XML 178 R157.htm IDEA: XBRL DOCUMENT
v3.21.1

22. LOANS, FINANCING AND DEBENTURES (Detaills 2) - BRL (R$) R$ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | R$ 2,310 | R$ 14,777
Promissory Notes and Sureties [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 10,197 |
Guarantee and Receivables [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 3,454 |
Receivables [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 112 |
Shares [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 330 |
Unsecured [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | R$ 927 |

X
- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_Borrowings
Namespace Prefix: | ifrs-full_
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_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_TypesOfFinancialLiabilitiesAxis=cig_PromissoryNotesAndSuretiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfFinancialLiabilitiesAxis=cig_GuaranteeAndReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfFinancialLiabilitiesAxis=cig_ReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfFinancialLiabilitiesAxis=cig_SharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfFinancialLiabilitiesAxis=cig_UnsecuredMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |