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Finance Income and Expenses - Schedule of Finance Income and Expenses (Parenthetical) (Details) R$ in Millions | 12 Months Ended
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Dec. 31, 2023 BRL (R$)
Finance Income And Expenses |
Proceeds from escrow deposits | R$ 14

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- Definition Finance Income And Expenses Abstract + References No definition available. + Details
Name: | cig_FinanceIncomeAndExpensesAbstract
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Proceeds from escrow deposits. + References No definition available. + Details
Name: | cig_ProceedsFromEscrowDeposits
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration