v3.25.4
INVESTMENTS - Disclosure of joint ventures (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of joint ventures      
Assets R$ 128,071,708 R$ 124,940,673  
Liabilities 59,068,982 55,141,178  
Equity 68,721,743 69,729,582  
Net operating revenue 59,595,000 55,845,048 R$ 52,100,151
Consolidated net income 6,177,543 5,557,332 R$ 5,039,977
Alianca Atlantica Holding B.V. ("Alianca")      
Disclosure of joint ventures      
Assets 301,512 297,309  
Liabilities 798 2,917  
Equity 300,714 294,392  
Consolidated net income 4,696 6,968  
Companhia AIX de Participações ("AIX")      
Disclosure of joint ventures      
Assets 60,180 49,834  
Liabilities 38,325 32,105  
Equity 21,855 17,729  
Net operating revenue 71,521 67,521  
Consolidated net income 4,126 (1,648)  
Companhia ACT de Participações ("ACT")      
Disclosure of joint ventures      
Assets 49 46  
Liabilities 6 4  
Equity 43 42  
Net operating revenue 104 96  
Consolidated net income 1    
GUD Comercializadora de Energia S.A. ("GUD")      
Disclosure of joint ventures      
Assets   23,460  
Liabilities   7,664  
Equity   15,796  
Net operating revenue 5,606    
Consolidated net income (3,169) (4,842)  
VivaE Educação Digital S.A. ("VIVAE")      
Disclosure of joint ventures      
Assets 37,864 21,070  
Liabilities 13,748 3,957  
Equity 24,116 17,113  
Net operating revenue 10,480 6,152  
Consolidated net income R$ (13,025) (5,307)  
FiBrasil Infraestrutura e Fibra Otica S.A. ("FiBrasil")      
Disclosure of joint ventures      
Assets   2,025,664  
Liabilities   1,157,880  
Equity   867,784  
Net operating revenue   391,831  
Consolidated net income   R$ (7,745)