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Loans and Debentures - Additional Information (Details)
shares in Thousands, $ in Millions
 1 Months Ended 12 Months Ended
Dec. 27, 2024
BRL (R$)
shares
Dec. 05, 2024
BRL (R$)
Dec. 05, 2024
USD ($)
Sep. 27, 2024
BRL (R$)
Number
shares
Jul. 31, 2018
USD ($)
Number
Dec. 31, 2017
USD ($)
Number
Dec. 31, 2024
BRL (R$)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
BRL (R$)
IfrsStatementLineItems [Line Items]                  
Principal amount R$ 200,000,000     R$ 2,436,000,000          
Average foreign currencies exchange rate             7.92    
Debenture R$ 200,000,000                
Debenture rate 0.47%                
Maturity term 5 years                
Threshold amount of early maturity clauses for cross default             R$ 50,000,000    
Debt average repayment period             2 years 9 months 18 days 2 years 9 months 18 days  
Nominal Cost Of Entitys Debt             12.64% 12.64% 11.98%
Real Cost Of Entitys Debt             7.66% 7.66% 6.65%
Restricted Cash and Cash Equivalents             R$ 235,000,000   R$ 31,000,000
Cemig D [Member]                  
IfrsStatementLineItems [Line Items]                  
Fiduciary guarantee             185,000,000    
Eurobonds [member]                  
IfrsStatementLineItems [Line Items]                  
Number Of Monthly Payments Of Interest | Number         6 6      
Debentures - 7th Issue - Single series [Member] | Cemig D [Member]                  
IfrsStatementLineItems [Line Items]                  
Fiduciary guarantee             R$ 181,000,000    
Debentures - 9th Issue - Single series [Member]                  
IfrsStatementLineItems [Line Items]                  
Principal amount R$ 200,000,000                
Debentures shares issued | shares 200                
Debentures - 9th Issue - Single series [Member] | Gasmig [Member]                  
IfrsStatementLineItems [Line Items]                  
Nominal Unit Value 1,000                
11th Debentures Issuance CEMIG D [Member]                  
IfrsStatementLineItems [Line Items]                  
Principal amount       R$ 2,500,000,000          
Debentures shares issued | shares       2,500          
11th Debentures Issuance CEMIG D [Member] | Cemig D [Member]                  
IfrsStatementLineItems [Line Items]                  
Number Of Series Of Unsecured Non Convertible Debentures Issue | Number       2          
Cemiggt [Member] | Eurobonds [member]                  
IfrsStatementLineItems [Line Items]                  
Principal amount | $         $ 500 $ 1,000      
Repayments of borrowings, classified as financing activities   R$ 2,309,000,000 $ 381         $ 1,119  
Average foreign currencies exchange rate   6.0585 6.0585            
Gain (loss) on hedge ineffectiveness   R$ 443,000,000              
Net effect on cash position   R$ 1,866,000,000