XML 148 R112.htm IDEA: XBRL DOCUMENT
v3.22.1

Schedule of percentage of the company’s equity interest (Details) - BRL (R$) R$ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
IfrsStatementLineItems [Line Items] |  |
Total investments | R$ 4,923 | R$ 5,385
Hidreletrica cachoeirao [member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 59 | 53
Guanhaes Energia [member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 125 | 131
Hidreletrica Pipoca [member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 47 | 36
Retiro baixo [member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 201 | 195
Alianca norte [member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 609 | 631
Amazonia Energia [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Total investments | R$ 933 | 965
Madeira energia [member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Affiliated |
Total investments |  | 209
Fip melbourne [member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Affiliated |
Total investments |  | 158
Lightger [member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 124 | 131
Baguari Energia [member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 168 | 159
Alianca geracao [member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 1,141 | 1,167
Taesa [member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 1,580 | 1,467
Ativas data center [member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Affiliated |
Total investments | R$ 16 | 17
UFV Janauba Geracao de Energia Eletrica Distribuida [member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 3 | 10
U F V Manga Geracao De Energia Eletrica Distribuidat [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 11 | 11
U F V Corinto Geracao De Energia Eletrica S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 9 | 10
U F V Bonfinopolis Geracao De Energia Eletrica Distribuida [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 6 | 6
U F V Lagoa Grande Geracao De Energia Eletrica Distribuida [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 15 | 15
U F V Lontra Geracao De Energia Eletrica Distribuida [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 18 | 17
U F V Mato Verde Geracao De Energia Eletrica Distribuida [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 6 | 6
U F V Mirabela Geracao De Energia Eletrica Distribuida [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 4 | 4
U F V Porteirinha I Geracao De Energia Eletrica Distribuida [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 5 | 6
U F V Porteirinha I I Geracao De Energia Eletrica Distribuida [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 7 | 7
U F V Porteirinha I I Geracao De Energia Eletrica Distribuida 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 15 |
Axxiom Solucoes Tecnologicas [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ 4 | 4
Investments Property [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Total investments | R$ 5,106 | 5,415
Itaocara Provision For Losses [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Jointly controlled |
Total investments | R$ (21) | R$ (30)
Madeira Energia 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Control | Affiliated |
Total investments | R$ (162) |

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

X
- Definition Investments in associates accounted for using equity method gross + References No definition available. + Details
Name: | cig_InvestmentsInAssociatesAccountedForUsingEquityMethodGross
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The description of how the acquirer obtained the power to govern the financial and operating policies of the acquiree so as to obtain benefits from its activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B64 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_d&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
Name: | ifrs-full_DescriptionOfHowAcquirerObtainedControlOfAcquiree
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_HidreletricaCachoeiraoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_GuanhaesEnergiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_HidreletricaPipocaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_RetiroBaixoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_AliancaNorteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_AmazoniaEnergiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_MadeiraEnergiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_FipMelbourneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_LightgerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_BaguariEnergiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_AliancaGeracaoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_TaesaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_AtivasDataCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_UFVJanaubaGeracaoDeEnergiaEletricaDistribuidaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_UFVMangaGeracaoDeEnergiaEletricaDistribuidatMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_UFVCorintoGeracaoDeEnergiaEletricaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_UFVBonfinopolisGeracaoDeEnergiaEletricaDistribuidaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_UFVLagoaGrandeGeracaoDeEnergiaEletricaDistribuidaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_UFVLontraGeracaoDeEnergiaEletricaDistribuidaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_UFVMatoVerdeGeracaoDeEnergiaEletricaDistribuidaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_UFVMirabelaGeracaoDeEnergiaEletricaDistribuidaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_UFVPorteirinhaIGeracaoDeEnergiaEletricaDistribuidaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_UFVPorteirinhaIIGeracaoDeEnergiaEletricaDistribuidaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_UFVPorteirinhaIIGeracaoDeEnergiaEletricaDistribuida1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_AxxiomSolucoesTecnologicasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_InvestmentsPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_ItaocaraProvisionForLossesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_MadeiraEnergia1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |