XML 249 R228.htm IDEA: XBRL DOCUMENT
v3.21.1

33. INSURANCE (Details Narrative) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 BRL (R$)
Cemig distribuicao [member] |  |
Disclosure of types of insurance contracts [line items] |  |
Maximum indemnity limit | R$ 231 |
Cemig distribuicao [member] | Operational risk [member] |  |
Disclosure of types of insurance contracts [line items] |  |
Expense arising from other energy distribution equipment | 1,000 | [1]
Cemig Geracao E Transmissao [member] | Operational risk [member] |  |
Disclosure of types of insurance contracts [line items] |  |
Expense arising from other energy distribution equipment | R$ 1,000 |
[1] | Maximum indemnity limit: R$231.

X
- Definition Maximum indemnity limit of insurance contract. + References No definition available. + Details
Name: | cig_MaximumIndemnityLimitOfInsuranceContract
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_DisclosureOfTypesOfInsuranceContractsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of expense arising from insurance contracts. [Refer: Types of insurance contracts [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2020-01-01 -Paragraph 37 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2020-en-b&anchor=para_37_b&doctype=Standard&book=b -URIDate 2020-01-01 + Details
Name: | ifrs-full_ExpenseArisingFromInsuranceContracts
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigDistribuicaoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInsuranceContractsAxis=cig_OperationalRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigGeracaoETransmissaoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |