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CONDENSED SEPARATE FINANCIAL INFORMATION OF KYIVSTAR GROUP LTD. - Condensed Income Statement (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 14, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Condensed Income Statements, Captions [Line Items]        
Listing expense $ (162) $ (162) $ 0 $ 0
Operating profit   274 348 363
Profit / (loss) for the year   124 $ 283 $ 281
Kyivstar Group Ltd.        
Condensed Income Statements, Captions [Line Items]        
Other operating gains   (1)    
Listing expense   (162)    
Operating profit   (163)    
Finance costs   (5)    
Profit / (loss) for the year   $ (168)