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Operating Segments - Schedule of Operating Revenues, Costs and Expenses (Parenthetical) (Detail) R$ in Millions | 12 Months Ended
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Dec. 31, 2015 BRL (R$)
Disclosure of operating segments [abstract] |
Operating provision expense | R$ 1,084

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | na
Period Type: | duration

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- Definition Operating provision expense. + References No definition available. + Details
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Namespace Prefix: | xcmig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration