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Investments - Schedule of Measurements of Fair Value of Assets and Liabilities (Details) - BRL (R$)
R$ in Millions
12 Months Ended
Apr. 28, 2023
Dec. 31, 2022
Dec. 31, 2021
Jul. 20, 2023
IfrsStatementLineItems [Line Items]        
Bargain purchase   R$ 5 R$ 4  
Goodwill       R$ 6
C E M I G Sim [Member]        
IfrsStatementLineItems [Line Items]        
Net equity of the Montes Claros solar plant R$ 20      
Added value (fair value - book value) 1      
Fair value of net assets acquired 21      
Goodwill 1      
Consideration paid R$ 20