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10. PIS/PASEP AND COFINS TAXES CREDITS OVER ICMS - FINAL COURT JUDGMENT (Details Narrative) - BRL (R$)
R$ in Millions
 12 Months Ended
Jun. 11, 2019
Jul. 16, 2008
Dec. 31, 2019
Dec. 31, 2018
Pispasep And Cofins Taxes Credits Over Icms - Final Court Judgment        
Term of offsetting of amounts unduly paid   10 years    
Description of judgment Judgment against which there is no further appeal, the subsidiaries Cemig D and Cemig GT applied for release of the escrow deposits amounting R$1.377 as of December 31, 2019. On February 13, 2020, the escrow deposits were released amounting R$1,382, including monetary update. Of this amount, R$1,155 will be restituted to customers of the distribution segment, after Aneel specifies the mechanisms and criteria for reimbursement.      
Descritption of maximum period for calculation of the reimbursement the Company believes that a portion of the credits to be received by Cemig D should be reimbursed to its customers, considering a maximum period for calculation of the reimbursement of 10 years. Thus, Cemig D has constituted a liability corresponding to the credits to be reimbursed to its customers, which comprises the period of the last 10 years, from June 2009 to May 2019, net of PIS/Pasep and Cofins taxes over monetary updating      
Pasep and Cofins taxes to be reimbursed to customers     R$ 4,193 R$ 1,124
Difference amount of pasep and Cofins taxes to be reimbursed to customers     1,155  
Credits recognized in operating profit     3,826  
Amounts to be reimbursed to customers     2,398  
Net of PIS/Pasep and Cofins taxes on finance income     R$ 25  
Average reduction in the invoice amount     1.00%