v3.26.1
Balances and transactions with related parties (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]      
Total assets R$ 91,064 R$ 117,273  
Total liabilities 962,475 724,806  
Total revenue 25,285 20,826 R$ 36,572
Total costs/expenses 941,407 1,263,472 1,150,232
Telecom Italia Sparkle [Member]      
IfrsStatementLineItems [Line Items]      
Total assets 8,391 10,188  
Total liabilities 6,407 11,599  
Total revenue 3,706 5,939 3,980
Total costs/expenses 4,757 6,667 13,520
Gruppo Havas [Member]      
IfrsStatementLineItems [Line Items]      
Total assets 12,831  
T I Sparkle [Member]      
IfrsStatementLineItems [Line Items]      
Total assets 5 28  
Total liabilities 2,402 11,290  
Total revenue 273 339 911
Total costs/expenses 14,425 11,290 17,762
T I M Brasil [Member]      
IfrsStatementLineItems [Line Items]      
Total assets 23,183 23,260  
Total liabilities 10,858 10,858  
Telecom Italia S P A [Member]      
IfrsStatementLineItems [Line Items]      
Total assets 5,850 24,962  
Total liabilities 90,846 154,729  
Total revenue 19,007 11,352 4,366
Total costs/expenses 153,861 151,677 130,994
I-Systems [Member]      
IfrsStatementLineItems [Line Items]      
Total assets 53,538 45,907  
Total liabilities 56,027 58,613  
Total revenue 2,299 3,196 27,315
Total costs/expenses 458,550 452,931 429,771
Other related parties [member]      
IfrsStatementLineItems [Line Items]      
Total assets 97 97  
Total liabilities 4,138 3,865  
Total costs/expenses 33,127 26,994 18,445
Vivendi Group [Member]      
IfrsStatementLineItems [Line Items]      
Total liabilities 1,152  
Total costs/expenses 1,851 5,853 8,390
Grupo Havas [Member]      
IfrsStatementLineItems [Line Items]      
Total liabilities 104,757  
Total costs/expenses 274,836 608,060 R$ 531,350
T I M Brasil 1 [Member]      
IfrsStatementLineItems [Line Items]      
Total liabilities R$ 791,797 R$ 367,943