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Revenue - Additional Information (Details)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
BRL (R$)
Feb. 29, 2024
BRL (R$)
Dec. 31, 2023
BRL (R$)
IfrsStatementLineItems [Line Items]      
Average percentage of implicit rate 6.86%    
Current subsidy receivable R$ 208 R$ 101 R$ 196
Subsidies revenue recognized R$ 1,958   R$ 1,565
Number Of Hydroelectric Plants 18    
Utilization of the contracted capacity percentage 85.00%    
Cemig D [Member]      
IfrsStatementLineItems [Line Items]      
Current subsidy receivable R$ 197    
Ceming G T [Member]      
IfrsStatementLineItems [Line Items]      
Current subsidy receivable R$ 11