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37. THE ANNUAL TARIFF ADJUSTMENT (Details Narrative) - Cemig Distribution [Member]
May 28, 2019
Disclosure Of Financial Assets And Financial Liabilities With The Tariff Adjustments [line items]  
Percentage of annual tariffs adjustment 8.73%
Percentage of annual tariff adjustment manageable cost 1.60%
Percentage of annual tariffs remaining after adjustment 7.13%
Non-Manageable Costs [Member]  
Disclosure Of Financial Assets And Financial Liabilities With The Tariff Adjustments [line items]  
Percentage of annual tariffs adjustment 0.34%
Other Financial Components [Member]  
Disclosure Of Financial Assets And Financial Liabilities With The Tariff Adjustments [line items]  
Percentage of annual tariffs adjustment 9.24%
Percentage of annual tariffs remaining effect 10.79%
Percentage of annual tariffs remaining withdrawn 2.45%