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Investments - Schedule of Conclusion of the Transaction Cost Recognized the Following Accounting Effects (Details) - BRL (R$)
R$ in Millions
 1 Months Ended
Nov. 30, 2023
Oct. 31, 2023
Sep. 30, 2023
Apr. 30, 2023
Disclosure of detailed information about borrowings [line items]        
Value of asset held for sale on Sep. 30, 2023       R$ (350)
Baguari Energia [Member]        
Disclosure of detailed information about borrowings [line items]        
Total sale price   R$ 421    
Value of asset held for sale on Sep. 30, 2023     R$ (160) (160)
Corporate capital gain (1) (a) [1]   261    
Tax capital gain net of selling expenses [2]   248    
Corporate income tax and the social contribution on net income IRPJ and CSLL (b)   (84)    
Tax capital gain net of taxes [1]   164    
Net impact on the Income Statement (a + b)   R$ 177    
Retiro Baixo [Member]        
Disclosure of detailed information about borrowings [line items]        
Total sale price R$ 218      
Value of asset held for sale on Sep. 30, 2023 (191)     R$ (190)
Corporate capital gain (1) (a) 27      
Tax capital gain net of selling expenses 6      
Corporate income tax and the social contribution on net income IRPJ and CSLL (b) (2)      
Tax capital gain net of taxes 4      
Net impact on the Income Statement (a + b) R$ 25      
Cemig Geracaoe Transmissao S A [Member] | Baguari Energia [Member]        
Disclosure of detailed information about borrowings [line items]        
Stake held by Cemig GT   69.39%    
Cemig Geracaoe Transmissao S A [Member] | Retiro Baixo [Member]        
Disclosure of detailed information about borrowings [line items]        
Stake held by Cemig GT 49.90%      
[1] The effects of the disposal will be reported in the net profit for the operational segment of Equity holdings, in the note 5.
[2] Sales expenses totaled R$1 and its refers to accounting, tax and legal due diligence services, and legal advice.