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Taxes Payable and Amounts to be Refunded to Customers - Additional Information (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Taxes payable and amounts to be refunded to customers [Line items]    
Amount refunded R$ 5,852 R$ 3,225
Tax credit reduced amount 67  
Tax credit amount corresponds to original credit 23  
Cemig D [Member]    
Taxes payable and amounts to be refunded to customers [Line items]    
Amount refunded to consumers regarding credits 1,014 2,787
Gasmig [Member]    
Taxes payable and amounts to be refunded to customers [Line items]    
Amount refunded to consumers regarding credits R$ 163 R$ 176