XML 96 R82.htm IDEA: XBRL DOCUMENT
v3.23.2

MARKETABLE SECURITIES (Details) - BRL (R$) R$ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
IfrsStatementLineItems [Line Items] |  |  |
Current investments |  | R$ 1,745 | R$ 1,724
Non-current investments |  | 134 | 354
Investments |  | 1,879 | 2,078
Bank deposit certificates (CDBs) [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Current investments | [1] | 191 | 101
Non-current investments | [1] | 127 |
Financial Notes Banks [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Current investments | [2] | 1,140 | 1,417
Non-current investments | [2] |  | 348
Marketable securities - treasury financial notes [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Current investments | [3] | 402 | 178
Other Investment [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Current investments |  | 12 | 28
Non-current investments |  |  | 1
Debentures [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Non-current investments | [4] | R$ 7 | R$ 5
[1] | Bank Certificates of Deposit (Certificados de Depósito Bancário, or CBDs), accrued interest varying between 103% to 104.4% of the CDI Rate (Interbank Rate for Interbank Certificates of Deposit or Certificados de Depósito Inter-bancário - CDIs) published by the Custody and Settlement Chamber (Câmara de Custódia e Liquidação, or Cetip) on December 31, 2022 (107.24% on December 31, 2021).
[2] | Bank Financial Notes (Letras Financeiras, or LFs) are fixed-rate fixed-income securities, issued by banks and that accrued interest a percentage of the CDI rate published by Cetip. The LFs had remuneration rates varying between 103.3% and 110.26% of the CDI rate on December 31, 2022 (105% and 130% on December 31, 2021).
[3] | Treasury Financial Notes (LFTs) are fixed-rate securities, their yield follows the daily changes in the Selic rate between the date of purchase and the date of maturity. The LFTs had remuneration rates varying between 13.65% and 13.88% in 2022 (9.12% and 9.50% in 2021).
[4] | Debentures

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

X
- Definition Long term securities. + References No definition available. + Details
Name: | cig_LongTermSecurities
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Short term and long term securities. + References No definition available. + Details
Name: | cig_ShortTermAndLongTermSecurities
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | cig_ShortTermSecurities
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | cig_InvestmentTypesAxis=cig_BankCertificateOfDepositCDBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cig_InvestmentTypesAxis=cig_FinancialNotesBanksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cig_InvestmentTypesAxis=cig_TreasuryFinancialNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cig_InvestmentTypesAxis=cig_OtherInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cig_InvestmentTypesAxis=cig_DebenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |