XML 107 R100.htm IDEA: XBRL DOCUMENT v3.8.0.1

Restricted Cash - Additional Information (Detail) - BRL (R$) R$ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Restricted Cash And Cash Equivalents [Abstract]
Restricted cash	R$ 106	R$ 367

X

- Definition

The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard
-URIDate 2017-03-09

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Disclosure of restricted cash and cash equivalents abstract.

+ References

No definition available.

+ Details

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