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IMPAIRMENT - Impairment losses (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Impairment losses        
Impairment loss   $ 66 $ 192 $ 245
Impairment loss allocated to current and non-current assets     204  
Additional impairment loss recorded during the period   15 30 150
Property and equipment        
Impairment losses        
Impairment loss   15 100 150
Impairment loss allocated to current and non-current assets     100  
Intangible assets        
Impairment losses        
Impairment loss     14  
Impairment loss allocated to current and non-current assets     14  
Goodwill        
Impairment losses        
Impairment loss   51 78 $ 95
Impairment loss allocated to current and non-current assets     78  
Other assets        
Impairment losses        
Impairment loss allocated to current and non-current assets     12  
Armenia        
Impairment losses        
Impairment loss $ 44 34    
Recoverable amounts based on a fair value less costs of disposal   105    
Post-tax discount rate 12.10%      
Armenia | Goodwill        
Impairment losses        
Impairment loss   34    
Georgia        
Impairment losses        
Impairment loss allocated to current and non-current assets     29  
Recoverable amounts based on a fair value less costs of disposal     $ 53  
Post-tax discount rate     10.30%  
Georgia | Property and equipment        
Impairment losses        
Impairment loss allocated to current and non-current assets     $ 16  
Georgia | Intangible assets        
Impairment losses        
Impairment loss allocated to current and non-current assets     13  
Kyrgyzstan        
Impairment losses        
Impairment loss   17    
Impairment loss allocated to current and non-current assets     49  
Recoverable amounts based on a fair value less costs of disposal   209 $ 219  
Post-tax discount rate     14.50%  
Kyrgyzstan | Goodwill        
Impairment losses        
Impairment loss   17    
Impairment loss allocated to current and non-current assets     $ 49  
Tajikistan        
Impairment losses        
Impairment loss allocated to current and non-current assets     88  
Tajikistan | Property and equipment        
Impairment losses        
Impairment loss allocated to current and non-current assets     54  
Tajikistan | Intangible assets        
Impairment losses        
Impairment loss allocated to current and non-current assets     1  
Tajikistan | Goodwill        
Impairment losses        
Impairment loss allocated to current and non-current assets     21  
Tajikistan | Other assets        
Impairment losses        
Impairment loss allocated to current and non-current assets     $ 12  
Ukraine        
Impairment losses        
Weighted average cost of capital 1.00%      
Impairment loss $ 51      
Post-tax discount rate 17.80%      
Post-tax discount rate in the period prior to the reporting period     20.40%  
Post-tax discount rate in two periods prior to the reporting period       27.10%
Others        
Impairment losses        
Impairment loss   15    
Impairment loss allocated to current and non-current assets     $ 38  
Others | Property and equipment        
Impairment losses        
Impairment loss   $ 15    
Impairment loss allocated to current and non-current assets     30  
Others | Goodwill        
Impairment losses        
Impairment loss allocated to current and non-current assets     $ 8