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Taxes Payable and Amounts to be Refunded to Customers - Additional Information (Details) - BRL (R$)
R$ in Millions
 1 Months Ended 12 Months Ended
May 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Taxes payable and amounts to be refunded to customers [Line items]      
Reversal of amounts to be refunded to consumers R$ 411 R$ (411)  
Cemig D [Member]      
Taxes payable and amounts to be refunded to customers [Line items]      
Amount refunded to consumers regarding credits   209 R$ 1,014
Gasmig [Member]      
Taxes payable and amounts to be refunded to customers [Line items]      
Amount refunded to consumers regarding credits   R$ 143 R$ 163