XML 143 R136.htm IDEA: XBRL DOCUMENT v3.19.1

Investments - Summary of Changes in Dividends Receivable (Detail) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Dividends [abstract]
Initial balance	R$ 77	R$ 11
Investees' dividends proposed	354	420
Amounts received	(311)	(354)
Final balance	R$ 120	R$ 77

X

- Definition

The amount of dividends received.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2018-01-01
-Paragraph B12
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B12_a&doctype=Appendix&seq=2
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_DividendsReceived
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Disclosure of dividends.

+ References

No definition available.

+ Details

Name:	xcmig_DisclosureOfDividendsAbstract
Namespace Prefix:	xcmig_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Dividend receivable.

+ References

No definition available.

+ Details

Name:	xcmig_DividendReceivable
Namespace Prefix:	xcmig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Investees dividends proposal.

+ References

No definition available.

+ Details

Name:	xcmig_InvesteesDividendsProposal
Namespace Prefix:	xcmig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration