v3.25.4
PROVISIONS AND CONTINGENCIES - Labor provisions and contingencies (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 30, 2024
Disclosure of other provisions [line items]      
Provision for Universal Telecommunications Services Fund R$ 6,166,037 R$ 5,813,657  
Provision under Fund for Technological Development of Telecommunications 2,344,915 2,085,332  
Provision for Telecommunications Inspection Fund 2,485,622 2,088,810  
Collective consumerist and non-consumerist nature      
Disclosure of other provisions [line items]      
Civil proceedings of a non-consumer nature R$ 1,051,328 965,461  
Regulatory amnesty      
Disclosure of other provisions [line items]      
Discount related to renegociations     55.00%
Tax provisions      
Disclosure of other provisions [line items]      
Import duty (as a percent) 4.00%    
Increased import duty (as a percent) 0.28    
Possible losses – tax contingencies      
Disclosure of other provisions [line items]      
Increased import duty (as a percent) 0.11    
Tax(1)      
Disclosure of other provisions [line items]      
Other provision for probable losses R$ 2,105,071 2,022,987  
Federal 835,180 809,765  
State 496,594 466,590  
Municipal 132,899 136,995  
FUST 640,398 609,637  
Other provision for possible losses 51,086,071 40,850,071  
Federal 5,803,304 4,419,439  
State 33,477,423 25,760,365  
Municipal 808,770 682,468  
FUST, FUNTTEL and FISTEL 10,996,574 9,987,799  
Daily fine in case of noncompliance 10    
Regulatory      
Disclosure of other provisions [line items]      
Provisions 1,073,962 1,151,095  
Possible losses provisions 3,237,934 3,066,637  
Civil      
Disclosure of other provisions [line items]      
Provisions 1,434,665 1,411,141  
Possible losses provisions 1,815,801 2,000,926  
Civil | Quotas calculated on community telephone plans and expansion plans      
Disclosure of other provisions [line items]      
Relating to failure to supply services and/or products sold 133,322 152,109  
Civil | Failure to provide services and products sold      
Disclosure of other provisions [line items]      
Relating to failure to supply services and/or products sold 250,015 293,571  
Labor      
Disclosure of other provisions [line items]      
Provisions 978,552 935,541  
Possible losses provisions R$ 1,151,825 R$ 1,346,257