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SIGNIFICANT TRANSACTIONS - Acquisition of Tabletki Group Narrative (Details) - Tabletki Group - Kyivstar Group Ltd. - USD ($)
$ in Millions
 5 Months Ended 6 Months Ended
Feb. 10, 2026
Jun. 30, 2026
Jun. 30, 2026
Disclosure of detailed information about business combination [line items]      
Percentage of voting equity interests acquired 100.00%    
Purchase consideration $ 161    
Customer-related intangible assets recognised as of acquisition date 61    
Intangible assets 79    
Technology-based intangible assets recognised as of acquisition date 6    
Trade and other receivables $ 1    
Revenue of acquiree since acquisition date   $ 13  
Profit (loss) of acquiree since acquisition date   $ 8  
Revenue of combined entity as if combination occurred at beginning of period     $ 16
Profit (loss) of combined entity as if combination occurred at beginning of period     10
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination     1
Consideration transferred, measurement adjustment     1
Customer-related intangible assets      
Disclosure of detailed information about business combination [line items]      
Useful life measured as period of time, intangible assets other than goodwill 12 years    
Trademark      
Disclosure of detailed information about business combination [line items]      
Useful life measured as period of time, intangible assets other than goodwill 10 years    
Intangible assets $ 12    
Software      
Disclosure of detailed information about business combination [line items]      
Useful life measured as period of time, intangible assets other than goodwill 7 years    
Intangible assets, measurement adjustment     $ 2