v3.26.1
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of changes in fair value [line items]      
Gains (losses) recognized in result R$ 986,521 R$ 317,729 R$ (238,458)
Not designated as hedging instrument      
Disclosure of changes in fair value [line items]      
Rights (obligations) with derivatives, beginning balance (117,115) (536,611)  
Gains (losses) recognized in result 986,521 317,729  
Payment (receipts) 46,822 101,767  
Transfers 38,576    
Restructuring (961,252)    
Non-current convertible instruments (6,448)    
Rights (obligations) with derivatives, ending balance (6,448) (117,115) (536,611)
Not designated as hedging instrument | Forward – fuel      
Disclosure of changes in fair value [line items]      
Rights (obligations) with derivatives, beginning balance (65,375) (60,102)  
Gains (losses) recognized in result (20,023) (108,435)  
Payment (receipts) 46,822 103,162  
Transfers 38,576    
Restructuring 0    
Non-current convertible instruments 0    
Rights (obligations) with derivatives, ending balance 0 (65,375) (60,102)
Not designated as hedging instrument | Option fuel      
Disclosure of changes in fair value [line items]      
Rights (obligations) with derivatives, beginning balance 0 12,266  
Gains (losses) recognized in result 0 (10,871)  
Payment (receipts) 0 (1,395)  
Transfers 0    
Restructuring 0    
Non-current convertible instruments 0    
Rights (obligations) with derivatives, ending balance 0 0 12,266
Not designated as hedging instrument | Conversion right debentures      
Disclosure of changes in fair value [line items]      
Rights (obligations) with derivatives, beginning balance (51,740) (488,775)  
Gains (losses) recognized in result 1,006,544 437,035  
Payment (receipts) 0 0  
Transfers 0    
Restructuring (961,252)    
Non-current convertible instruments (6,448)    
Rights (obligations) with derivatives, ending balance (6,448) R$ (51,740) R$ (488,775)
Not designated as hedging instrument | Conversion into shares      
Disclosure of changes in fair value [line items]      
Rights (obligations) with derivatives, ending balance R$ 311,299,938