Clearance of Residential Occupation under High Voltage Lines [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Estimate contigent liability amount | 130,000 | R$ 25,000 |  |  |
Volta do Rio Wind Farm [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Estimate contigent liability amount | R$ 174,000 |  |  |  |

X
- Definition Administrative penalty amount. + References No definition available. + Details
Name: | cig_AdministrativePenaltyAmount
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount Of Contingency + References No definition available. + Details
Name: | cig_AmountOfContingency
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount refers to contigent liability amount. + References No definition available. + Details
Name: | cig_ContingentLiability
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Energy billing dispute refund amount. + References No definition available. + Details
Name: | cig_EnergyBillingDisputeRefundAmount
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount refers to estimate contigent liability amount. + References No definition available. + Details
Name: | cig_EstimateContigentLiability
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Ifrs Statement Line Items + References No definition available. + Details
Name: | cig_IfrsStatementLineItems
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Indemnity of employees paid. + References No definition available. + Details
Name: | cig_IndemnityOfEmployeesPaid
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Infraction notices amount. + References No definition available. + Details
Name: | cig_InfractionNoticesAmount
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Infraction notices interest amount. + References No definition available. + Details
Name: | cig_InfractionNoticesInterestAmount
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Infraction notices penalty payments. + References No definition available. + Details
Name: | cig_InfractionNoticesPenaltyPayments
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Infraction notices principal amount. + References No definition available. + Details
Name: | cig_InfractionNoticesPrincipalAmount
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Shareholding transaction description. + References No definition available. + Details
Name: | cig_ShareholdingTransactionDescription
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition social security contribution amount. + References No definition available. + Details
Name: | cig_SocialSecurityContributionAmount
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of current provisions, including provisions for employee benefits. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 54 -Subparagraph l -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_l&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_CurrentProvisions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of current tax relating to particular items that are charged or credited directly to equity, for example: (a) an adjustment to the opening balance of retained earnings resulting from either a change in accounting policy that is applied retrospectively or the correction of an error; and (b) amounts arising on initial recognition of the equity component of a compound financial instrument. [Refer: Retained earnings; Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_a&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_CurrentTaxRelatingToItemsChargedOrCreditedDirectlyToEquity
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of the estimated financial effect of contingent liabilities. [Refer: Contingent liabilities [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2023-01-01 -Paragraph 86 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_86_a&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_EstimatedFinancialEffectOfContingentLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_InterestOnEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_LaborClaimsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_CustomersClaimsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_OtherCivilProceedingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_RegulatoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_PublicLightingContributionCIPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_AccountingOfEnergySaleTransactionsInTheElectricityTradingChamberCCEEMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_TariffIncreasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_EnvironmentalClaimsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_OtherLegalActionsInTheNormalCourseOfBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_LuzParaTodosProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_ContractualImbalanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_IPTUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_SocialSecurityContributionsOnIncomeSharingPaymentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_IndemnityOfEmployeesFutureBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_SocialSecurityContributionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_IncomeTaxWithheldOnCapitalGainInAShareholdingTransactionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_CSLLMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_ICMSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_PasepAndCofinsTaxesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_PowerSupplyOutagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_AdministrativePenaltyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_ApplicationToOverrideCorporateIdentityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_ClearanceOfResidentialOccupationUnderHighVoltageLinesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=cig_VoltaDoRioWindFarmMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |