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Provisions - Additional Information (Details)
R$ in Millions
 12 Months Ended 28 Months Ended
Dec. 31, 2024
BRL (R$)
Dec. 31, 2023
BRL (R$)
Dec. 31, 2022
BRL (R$)
Dec. 31, 2006
BRL (R$)
Mar. 31, 2022
BRL (R$)
Sep. 30, 2024
BRL (R$)
Aug. 31, 2021
Number
IfrsStatementLineItems [Line Items]              
Tax credit R$ 229 R$ 148          
Provision 1            
Amount of contingency 469 368          
Estimated probable contingent amount R$ 6 24          
Indemnity of employees, paid       R$ 178      
Social security contribution amount       R$ 122      
Shareholding transaction description The federal tax authority issued a tax assessment against CEMIG as a jointly responsible party with its jointly controlled entity Parati S.A. Participações em Ativos de Energia Elétrica (Parati), relating to withholding income tax (Imposto de Renda Retido na Fonte, or IRRF) allegedly applicable to returns paid by reason of a capital gain in a shareholding transaction relating to the purchase by Parati, and sale, by Enlighted, at July 7, 2011, of 100.00% of the equity interests in Luce LLC (a company with head office in Delaware, USA), holder of 75.00% of the shares in the Luce Brasil equity investment fund (FIP Luce), which was indirect holder, through Luce Empreendimentos e Participações S.A., of 13.03% of the total and voting shares of Light S.A. (Light).            
Energy billing dispute, refund amount R$ 275 234          
Administrative penalty, amount 26            
Additions 508 409 R$ 583        
Financial assets 8,072 6,540          
Reversals 598 49 241        
PIS/PasepTaxes and Cofins [member]              
IfrsStatementLineItems [Line Items]              
Number Of Infringment Notices | Number             2
Provision for taxes other than income tax [member]              
IfrsStatementLineItems [Line Items]              
Additions 45 147 332        
Reversals 576 2 R$ 150        
Interest on Equity [Member]              
IfrsStatementLineItems [Line Items]              
Amount of contingency 80 74          
Deposit amount 88 82          
Labor Claims [Member]              
IfrsStatementLineItems [Line Items]              
Amount of contingency 1,509 1,795          
Estimated probable contingent amount 467 432          
Customers Claims [member]              
IfrsStatementLineItems [Line Items]              
Contigent liability amount 492 287          
Estimated probable contingent amount 94 45          
Other Civil Proceedings [member]              
IfrsStatementLineItems [Line Items]              
Contigent liability amount 698 653          
Estimated probable contingent amount 62 40          
Regulatory [Member]              
IfrsStatementLineItems [Line Items]              
Contigent liability amount 637 589          
Estimated probable contingent amount 29 26          
Public Lighting Contribution (CIP) [member]              
IfrsStatementLineItems [Line Items]              
Estimate contigent liability amount 1,672 1,582          
Accounting Of Energy Sale Transactions In The Electricity Trading Chamber (CCEE) [member]              
IfrsStatementLineItems [Line Items]              
Contigent liability amount 681 594          
Tariff Increases [member]              
IfrsStatementLineItems [Line Items]              
Provision 27 26          
Amount of contingency 67 66          
Environmental Claims [member]              
IfrsStatementLineItems [Line Items]              
Contigent liability amount 159 149          
Other legal Actions [member]              
IfrsStatementLineItems [Line Items]              
Estimated probable contingent amount 22 13          
Estimate contigent liability amount 792 511          
Luz Para Todos' Program [member]              
IfrsStatementLineItems [Line Items]              
Estimate contigent liability amount 344 515          
Contractual Imbalance [Member]              
IfrsStatementLineItems [Line Items]              
Estimate contigent liability amount 200 246          
IPTU [Member]              
IfrsStatementLineItems [Line Items]              
Amount of contingency 190 186          
Estimated probable contingent amount 3 2          
Social Security Contributions on Income Sharing Payments [Member]              
IfrsStatementLineItems [Line Items]              
Amount of contingency 1,889 1,803          
Estimated probable contingent amount 926 1,449          
Reversals 584            
Real Estate Transmission Tax [Member]              
IfrsStatementLineItems [Line Items]              
Amount of contingency 51            
Indemnity of Employees Future Benefit [Member]              
IfrsStatementLineItems [Line Items]              
Provision 148 142          
Amount of contingency 332 319          
Social Security Contributions [Member]              
IfrsStatementLineItems [Line Items]              
Amount of contingency 159 148          
Income Tax Withheld on Capital Gain in a Shareholding Transaction [Member]              
IfrsStatementLineItems [Line Items]              
Amount of contingency 289 274          
CSLL [Member]              
IfrsStatementLineItems [Line Items]              
Provision 508            
Amount of contingency   587          
ICMS [Member]              
IfrsStatementLineItems [Line Items]              
Amount of contingency 261 223          
Infraction notices, amount         R$ 357    
Infraction notices, principal amount         124    
Infraction notices, penalty payments         201    
Infraction notices, interest amount         R$ 32    
Pasep and Cofins Taxes [Member]              
IfrsStatementLineItems [Line Items]              
Amount of contingency 216 200          
Power Supply Outages [Member]              
IfrsStatementLineItems [Line Items]              
Contigent liability amount 345 103          
Administrative Penalty [Member]              
IfrsStatementLineItems [Line Items]              
Amount of contingency 156 132          
Arbitration Proceedings [Member]              
IfrsStatementLineItems [Line Items]              
Contigent liability amount 163            
Application to Override Corporate Identity [Member]              
IfrsStatementLineItems [Line Items]              
Estimate contigent liability amount 146 146          
Clearance of Residential Occupation under High Voltage Lines [Member]              
IfrsStatementLineItems [Line Items]              
Estimate contigent liability amount 223 130          
Additions 12            
Volta do Rio Wind Farm [Member]              
IfrsStatementLineItems [Line Items]              
Estimate contigent liability amount 311 174          
Accounts Receivable From The State Of Minas Gerais [Member]              
IfrsStatementLineItems [Line Items]              
Contigent liability amount           R$ 278  
Financial assets 13 R$ 13          
Power Purchasing Agreement [Member]              
IfrsStatementLineItems [Line Items]              
Estimated probable contingent amount R$ 57