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Financial Instruments - Sensitivity analysis level 2 hierarchy (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Financial assets, fair value R$ 14,141,119 R$ 13,947,322
Financial liabilities, fair value 19,184,180 R$ 17,995,389
Energy trading futures contracts [member] | Discounted cash flow method [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, fair value R$ 404,695  
Financial liabilities, sensitivity of inputs to fair value increase [1] 10.00%  
Financial assets, sensitivity of inputs to fair value percentage increase [1] 10.00%  
Financial assets, sensitivity of inputs to fair value increase [1] R$ 382,794  
Financial assets, sensitivity of inputs to fair value decrease [1] 404,581  
Energy trading futures contracts [member] | Discounted cash flow method [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, fair value R$ 114,776  
Financial liabilities, sensitivity of inputs to fair value decrease [1] 10.00%  
Financial assets, sensitivity of inputs to fair value percentage decrease [1] 10.00%  
Financial assets, sensitivity of inputs to fair value increase [1] R$ 115,361  
Financial assets, sensitivity of inputs to fair value decrease [1] R$ 125,715  
[1] This 10% variation scenario represents a fluctuation considered reasonable by the Company, based on the history of negotiations concluded under similar market conditions.