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Sale Of Assets - Additional Information (Details)
R$ in Millions
12 Months Ended
Aug. 13, 2024
BRL (R$)
Mar. 17, 2023
Number
Dec. 31, 2024
BRL (R$)
Number
Dec. 31, 2023
BRL (R$)
Dec. 31, 2022
BRL (R$)
Mar. 27, 2024
Feb. 29, 2024
BRL (R$)
IfrsStatementLineItems [Line Items]              
Dividends received     R$ 349 R$ 592 R$ 708    
Current subsidy receivable     R$ 208 R$ 196     R$ 101
Number of hydroelectric generation plants and units | Number   15 15        
Alianca Energia SA [Member]              
IfrsStatementLineItems [Line Items]              
Percentage of share acquired           45.00%  
Cemiggt [Member]              
IfrsStatementLineItems [Line Items]              
Number of hydroelectric generation plants and units | Number   12          
Cemiggt [Member] | Alianca Energia SA [Member]              
IfrsStatementLineItems [Line Items]              
Total Considerations     R$ 2,737        
Horizontes [Member]              
IfrsStatementLineItems [Line Items]              
Number of hydroelectric generation plants and units | Number   3          
Alianca Geracao [Member] | Cemiggt [Member]              
IfrsStatementLineItems [Line Items]              
Total Considerations R$ 2,737            
Other cash payments to acquire equity or debt instruments of other entities, classified as investing activities 2,700            
Dividends received R$ 299            
Amount of compensation     R$ 223        
Percentage of future compensation     45.00%        
Expenses incurred for sale of asset     R$ 2