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INTANGIBLE ASSETS - Movement in goodwill per cash-generating unit (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of changes in goodwill [abstract]    
Goodwill at beginning of period $ 2,682 $ 3,959
Impairment 0 (723)
Translation adjustment (62) (567)
Addition 14 13
Reclassification as held for sale (1,034)  
Disposal (51)  
Other (7)  
Goodwill at end of period 1,542 2,682
Russia    
Reconciliation of changes in goodwill [abstract]    
Goodwill at beginning of period 1,131 2,265
Impairment 0 (723)
Translation adjustment (10) (424)
Addition 14 13
Reclassification as held for sale 0  
Disposal (51)  
Other 0  
Goodwill at end of period 1,084 1,131
Algeria    
Reconciliation of changes in goodwill [abstract]    
Goodwill at beginning of period 1,053 1,167
Impairment 0 0
Translation adjustment (19) (114)
Addition 0 0
Reclassification as held for sale (1,034)  
Disposal 0  
Other 0  
Goodwill at end of period 0 1,053
Pakistan    
Reconciliation of changes in goodwill [abstract]    
Goodwill at beginning of period 324 335
Impairment 0 0
Translation adjustment (30) (11)
Addition 0 0
Reclassification as held for sale 0  
Disposal 0  
Other (7)  
Goodwill at end of period 287 324
Kazakhstan    
Reconciliation of changes in goodwill [abstract]    
Goodwill at beginning of period 140 154
Impairment 0 0
Translation adjustment (4) (14)
Addition 0 0
Reclassification as held for sale 0  
Disposal 0  
Other 0  
Goodwill at end of period 136 140
Uzbekistan    
Reconciliation of changes in goodwill [abstract]    
Goodwill at beginning of period 34 38
Impairment 0 0
Translation adjustment 1 (4)
Addition 0 0
Reclassification as held for sale 0  
Disposal 0  
Other 0  
Goodwill at end of period $ 35 $ 34