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Cover
 12 Months Ended
Dec. 31, 2019
shares
Cover [Abstract]  
Entity Registrant Name ENERGY CO OF MINAS GERAIS
Entity Central Index Key 0001157557
Document Type 20-F
Document Period End Date Dec. 31, 2019
Amendment Flag false
Current Fiscal Year End Date --12-31
Entity Incorporation, State or Country Code D5
Entity a Well-known Seasoned Issuer Yes
Entity a Voluntary Filer No
Entity Reporting Status Current Yes
Entity Interactive Data Current Yes
Document Shell Company Report false
Document Annual Report true
Document Transition Report false
Entity Filer Category Large Accelerated Filer
Document Accounting Standard International Financial Reporting Standards
Entity Emerging Growth Company false
Entity Shell Company false
Entity Common Stock, Shares Outstanding 487,614,213
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2019