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The Annual Tariff Adjustment- Additional Information (Detail) - Cemig Distribution [member] | May 23, 2017
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Disclosure Of Financial Assets And Financial Liabilities With The Tariff Adjustments [Line Items] |
Percentage of decrease in annual tariffs | 10.66%
Cost items adjustment [member] |
Disclosure Of Financial Assets And Financial Liabilities With The Tariff Adjustments [Line Items] |
Percentage of annual tariffs adjustment | 1.29%
Inclusion of financial components adjustment [member] |
Disclosure Of Financial Assets And Financial Liabilities With The Tariff Adjustments [Line Items] |
Percentage of annual tariffs adjustment | 4.68%
Removal of financial components adjustment [member] |
Disclosure Of Financial Assets And Financial Liabilities With The Tariff Adjustments [Line Items] |
Percentage of annual tariffs adjustment | 7.28%

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