v3.25.4
INVESTMENTS - Direct equity interests in subsidiaries and jointly controlled companies (Details)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Terra Networks    
Disclosure of subsidiaries [line items]    
Ownership interest (as a percent) 100.00% 100.00%
Telefônica Transportes e Logística Ltda ("TGLog")    
Disclosure of subsidiaries [line items]    
Ownership interest (as a percent) 100.00% 100.00%
POP Internet Ltda ("POP")    
Disclosure of subsidiaries [line items]    
Ownership interest (as a percent) 100.00% 100.00%
Vivo Money I Credit Rights Investment Fund    
Disclosure of subsidiaries [line items]    
Ownership interest (as a percent) 100.00% 100.00%
Vivo Pay II Investment Fund in Credit Rights    
Disclosure of subsidiaries [line items]    
Ownership interest (as a percent)   100.00%
Vivo Money III Investment Fund in Credit Rights    
Disclosure of subsidiaries [line items]    
Ownership interest (as a percent) 100.00%  
Vivo Pay Holding Financeira Ltda ("Vivo Pay")    
Disclosure of subsidiaries [line items]    
Ownership interest (as a percent) 100.00% 100.00%
Vivo Ventures ("VV")    
Disclosure of subsidiaries [line items]    
Ownership interest (as a percent) 98.00% 98.00%
Telefônica Cloud e Tecnologia do Brasil ("CloudCo Brasil")    
Disclosure of subsidiaries [line items]    
Ownership interest (as a percent) 50.01% 50.01%
Telefônica IoT, Big Data e Tecnologia do Brasil S.A. (“IoTCo Brasil”)    
Disclosure of subsidiaries [line items]    
Ownership interest (as a percent)   50.01%
Aliança Atlântica Holding B.V. . ("Aliança")    
Disclosure of subsidiaries [line items]    
Ownership interest (as a percent) 50.00% 50.00%
Companhia AIX de Participações ("AIX")    
Disclosure of subsidiaries [line items]    
Ownership interest (as a percent) 50.00% 50.00%
Companhia ACT de Participações ("ACT")    
Disclosure of subsidiaries [line items]    
Ownership interest (as a percent) 50.00% 50.00%
VivaE Educação Digital S.A. ("VIVAE")    
Disclosure of subsidiaries [line items]    
Ownership interest (as a percent)   50.00%
GUD Comercializadora de Energia S.A. ("GUD")    
Disclosure of subsidiaries [line items]    
Ownership interest (as a percent) 50.00% 50.00%
FiBrasil Infraestrutura e Fibra Ótica S.A. (“FiBrasil”)    
Disclosure of subsidiaries [line items]    
Ownership interest (as a percent) 75.01% 25.01%