v3.25.4
Intangible Assets (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period R$ 48,261,647 R$ 48,962,975
Additions [1] 2,909,815 2,889,735
Write-offs, net   (4,242)
Net transfers [2] 1,298 35,058
Amortisation, intangible assets other than goodwill (3,950,187) (3,862,302)
Balance at end of the period 47,968,458 48,261,647
Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period 94,505,161  
Balance at end of the period 98,212,648 94,505,161
Accumulated depreciation and amortisation    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period (46,243,514)  
Balance at end of the period (50,244,190) (46,243,514)
IPNET Cloud Services and Systems Development Ltda.    
Disclosure of detailed information about intangible assets [line items]    
Business combination (1,658) (240,423)
FiBrasil Infraestrutura e Fibra Otica S.A. ("FiBrasil")    
Disclosure of detailed information about intangible assets [line items]    
Business combination (677,653)  
Telefonica Cibersegurana e Tecnologia Do Brasil    
Disclosure of detailed information about intangible assets [line items]    
Business combination (1,228)  
Samauma    
Disclosure of detailed information about intangible assets [line items]    
Business combination (65,346)  
Goodwill    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period [3] 26,565,135 26,390,696
Balance at end of the period [3] 27,236,854 26,565,135
Goodwill | Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period [3] 26,565,135  
Balance at end of the period [3] 27,236,854 26,565,135
Goodwill | Accumulated depreciation and amortisation    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period [3] 0  
Balance at end of the period [3] 0 0
Goodwill | IPNET Cloud Services and Systems Development Ltda.    
Disclosure of detailed information about intangible assets [line items]    
Business combination (1,960) (174,439) [3]
Goodwill | FiBrasil Infraestrutura e Fibra Otica S.A. ("FiBrasil")    
Disclosure of detailed information about intangible assets [line items]    
Business combination [3] (631,169)  
Goodwill | Samauma    
Disclosure of detailed information about intangible assets [line items]    
Business combination (38,590)  
Licenses    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period 13,595,254 14,887,059
Additions [1]   23,919
Amortisation, intangible assets other than goodwill (1,318,276) (1,315,724)
Balance at end of the period 12,276,978 13,595,254
Licenses | Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period 29,772,875  
Balance at end of the period 29,772,875 29,772,875
Licenses | Accumulated depreciation and amortisation    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period (16,177,621)  
Balance at end of the period (17,495,897) (16,177,621)
Computer software    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period 6,586,840 6,056,999
Additions [1] 52,185  
Write-offs, net   (3,592)
Net transfers [2] 2,895,510 2,874,907
Amortisation, intangible assets other than goodwill (2,476,810) (2,341,474)
Balance at end of the period 7,101,162 6,586,840
Computer software | Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period 30,772,551  
Balance at end of the period 33,811,189 30,772,551
Computer software | Accumulated depreciation and amortisation    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period (24,185,711)  
Balance at end of the period (26,710,027) (24,185,711)
Computer software | FiBrasil Infraestrutura e Fibra Otica S.A. ("FiBrasil")    
Disclosure of detailed information about intangible assets [line items]    
Business combination (42,203)  
Computer software | Telefonica Cibersegurana e Tecnologia Do Brasil    
Disclosure of detailed information about intangible assets [line items]    
Business combination (1,228)  
Computer software | Samauma    
Disclosure of detailed information about intangible assets [line items]    
Business combination (6)  
Brand    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period 496,172 571,902
Net transfers [2] (80)  
Amortisation, intangible assets other than goodwill (87,889) (85,829)
Balance at end of the period 414,108 496,172
Brand | Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period 1,673,846  
Balance at end of the period 1,679,752 1,673,846
Brand | Accumulated depreciation and amortisation    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period (1,177,674)  
Balance at end of the period (1,265,644) (1,177,674)
Brand | IPNET Cloud Services and Systems Development Ltda.    
Disclosure of detailed information about intangible assets [line items]    
Business combination   (10,099)
Brand | FiBrasil Infraestrutura e Fibra Otica S.A. ("FiBrasil")    
Disclosure of detailed information about intangible assets [line items]    
Business combination (445)  
Brand | Samauma    
Disclosure of detailed information about intangible assets [line items]    
Business combination (5,460)  
Customer-related intangible assets    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period 122,126 205,800
Net transfers [2] (102)  
Amortisation, intangible assets other than goodwill (53,770) (112,423)
Balance at end of the period 71,960 122,126
Customer-related intangible assets | Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period 4,577,691  
Balance at end of the period 4,583,991 4,577,691
Customer-related intangible assets | Accumulated depreciation and amortisation    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period (4,455,565)  
Balance at end of the period (4,512,031) (4,455,565)
Customer-related intangible assets | IPNET Cloud Services and Systems Development Ltda.    
Disclosure of detailed information about intangible assets [line items]    
Business combination (130) (28,749)
Customer-related intangible assets | FiBrasil Infraestrutura e Fibra Otica S.A. ("FiBrasil")    
Disclosure of detailed information about intangible assets [line items]    
Business combination (3,836)  
Other intangible assets    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period 68,305 48,021
Net transfers [2] (205)  
Amortisation, intangible assets other than goodwill (13,442) (6,852)
Balance at end of the period 75,776 68,305
Other intangible assets | Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period 315,248  
Balance at end of the period 336,367 315,248
Other intangible assets | Accumulated depreciation and amortisation    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period (246,943)  
Balance at end of the period (260,591) (246,943)
Other intangible assets | IPNET Cloud Services and Systems Development Ltda.    
Disclosure of detailed information about intangible assets [line items]    
Business combination (172) (27,136)
Other intangible assets | Samauma    
Disclosure of detailed information about intangible assets [line items]    
Business combination (21,290)  
Intangible assets under development    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period 827,815 802,498
Additions [1] 2,857,630 2,865,816
Write-offs, net   (650)
Net transfers [2] (2,893,825) (2,839,849)
Balance at end of the period 791,620 827,815
Intangible assets under development | Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period 827,815  
Balance at end of the period 791,620 827,815
Intangible assets under development | Accumulated depreciation and amortisation    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of the period 0  
Balance at end of the period R$ 0 R$ 0
[1] Licenses refer to the extension of authorization for the right to use radio frequencies for the operation of the SMP (Mobile Personal Service).
[2] Total balances refer to transfers between classes of property and equipment and intangible assets (Note 13.c.).
[3] efer to the operations of Santo Genovese Participações (2004); Spanish and Figueira (2006); Telefônica Televisão Participações (2008); Vivo Participações (2011); GVT Participações (2015), Garliava and Vita IT (2022), Vale Saúde Sempre (2023), IPNET (2024), Samauma and FiBrasil (2025).