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Finance Income and Expenses - Schedule of Finance Income and Expenses (Parenthetical) (Details) R$ in Millions	12 Months Ended
	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

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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