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FINANCIAL INSTRUMENTS (Details 16)
R$ in Thousands
Dec. 31, 2024
BRL (R$)
shares
Dec. 31, 2023
BRL (R$)
shares
USIM 3 [Member]    
IfrsStatementLineItems [Line Items]    
Quantity (in shares) | shares 106,620,851 106,620,851
Share price 5.32 9.20
Closing Balance R$ 567,222 R$ 980,912
USIM 3 [Member] | Extreme Optimistic Scenario [Member]    
IfrsStatementLineItems [Line Items]    
Closing Balance 219,454  
USIM 3 [Member] | Extreme Pessimistic Scenario [Member]    
IfrsStatementLineItems [Line Items]    
Closing Balance R$ (35,258)  
USIM 5 [Member]    
IfrsStatementLineItems [Line Items]    
Quantity (in shares) | shares 55,144,456 55,144,456
Share price 5.32 9.29
Closing Balance R$ 293,369 R$ 512,292
USIM 5 [Member] | Extreme Optimistic Scenario [Member]    
IfrsStatementLineItems [Line Items]    
Closing Balance 108,868  
USIM 5 [Member] | Extreme Pessimistic Scenario [Member]    
IfrsStatementLineItems [Line Items]    
Closing Balance (20,930)  
Total USIM Shares [Member]    
IfrsStatementLineItems [Line Items]    
Closing Balance 860,591 R$ 1,493,204
Total USIM Shares [Member] | Extreme Optimistic Scenario [Member]    
IfrsStatementLineItems [Line Items]    
Closing Balance 328,322  
Total USIM Shares [Member] | Extreme Pessimistic Scenario [Member]    
IfrsStatementLineItems [Line Items]    
Closing Balance R$ (56,188)