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INTANGIBLE ASSETS - Movement in goodwill per cash-generating unit (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in goodwill [abstract]    
Goodwill at beginning of period $ 349 $ 394
Translation adjustment (17) (45)
Transfer and reclassification 6  
Goodwill at end of period 338 349
Pakistan    
Reconciliation of changes in goodwill [abstract]    
Goodwill at beginning of period 179 223
Translation adjustment 4 (44)
Transfer and reclassification 0  
Goodwill at end of period 183 179
Kazakhstan    
Reconciliation of changes in goodwill [abstract]    
Goodwill at beginning of period 129 127
Translation adjustment (17) 2
Transfer and reclassification 0  
Goodwill at end of period 112 129
Ukraine    
Reconciliation of changes in goodwill [abstract]    
Goodwill at beginning of period 10 10
Translation adjustment (2) 0
Transfer and reclassification 6  
Goodwill at end of period 14 10
Uzbekistan    
Reconciliation of changes in goodwill [abstract]    
Goodwill at beginning of period 31 34
Translation adjustment (2) (3)
Transfer and reclassification 0  
Goodwill at end of period 29 31
Bangladesh and Kyrgyzstan    
Reconciliation of changes in goodwill [abstract]    
Goodwill at beginning of period 0  
Goodwill at end of period $ 0 $ 0