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SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2022
SIGNIFICANT ACCOUNTING POLICIES    
Price of spectrum to be exchanged   $ 2,787.0
5G licenses    
SIGNIFICANT ACCOUNTING POLICIES    
Average period for amortization 20 years  
3G/4G licenses    
SIGNIFICANT ACCOUNTING POLICIES    
Average period for amortization 15 years  
Nucleo's licenses | Minimum    
SIGNIFICANT ACCOUNTING POLICIES    
Average period for amortization 5 years  
Nucleo's licenses | Maximum    
SIGNIFICANT ACCOUNTING POLICIES    
Average period for amortization 10 years  
Customer Relationship | Minimum    
SIGNIFICANT ACCOUNTING POLICIES    
Average period for amortization 5 years  
Customer Relationship | Maximum    
SIGNIFICANT ACCOUNTING POLICIES    
Average period for amortization 14 years  
Incremental Costs from the Acquisition of Contracts    
SIGNIFICANT ACCOUNTING POLICIES    
Average period for amortization 2 years  
Content activation    
SIGNIFICANT ACCOUNTING POLICIES    
Average period for amortization 2 years  
Internally generated software | Minimum    
SIGNIFICANT ACCOUNTING POLICIES    
Average period for amortization 5 years  
Internally generated software | Maximum    
SIGNIFICANT ACCOUNTING POLICIES    
Average period for amortization 10 years  
Other | Minimum    
SIGNIFICANT ACCOUNTING POLICIES    
Average period for amortization 2 years  
Other | Maximum    
SIGNIFICANT ACCOUNTING POLICIES    
Average period for amortization 28 years