XML 206 R191.htm IDEA: XBRL DOCUMENT
v3.23.1

FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details 1) - Put option - SAAG [member] - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
IfrsStatementLineItems [Line Items] |  |  |
Balance | R$ 636 | R$ 536 | R$ 483
Adjustment to fair value | 36 | 100 | 53
Balance | R$ 672 | R$ 636 | R$ 536

X
- Definition Adjustment to fair value of options. + References No definition available. + Details
Name: | cig_AdjustmentToFairValueOfOptions
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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 financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_DerivativeFinancialLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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