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Loans, financing, debentures and derivative financial instruments - Narrative of Debentures (Detail) - BRL (R$)
R$ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2023
Mar. 31, 2023
Oct. 31, 2022
Apr. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Summary of loans debentures and finance leases [line items]              
Amount of guarantees and promissory notes R$ 10,966,890       R$ 10,966,890 R$ 9,371,295  
Collateral guarantees to secure letters of credits 103,600       103,600 115,451  
Amount of contract settled         3,149,525 5,848,611 R$ 2,426,222
IPP [member]              
Summary of loans debentures and finance leases [line items]              
Maximum amount of future payments related to these collaterals 397,152       R$ 397,152 R$ 550,908  
Debentures fifth issue [member] | IPP [member]              
Summary of loans debentures and finance leases [line items]              
Amount of contract settled       R$ 660,139      
Debentures sixth issue [member] | IPP [member]              
Summary of loans debentures and finance leases [line items]              
Amount of contract settled   R$ 1,725,000          
Debentures seventh issue [member] | IPP [member]              
Summary of loans debentures and finance leases [line items]              
Amount of contract settled     R$ 730,384        
Debentures eighth issue [member] | IPP [member]              
Summary of loans debentures and finance leases [line items]              
Amount of contract settled R$ 660,000