XML 108 R90.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Receivables From Customers - Schedule of Provision for Allowance for Doubtful Accounts (Details) - BRL (R$) R$ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
IfrsStatementLineItems [Line Items] |  |
Allowance account for credit losses of financial assets | R$ 867 | R$ 820
Residential [member] |  |
IfrsStatementLineItems [Line Items] |  |
Allowance account for credit losses of financial assets | 322 | 272
Industrial [member] |  |
IfrsStatementLineItems [Line Items] |  |
Allowance account for credit losses of financial assets | 173 | 168
Commercial, services and others [member] |  |
IfrsStatementLineItems [Line Items] |  |
Allowance account for credit losses of financial assets | 237 | 203
Rural [member] |  |
IfrsStatementLineItems [Line Items] |  |
Allowance account for credit losses of financial assets | 40 | 33
Public authorities [member] |  |
IfrsStatementLineItems [Line Items] |  |
Allowance account for credit losses of financial assets | 27 | 28
Public lighting [member] |  |
IfrsStatementLineItems [Line Items] |  |
Allowance account for credit losses of financial assets | 2 | 1
Public services [member] |  |
IfrsStatementLineItems [Line Items] |  |
Allowance account for credit losses of financial assets | 27 | 33
Network Fees [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Allowance account for credit losses of financial assets | R$ 39 | R$ 82

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 The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expired 2023-01-01 -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2023-03-23 + Details
Name: | ifrs-full_AllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_ResidentialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_IndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_CommercialServicesAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_RuralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_PublicAuthoritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_PublicLightingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_PublicServiceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cig_NetworkFeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |