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Investments - Schedule of Percentage of Company's Equity Interest (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Total investments R$ 3,221 R$ 4,632
C E M I G Geracaoe Transmissao [Member]    
IfrsStatementLineItems [Line Items]    
Control Controlled  
Total investments
Guanhaes Energia [Member]    
IfrsStatementLineItems [Line Items]    
Control [1] Jointly controlled  
Total investments R$ 172 222
Hidreletrica cachoeirao [member]    
IfrsStatementLineItems [Line Items]    
Control Jointly controlled  
Total investments R$ 45 47
Hidreletrica pipoca [member]    
IfrsStatementLineItems [Line Items]    
Control Jointly controlled  
Total investments R$ 54 47
Alianca norte (belo monte plant) [member]    
IfrsStatementLineItems [Line Items]    
Control [2] Jointly controlled  
Total investments R$ 419 536
Alianca Geracao [Member]    
IfrsStatementLineItems [Line Items]    
Control [3] Jointly controlled  
Total investments 1,172
Amazonia Energia [Member]    
IfrsStatementLineItems [Line Items]    
Control Jointly controlled  
Total investments R$ 697 819
Paracambi Energetica [Member]    
IfrsStatementLineItems [Line Items]    
Control Jointly controlled  
Total investments R$ 105 112
Taesa [Member]    
IfrsStatementLineItems [Line Items]    
Control Jointly controlled  
Total investments R$ 1,615 1,565
C E M I G Sim [Member]    
IfrsStatementLineItems [Line Items]    
Control Controlled  
U F V S [Member]    
IfrsStatementLineItems [Line Items]    
Control [4] Jointly controlled  
Total investments R$ 114 R$ 112
[1]

On September 19, 2023, the Extraordinary General Meeting of Guanhães Energia approved the reduction of share capital in the amount of R$235, of which R$137 was destined for absorbing losses and R$98 for restitution to shareholders. Cemig GT's share corresponds to R$48 was received in 2024.
[2]

Indirect interest in the Belo Monte plant through these investees.
[3]

On August 13, 2024, the process of sale of the interest to Vale S.A. was completed. For more information, please see Note 31.
[4] Set of photovoltaics business, in which the investee Cemig Sim has an interest.