v3.26.1
INCOME TAX AND SOCIAL CONTRIBUTION - Additional Information (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
TAXES PAYABLE    
Deferred tax assets R$ 3,355,170  
Unrecognized / reversed deferred taxes 10,337,192  
Deferred tax expense (income) relating to origination and reversal of temporary differences, unrecognized 2,492,915 R$ 9,432,484
Net asset (liability) 15,078,352 1,385,990
Annulment Action and Tax Enforcement related to IRPJ and CSLL (AXIA Energia)    
TAXES PAYABLE    
Other components of deferred tax expense (income) 2,178,305 2,060,752
Tax Enforcement and Objections to Tax Enforcement related to IRPJ and CSLL (AXIA Energia)    
TAXES PAYABLE    
Other components of deferred tax expense (income) 955,755 899,043
Ordinary Action to challenge IRPJ and CSLL on indemnification for early reversion of concession assets (AXIA Energia Sul)    
TAXES PAYABLE    
Other components of deferred tax expense (income) 938,232 836,218
Annulment Action related to IRPJ and CSLL (AXIA Energia Sul)    
TAXES PAYABLE    
Other components of deferred tax expense (income) 630,246 624,047
Tax Enforcement Action seeking collection of IRPJ and CSLL on amounts related to the early reversion of concession assets (AXIA Energia)    
TAXES PAYABLE    
Other components of deferred tax expense (income) 821,739 766,147
Tax Assessment Notice – IRPJ and CSLL (AXIA Energia)    
TAXES PAYABLE    
Other components of deferred tax expense (income) R$ 913,294 R$ 852,517