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Assets And Liabilities Classified As Held For Sale; Profit (Loss) From Discontinued Operations - Summary of Changes in Assets and Liabilities Classified as Held for Sale (Detail) R$ in Millions	12 Months Ended
	Dec. 31, 2018 BRL (R$)
Disclosure of assets and liabilities classified as held for sale [abstract]
Reclassification of investments - Note 17	R$ 1,786
Changes in assets and liabilities classified as held for sale	32
Assets and liabilities held for sale	R$ 1,818

X

- Definition

Adjustments for increase (decrease) in assets and liabilities held for sale.

+ References

No definition available.

+ Details

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X

- Definition

Assets and liabilities held for sale.

+ References

No definition available.

+ Details

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Namespace Prefix:	xcmig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Disclosure of assets and liabilities classified as held for sale.

+ References

No definition available.

+ Details

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X

- Definition

Reclassification of equity method investment to held for sale.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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